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Bug#885570: linux-image-4.9.0-4-amd64: display breakage with Intel HD Graphics 5500

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Package: linux-image-4.9.0-4-amd64
Version: 4.9.65-3+deb9u1
Severity: critical

Recently, I've been having problems using my Lenovo X1 Carbon notebook 
(type 20BS, I think it's known as 3rd gen X1 Carbon).

By using the keyboard, or (especially) touchpad, I am getting really bad 
rendering artifacts (or flickering, not sure what the correct term is) 
on both the internal and external displays, and the latter sometimes 
even disappears for a second or so. Disconnecting the external display 
would sometimes prolong the "usable" period, but eventually the machine 
would become completely unusable anyway.

I had experienced different versions of "unusable": in some cases, the 
PC would freeze completely, and in other cases the laptop display would 
go berserk.

I ruled out this being a hardware issue, because booting an older kernel 
(linux-image-4.9.0-3-amd64 version 4.9.30-2+deb9u5) actually gets rid of 
the problem. I was also not able to reproduce it after booting from 
Ubuntu 17.10 Live USB.

Looking at apt history, I only see two upgrades to 
linux-image-4.9.0-4-amd64 this December: from 4.9.51-1 to 4.9.65-3 on 
11th and from 4.9.65-3 to 4.9.65-3+deb9u1 on 27th, thus my guess is that 
this regression happened somewhere inbetween 4.9.51-1 and 4.9.65-3 (the 
second upgrade was just yesterday, but I'm pretty sure the issue had 
already manifested before that). Looking at the Debian changelog, it 
seems there was a bunch of drm/i915 changes in 4.9.65-1, so maybe these 
changes cause the problem?

I'm using X.org and Cinnamon environment, but I was easily able to 
reproduce the same issue with Gnome and Wayland.

Device info:

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 
(rev 09) (prog-if 00 [VGA controller])
	Subsystem: Lenovo HD Graphics 5500
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 48
	Region 0: Memory at e0000000 (64-bit, non-prefetchable) [size=16M]
	Region 2: Memory at c0000000 (64-bit, prefetchable) [size=512M]
	Region 4: I/O ports at 3000 [size=64]
	[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915



I can provide further information if necessary.

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Thread

Bug#885570: linux-image-4.9.0-4-amd64: display breakage with Intel HD Graphics 5500 Rimas Kudelis <rq@akl.lt> - 2017-12-28 08:50 +0100
  Bug#885570: Extra info Samuel Smith <leon36@gmail.com> - 2017-12-28 19:30 +0100
  Bug#885570: More info Dave <dboydee@gmail.com> - 2017-12-31 22:10 +0100
  Bug#885570: linux-image-4.9.0-5-amd64 Pierre Parent <pierre.parent@pparent.fr> - 2018-01-08 21:00 +0100
  Processed (with 1 error): Re: Bug#885570: Duplicate of 884061 ? "Debian Bug Tracking System" <owner@bugs.debian.org> - 2018-01-08 21:20 +0100
  Bug#885570: Duplicate of 884061 ? Yves-Alexis Perez <corsac@debian.org> - 2018-01-08 21:20 +0100
  Bug#885570: linux-image-4.9.0-5-amd64 Daniel Collier <daniel@collier.io> - 2018-01-18 02:40 +0100
  Bug#885570: After upgrade I can continue to reproduce this Andrew Latham <lathama@gmail.com> - 2018-02-11 20:40 +0100
  Bug#885570: After upgrade I can continue to reproduce this Andrew Latham <lathama@gmail.com> - 2018-02-11 21:20 +0100
    Bug#885570: After upgrade I can continue to reproduce this Andrew Latham <lathama@gmail.com> - 2018-02-11 21:30 +0100

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