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Re: Erratic fan speed and little control kernel 4.2

Started byPali Rohár <pali.rohar@gmail.com>
First post2015-12-04 10:20 +0100
Last post2015-12-09 23:30 +0100
Articles 3 — 2 participants

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  Re: Erratic fan speed and little control kernel 4.2 Pali Rohár <pali.rohar@gmail.com> - 2015-12-04 10:20 +0100
    Re: Erratic fan speed and little control kernel 4.2 Peter Saunderson <peteasa@gmail.com> - 2015-12-04 18:00 +0100
      Re: Erratic fan speed and little control kernel 4.2 Peter Saunderson <peteasa@gmail.com> - 2015-12-09 23:30 +0100

#1283667 — Re: Erratic fan speed and little control kernel 4.2

FromPali Rohár <pali.rohar@gmail.com>
Date2015-12-04 10:20 +0100
SubjectRe: Erratic fan speed and little control kernel 4.2
Message-ID<qBUH1-Lu-17@gated-at.bofh.it>
Hi Peter!

On Thursday 03 December 2015 20:26:51 Peter Saunderson wrote:
> Erratic fan speed and little control kernel 4.2
> 
> After upgrading to kernel 4.2 my CPU fan started speeding and slowing
> without good reason even when the PC is idle.
> 
> To stop erratic fan speed - reboot sometimes works.
> 
> This bug has been bisected to commit
> f989e55452c74b4f7b22c889b8ec9f1192aaeec4

There is very similar (or same) problem on desktop Dell Studio XPS 8100.
See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121

In your long email is missing one important information: DMI information
about your machine. Can you run dmidecode and send output?

You were able to bisect problematic commit, are you able to do some
additional test and debug root of this issue?

In my opinion problem is in some SMM call, but without commenting code
which calling it, step by step and testing is not possible to decide...

-- 
Pali Rohár
pali.rohar@gmail.com
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#1284017

FromPeter Saunderson <peteasa@gmail.com>
Date2015-12-04 18:00 +0100
Message-ID<qC1S9-5fB-3@gated-at.bofh.it>
In reply to#1283667
Hi Pali,

Yes I can compile the kernel, yes I can debug this if you can suggest 
possible fixes or kprintf that you would like added to get more information.

Sorry I missed the dmi info...

# dmidecode 2.12
SMBIOS 2.6 present.
45 structures occupying 1673 bytes.
Table at 0x000FCB40.

Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
     Vendor: Dell Inc.
     Version: A07
     Release Date: 11/13/2010
     Address: 0xE0000
     Runtime Size: 128 kB
     ROM Size: 8192 kB
     Characteristics:
         PCI is supported
         PNP is supported
         BIOS is upgradeable
         BIOS shadowing is allowed
         ESCD support is available
         Boot from CD is supported
         Selectable boot is supported
         BIOS ROM is socketed
         EDD is supported
         5.25"/1.2 MB floppy services are supported (int 13h)
         3.5"/720 kB floppy services are supported (int 13h)
         3.5"/2.88 MB floppy services are supported (int 13h)
         Print screen service is supported (int 5h)
         8042 keyboard services are supported (int 9h)
         Serial services are supported (int 14h)
         Printer services are supported (int 17h)
         CGA/mono video services are supported (int 10h)
         ACPI is supported
         USB legacy is supported
         LS-120 boot is supported
         ATAPI Zip drive boot is supported
         BIOS boot specification is supported
         Targeted content distribution is supported
     BIOS Revision: 8.15

Handle 0x0001, DMI type 1, 27 bytes
System Information
     Manufacturer: Dell Inc.
     Product Name: Inspiron 580
     Version: Not Specified
     Serial Number: GGBZZ4J
     UUID: 4C4C4544-0047-4210-805A-C7C04F5A344A
     Wake-up Type: Power Switch
     SKU Number:
     Family:

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
     Manufacturer: Dell Inc.
     Product Name: 0C2KJT
     Version: A00
     Serial Number: ..CN736040AD07D9.
     Asset Tag:
     Features:
         Board is a hosting board
         Board is replaceable
     Location In Chassis:
     Chassis Handle: 0x0003
     Type: Motherboard
     Contained Object Handles: 0

Handle 0x0003, DMI type 3, 21 bytes
Chassis Information
     Manufacturer: Dell Inc.
     Type: Desktop
     Lock: Not Present
     Version: Not Specified
     Serial Number: GGBZZ4J
     Asset Tag: Not Specified
     Boot-up State: Safe
     Power Supply State: Safe
     Thermal State: Safe
     Security Status: None
     OEM Information: 0x00000000
     Height: Unspecified
     Number Of Power Cords: 1
     Contained Elements: 0

Handle 0x0004, DMI type 4, 42 bytes
Processor Information
     Socket Designation: CPU 1
     Type: Central Processor
     Family: Other
     Manufacturer: Intel
     ID: E5 06 01 00 FF FB EB BF
     Version: Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
     Voltage: Unknown
     External Clock: 133 MHz
     Max Speed: 2800 MHz
     Current Speed: 2800 MHz
     Status: Populated, Enabled
     Upgrade: Other
     L1 Cache Handle: 0x0005
     L2 Cache Handle: 0x0006
     L3 Cache Handle: 0x0007
     Serial Number: To Be Filled By O.E.M.
     Asset Tag: To Be Filled By O.E.M.
     Part Number: To Be Filled By O.E.M.
     Core Count: 4
     Core Enabled: 4
     Thread Count: 4
     Characteristics:
         64-bit capable

Handle 0x0005, DMI type 7, 19 bytes
Cache Information
     Socket Designation: L1-Cache
     Configuration: Enabled, Not Socketed, Level 1
     Operational Mode: Write Through
     Location: Internal
     Installed Size: 256 kB
     Maximum Size: 256 kB
     Supported SRAM Types:
         Other
     Installed SRAM Type: Other
     Speed: Unknown
     Error Correction Type: Parity
     System Type: Instruction
     Associativity: 4-way Set-associative

Handle 0x0006, DMI type 7, 19 bytes
Cache Information
     Socket Designation: L2-Cache
     Configuration: Enabled, Not Socketed, Level 2
     Operational Mode: Write Through
     Location: Internal
     Installed Size: 1024 kB
     Maximum Size: 1024 kB
     Supported SRAM Types:
         Other
     Installed SRAM Type: Other
     Speed: Unknown
     Error Correction Type: Single-bit ECC
     System Type: Unified
     Associativity: 8-way Set-associative

Handle 0x0007, DMI type 7, 19 bytes
Cache Information
     Socket Designation: L3-Cache
     Configuration: Enabled, Not Socketed, Level 3
     Operational Mode: Write Back
     Location: Internal
     Installed Size: 8192 kB
     Maximum Size: 8192 kB
     Supported SRAM Types:
         Other
     Installed SRAM Type: Other
     Speed: Unknown
     Error Correction Type: Single-bit ECC
     System Type: Unified
     Associativity: 16-way Set-associative

Handle 0x0008, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: SATA-1
     Internal Connector Type: SAS/SATA Plug Receptacle
     External Reference Designator: SATA-1
     External Connector Type: SAS/SATA Plug Receptacle
     Port Type: SATA

Handle 0x0009, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: SATA-2
     Internal Connector Type: SAS/SATA Plug Receptacle
     External Reference Designator: SATA-2
     External Connector Type: SAS/SATA Plug Receptacle
     Port Type: SATA

Handle 0x000A, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: SATA-3
     Internal Connector Type: SAS/SATA Plug Receptacle
     External Reference Designator: SATA-3
     External Connector Type: SAS/SATA Plug Receptacle
     Port Type: SATA

Handle 0x000B, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: SATA-4
     Internal Connector Type: SAS/SATA Plug Receptacle
     External Reference Designator: SATA-4
     External Connector Type: SAS/SATA Plug Receptacle
     Port Type: SATA

Handle 0x000C, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB0
     External Connector Type: Other
     Port Type: USB

Handle 0x000D, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB1
     External Connector Type: Other
     Port Type: USB

Handle 0x000E, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB2
     External Connector Type: Other
     Port Type: USB

Handle 0x000F, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB3
     External Connector Type: Other
     Port Type: USB

Handle 0x0010, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB4
     External Connector Type: Other
     Port Type: USB

Handle 0x0011, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB5
     External Connector Type: Other
     Port Type: USB

Handle 0x0012, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB6
     External Connector Type: Other
     Port Type: USB

Handle 0x0013, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: USB7
     External Connector Type: Other
     Port Type: USB

Handle 0x0014, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: AUDIO
     External Connector Type: None
     Port Type: Audio Port

Handle 0x0015, DMI type 8, 9 bytes
Port Connector Information
     Internal Reference Designator: Null
     Internal Connector Type: None
     External Reference Designator: ETHERNET
     External Connector Type: RJ-45
     Port Type: Network Port

Handle 0x0016, DMI type 9, 17 bytes
System Slot Information
     Designation: PCI1
     Type: 32-bit PCI
     Current Usage: Available
     Length: Short
     ID: 1
     Characteristics:
         3.3 V is provided
         Opening is shared
         PME signal is supported

Handle 0x0017, DMI type 9, 17 bytes
System Slot Information
     Designation: PCIE1
     Type: x1 PCI Express
     Current Usage: Available
     Length: Short
     ID: 2
     Characteristics:
         3.3 V is provided
         Opening is shared
         PME signal is supported

Handle 0x0018, DMI type 9, 17 bytes
System Slot Information
     Designation: PCIE2
     Type: x1 PCI Express
     Current Usage: Available
     Length: Short
     ID: 3
     Characteristics:
         3.3 V is provided
         Opening is shared
         PME signal is supported

Handle 0x0019, DMI type 9, 17 bytes
System Slot Information
     Designation: PCIE3
     Type: x16 PCI Express
     Current Usage: In Use
     Length: Long
     ID: 4
     Characteristics:
         3.3 V is provided
         Opening is shared
         PME signal is supported

Handle 0x001A, DMI type 11, 5 bytes
OEM Strings
     String 1: www.dell.com

Handle 0x001B, DMI type 13, 22 bytes
BIOS Language Information
     Language Description Format: Long
     Installable Languages: 1
         en|US|iso8859-1
     Currently Installed Language: en|US|iso8859-1

Handle 0x001C, DMI type 16, 15 bytes
Physical Memory Array
     Location: System Board Or Motherboard
     Use: System Memory
     Error Correction Type: None
     Maximum Capacity: 16 GB
     Error Information Handle: Not Provided
     Number Of Devices: 4

Handle 0x001D, DMI type 19, 15 bytes
Memory Array Mapped Address
     Starting Address: 0x00000000000
     Ending Address: 0x001FFFFFFFF
     Range Size: 8 GB
     Physical Array Handle: 0x001C
     Partition Width: 4

Handle 0x001E, DMI type 17, 28 bytes
Memory Device
     Array Handle: 0x001C
     Error Information Handle: Not Provided
     Total Width: Unknown
     Data Width: 64 bits
     Size: 2048 MB
     Form Factor: DIMM
     Set: None
     Locator: DIMM1
     Bank Locator: Not Specified
     Type: Other
     Type Detail: Synchronous
     Speed: 1333 MHz
     Manufacturer: Samsung
     Serial Number: 960C658C
     Asset Tag: 000211
     Part Number: M378B5773CH0-CH9
     Rank: 1

Handle 0x001F, DMI type 20, 19 bytes
Memory Device Mapped Address
     Starting Address: 0x00000000000
     Ending Address: 0x0007FFFFFFF
     Range Size: 2 GB
     Physical Device Handle: 0x001E
     Memory Array Mapped Address Handle: 0x001D
     Partition Row Position: 1
     Interleaved Data Depth: 1

Handle 0x0020, DMI type 17, 28 bytes
Memory Device
     Array Handle: 0x001C
     Error Information Handle: Not Provided
     Total Width: Unknown
     Data Width: 64 bits
     Size: 2048 MB
     Form Factor: DIMM
     Set: None
     Locator: DIMM2
     Bank Locator: Not Specified
     Type: Other
     Type Detail: Synchronous
     Speed: 1333 MHz
     Manufacturer: Samsung
     Serial Number: 960C6590
     Asset Tag: 000211
     Part Number: M378B5773CH0-CH9
     Rank: 1

Handle 0x0021, DMI type 20, 19 bytes
Memory Device Mapped Address
     Starting Address: 0x00100000000
     Ending Address: 0x0017FFFFFFF
     Range Size: 2 GB
     Physical Device Handle: 0x0020
     Memory Array Mapped Address Handle: 0x001D
     Partition Row Position: 1
     Interleaved Data Depth: 1

Handle 0x0022, DMI type 17, 28 bytes
Memory Device
     Array Handle: 0x001C
     Error Information Handle: Not Provided
     Total Width: Unknown
     Data Width: 64 bits
     Size: 2048 MB
     Form Factor: DIMM
     Set: None
     Locator: DIMM3
     Bank Locator: Not Specified
     Type: Other
     Type Detail: Synchronous
     Speed: 1333 MHz
     Manufacturer: Samsung
     Serial Number: 960C658D
     Asset Tag: 000211
     Part Number: M378B5773CH0-CH9
     Rank: 1

Handle 0x0023, DMI type 20, 19 bytes
Memory Device Mapped Address
     Starting Address: 0x00080000000
     Ending Address: 0x000FFFFFFFF
     Range Size: 2 GB
     Physical Device Handle: 0x0022
     Memory Array Mapped Address Handle: 0x001D
     Partition Row Position: 1
     Interleaved Data Depth: 1

Handle 0x0024, DMI type 17, 28 bytes
Memory Device
     Array Handle: 0x001C
     Error Information Handle: Not Provided
     Total Width: Unknown
     Data Width: 64 bits
     Size: 2048 MB
     Form Factor: DIMM
     Set: None
     Locator: DIMM4
     Bank Locator: Not Specified
     Type: Other
     Type Detail: Synchronous
     Speed: 1333 MHz
     Manufacturer: Samsung
     Serial Number: 960C6589
     Asset Tag: 000211
     Part Number: M378B5773CH0-CH9
     Rank: 1

Handle 0x0025, DMI type 20, 19 bytes
Memory Device Mapped Address
     Starting Address: 0x00180000000
     Ending Address: 0x001FFFFFFFF
     Range Size: 2 GB
     Physical Device Handle: 0x0024
     Memory Array Mapped Address Handle: 0x001D
     Partition Row Position: 1
     Interleaved Data Depth: 1

Handle 0x0026, DMI type 32, 20 bytes
System Boot Information
     Status: No errors detected

Handle 0x0027, DMI type 41, 11 bytes
Onboard Device
     Reference Designation: To Be Filled By O.E.M.
     Type: Video
     Status: Enabled
     Type Instance: 0

Handle 0x0028, DMI type 41, 11 bytes
Onboard Device
     Reference Designation: To Be Filled By O.E.M.
     Type: SCSI Controller
     Status: Disabled
     Type Instance: 0

Handle 0x0029, DMI type 129, 8 bytes
OEM-specific Type
     Header and Data:
         81 08 29 00 01 01 02 01
     Strings:
         Intel_ASF
         Intel_ASF_001

Handle 0x002A, DMI type 208, 26 bytes
OEM-specific Type
     Header and Data:
         D0 1A 2A 00 02 01 FE 00 38 04 00 00 00 00 00 00
         00 00 00 00 00 00 00 00 00 00

Handle 0x002B, DMI type 131, 64 bytes
OEM-specific Type
     Header and Data:
         83 40 2B 00 37 00 00 00 00 00 00 00 00 00 00 00
         F8 00 08 3B FF FF FF FF 00 00 00 00 00 00 06 00
         B8 04 1F 00 00 00 00 00 C8 00 FF FF 00 00 00 00
         00 00 00 00 32 00 00 00 76 50 72 6F 00 00 00 00

Handle 0x002C, DMI type 127, 4 bytes
End Of Table




On 04/12/15 09:18, Pali Rohár wrote:
> Hi Peter!
>
> On Thursday 03 December 2015 20:26:51 Peter Saunderson wrote:
>> Erratic fan speed and little control kernel 4.2
>>
>> After upgrading to kernel 4.2 my CPU fan started speeding and slowing
>> without good reason even when the PC is idle.
>>
>> To stop erratic fan speed - reboot sometimes works.
>>
>> This bug has been bisected to commit
>> f989e55452c74b4f7b22c889b8ec9f1192aaeec4
> There is very similar (or same) problem on desktop Dell Studio XPS 8100.
> See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
>
> In your long email is missing one important information: DMI information
> about your machine. Can you run dmidecode and send output?
>
> You were able to bisect problematic commit, are you able to do some
> additional test and debug root of this issue?
>
> In my opinion problem is in some SMM call, but without commenting code
> which calling it, step by step and testing is not possible to decide...
>

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#1287936

FromPeter Saunderson <peteasa@gmail.com>
Date2015-12-09 23:30 +0100
Message-ID<qDVph-5UZ-29@gated-at.bofh.it>
In reply to#1284017
Hi Pali,

By the way I can now confirm that after several hours of use with the 
"good" kernel that the processor fan flares up.. once.. then goes back 
to normal speed.  So it is entirely possible that the kernel change that 
causes the Erratic fan behaviour has deep roots and that this commit is 
not necessarily the one that introduced the problem but more like the 
one that makes the problem very obvious!

Looking forward to working with you guys to fix this!

Peter.

On 04/12/15 16:50, Peter Saunderson wrote:
> Hi Pali,
>
> Yes I can compile the kernel, yes I can debug this if you can suggest 
> possible fixes or kprintf that you would like added to get more 
> information.
>
> Sorry I missed the dmi info...
>
> # dmidecode 2.12
> SMBIOS 2.6 present.
> 45 structures occupying 1673 bytes.
> Table at 0x000FCB40.
>
> Handle 0x0000, DMI type 0, 24 bytes
> BIOS Information
>     Vendor: Dell Inc.
>     Version: A07
>     Release Date: 11/13/2010
>     Address: 0xE0000
>     Runtime Size: 128 kB
>     ROM Size: 8192 kB
>     Characteristics:
>         PCI is supported
>         PNP is supported
>         BIOS is upgradeable
>         BIOS shadowing is allowed
>         ESCD support is available
>         Boot from CD is supported
>         Selectable boot is supported
>         BIOS ROM is socketed
>         EDD is supported
>         5.25"/1.2 MB floppy services are supported (int 13h)
>         3.5"/720 kB floppy services are supported (int 13h)
>         3.5"/2.88 MB floppy services are supported (int 13h)
>         Print screen service is supported (int 5h)
>         8042 keyboard services are supported (int 9h)
>         Serial services are supported (int 14h)
>         Printer services are supported (int 17h)
>         CGA/mono video services are supported (int 10h)
>         ACPI is supported
>         USB legacy is supported
>         LS-120 boot is supported
>         ATAPI Zip drive boot is supported
>         BIOS boot specification is supported
>         Targeted content distribution is supported
>     BIOS Revision: 8.15
>
> Handle 0x0001, DMI type 1, 27 bytes
> System Information
>     Manufacturer: Dell Inc.
>     Product Name: Inspiron 580
>     Version: Not Specified
>     Serial Number: GGBZZ4J
>     UUID: 4C4C4544-0047-4210-805A-C7C04F5A344A
>     Wake-up Type: Power Switch
>     SKU Number:
>     Family:
>
> Handle 0x0002, DMI type 2, 15 bytes
> Base Board Information
>     Manufacturer: Dell Inc.
>     Product Name: 0C2KJT
>     Version: A00
>     Serial Number: ..CN736040AD07D9.
>     Asset Tag:
>     Features:
>         Board is a hosting board
>         Board is replaceable
>     Location In Chassis:
>     Chassis Handle: 0x0003
>     Type: Motherboard
>     Contained Object Handles: 0
>
> Handle 0x0003, DMI type 3, 21 bytes
> Chassis Information
>     Manufacturer: Dell Inc.
>     Type: Desktop
>     Lock: Not Present
>     Version: Not Specified
>     Serial Number: GGBZZ4J
>     Asset Tag: Not Specified
>     Boot-up State: Safe
>     Power Supply State: Safe
>     Thermal State: Safe
>     Security Status: None
>     OEM Information: 0x00000000
>     Height: Unspecified
>     Number Of Power Cords: 1
>     Contained Elements: 0
>
> Handle 0x0004, DMI type 4, 42 bytes
> Processor Information
>     Socket Designation: CPU 1
>     Type: Central Processor
>     Family: Other
>     Manufacturer: Intel
>     ID: E5 06 01 00 FF FB EB BF
>     Version: Intel(R) Core(TM) i5 CPU         760  @ 2.80GHz
>     Voltage: Unknown
>     External Clock: 133 MHz
>     Max Speed: 2800 MHz
>     Current Speed: 2800 MHz
>     Status: Populated, Enabled
>     Upgrade: Other
>     L1 Cache Handle: 0x0005
>     L2 Cache Handle: 0x0006
>     L3 Cache Handle: 0x0007
>     Serial Number: To Be Filled By O.E.M.
>     Asset Tag: To Be Filled By O.E.M.
>     Part Number: To Be Filled By O.E.M.
>     Core Count: 4
>     Core Enabled: 4
>     Thread Count: 4
>     Characteristics:
>         64-bit capable
>
> Handle 0x0005, DMI type 7, 19 bytes
> Cache Information
>     Socket Designation: L1-Cache
>     Configuration: Enabled, Not Socketed, Level 1
>     Operational Mode: Write Through
>     Location: Internal
>     Installed Size: 256 kB
>     Maximum Size: 256 kB
>     Supported SRAM Types:
>         Other
>     Installed SRAM Type: Other
>     Speed: Unknown
>     Error Correction Type: Parity
>     System Type: Instruction
>     Associativity: 4-way Set-associative
>
> Handle 0x0006, DMI type 7, 19 bytes
> Cache Information
>     Socket Designation: L2-Cache
>     Configuration: Enabled, Not Socketed, Level 2
>     Operational Mode: Write Through
>     Location: Internal
>     Installed Size: 1024 kB
>     Maximum Size: 1024 kB
>     Supported SRAM Types:
>         Other
>     Installed SRAM Type: Other
>     Speed: Unknown
>     Error Correction Type: Single-bit ECC
>     System Type: Unified
>     Associativity: 8-way Set-associative
>
> Handle 0x0007, DMI type 7, 19 bytes
> Cache Information
>     Socket Designation: L3-Cache
>     Configuration: Enabled, Not Socketed, Level 3
>     Operational Mode: Write Back
>     Location: Internal
>     Installed Size: 8192 kB
>     Maximum Size: 8192 kB
>     Supported SRAM Types:
>         Other
>     Installed SRAM Type: Other
>     Speed: Unknown
>     Error Correction Type: Single-bit ECC
>     System Type: Unified
>     Associativity: 16-way Set-associative
>
> Handle 0x0008, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-1
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-1
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x0009, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-2
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-2
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x000A, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-3
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-3
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x000B, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: SATA-4
>     Internal Connector Type: SAS/SATA Plug Receptacle
>     External Reference Designator: SATA-4
>     External Connector Type: SAS/SATA Plug Receptacle
>     Port Type: SATA
>
> Handle 0x000C, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB0
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x000D, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB1
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x000E, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB2
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x000F, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB3
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0010, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB4
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0011, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB5
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0012, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB6
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0013, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: USB7
>     External Connector Type: Other
>     Port Type: USB
>
> Handle 0x0014, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: AUDIO
>     External Connector Type: None
>     Port Type: Audio Port
>
> Handle 0x0015, DMI type 8, 9 bytes
> Port Connector Information
>     Internal Reference Designator: Null
>     Internal Connector Type: None
>     External Reference Designator: ETHERNET
>     External Connector Type: RJ-45
>     Port Type: Network Port
>
> Handle 0x0016, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCI1
>     Type: 32-bit PCI
>     Current Usage: Available
>     Length: Short
>     ID: 1
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x0017, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCIE1
>     Type: x1 PCI Express
>     Current Usage: Available
>     Length: Short
>     ID: 2
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x0018, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCIE2
>     Type: x1 PCI Express
>     Current Usage: Available
>     Length: Short
>     ID: 3
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x0019, DMI type 9, 17 bytes
> System Slot Information
>     Designation: PCIE3
>     Type: x16 PCI Express
>     Current Usage: In Use
>     Length: Long
>     ID: 4
>     Characteristics:
>         3.3 V is provided
>         Opening is shared
>         PME signal is supported
>
> Handle 0x001A, DMI type 11, 5 bytes
> OEM Strings
>     String 1: www.dell.com
>
> Handle 0x001B, DMI type 13, 22 bytes
> BIOS Language Information
>     Language Description Format: Long
>     Installable Languages: 1
>         en|US|iso8859-1
>     Currently Installed Language: en|US|iso8859-1
>
> Handle 0x001C, DMI type 16, 15 bytes
> Physical Memory Array
>     Location: System Board Or Motherboard
>     Use: System Memory
>     Error Correction Type: None
>     Maximum Capacity: 16 GB
>     Error Information Handle: Not Provided
>     Number Of Devices: 4
>
> Handle 0x001D, DMI type 19, 15 bytes
> Memory Array Mapped Address
>     Starting Address: 0x00000000000
>     Ending Address: 0x001FFFFFFFF
>     Range Size: 8 GB
>     Physical Array Handle: 0x001C
>     Partition Width: 4
>
> Handle 0x001E, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM1
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C658C
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x001F, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00000000000
>     Ending Address: 0x0007FFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x001E
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0020, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM2
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C6590
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x0021, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00100000000
>     Ending Address: 0x0017FFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x0020
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0022, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM3
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C658D
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x0023, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00080000000
>     Ending Address: 0x000FFFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x0022
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0024, DMI type 17, 28 bytes
> Memory Device
>     Array Handle: 0x001C
>     Error Information Handle: Not Provided
>     Total Width: Unknown
>     Data Width: 64 bits
>     Size: 2048 MB
>     Form Factor: DIMM
>     Set: None
>     Locator: DIMM4
>     Bank Locator: Not Specified
>     Type: Other
>     Type Detail: Synchronous
>     Speed: 1333 MHz
>     Manufacturer: Samsung
>     Serial Number: 960C6589
>     Asset Tag: 000211
>     Part Number: M378B5773CH0-CH9
>     Rank: 1
>
> Handle 0x0025, DMI type 20, 19 bytes
> Memory Device Mapped Address
>     Starting Address: 0x00180000000
>     Ending Address: 0x001FFFFFFFF
>     Range Size: 2 GB
>     Physical Device Handle: 0x0024
>     Memory Array Mapped Address Handle: 0x001D
>     Partition Row Position: 1
>     Interleaved Data Depth: 1
>
> Handle 0x0026, DMI type 32, 20 bytes
> System Boot Information
>     Status: No errors detected
>
> Handle 0x0027, DMI type 41, 11 bytes
> Onboard Device
>     Reference Designation: To Be Filled By O.E.M.
>     Type: Video
>     Status: Enabled
>     Type Instance: 0
>
> Handle 0x0028, DMI type 41, 11 bytes
> Onboard Device
>     Reference Designation: To Be Filled By O.E.M.
>     Type: SCSI Controller
>     Status: Disabled
>     Type Instance: 0
>
> Handle 0x0029, DMI type 129, 8 bytes
> OEM-specific Type
>     Header and Data:
>         81 08 29 00 01 01 02 01
>     Strings:
>         Intel_ASF
>         Intel_ASF_001
>
> Handle 0x002A, DMI type 208, 26 bytes
> OEM-specific Type
>     Header and Data:
>         D0 1A 2A 00 02 01 FE 00 38 04 00 00 00 00 00 00
>         00 00 00 00 00 00 00 00 00 00
>
> Handle 0x002B, DMI type 131, 64 bytes
> OEM-specific Type
>     Header and Data:
>         83 40 2B 00 37 00 00 00 00 00 00 00 00 00 00 00
>         F8 00 08 3B FF FF FF FF 00 00 00 00 00 00 06 00
>         B8 04 1F 00 00 00 00 00 C8 00 FF FF 00 00 00 00
>         00 00 00 00 32 00 00 00 76 50 72 6F 00 00 00 00
>
> Handle 0x002C, DMI type 127, 4 bytes
> End Of Table
>
>
>
>
> On 04/12/15 09:18, Pali Rohár wrote:
>> Hi Peter!
>>
>> On Thursday 03 December 2015 20:26:51 Peter Saunderson wrote:
>>> Erratic fan speed and little control kernel 4.2
>>>
>>> After upgrading to kernel 4.2 my CPU fan started speeding and slowing
>>> without good reason even when the PC is idle.
>>>
>>> To stop erratic fan speed - reboot sometimes works.
>>>
>>> This bug has been bisected to commit
>>> f989e55452c74b4f7b22c889b8ec9f1192aaeec4
>> There is very similar (or same) problem on desktop Dell Studio XPS 8100.
>> See bug: https://bugzilla.kernel.org/show_bug.cgi?id=100121
>>
>> In your long email is missing one important information: DMI information
>> about your machine. Can you run dmidecode and send output?
>>
>> You were able to bisect problematic commit, are you able to do some
>> additional test and debug root of this issue?
>>
>> In my opinion problem is in some SMM call, but without commenting code
>> which calling it, step by step and testing is not possible to decide...
>>
>

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