Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.user > #225220 > unrolled thread

Looking for advise about optional i915 DMC firmware

Back to article view | Back to linux.debian.user

Contents

  Looking for advise about optional i915 DMC firmware "Thomas Schmitt" <scdbackup@gmx.net> - 2020-07-24 21:20 +0200
    Re: Looking for advise about optional i915 DMC firmware Dan Ritter <dsr@randomstring.org> - 2020-07-24 21:30 +0200
      [SOLVED] Re: Looking for advise about optional i915 DMC firmware "Thomas Schmitt" <scdbackup@gmx.net> - 2020-07-25 17:00 +0200

#225220 — Looking for advise about optional i915 DMC firmware

Hi,

my new computer reports at boot time that some graphics firmware is
missing:

[    1.158505] i915 0000:00:02.0: firmware: failed to load i915/kbl_dmc_ver1_04.bin (-2)
[    1.158507] firmware_class: See https://wiki.debian.org/Firmware for information about missing firmware
[    1.158508] i915 0000:00:02.0: Direct firmware load for i915/kbl_dmc_ver1_04.bin failed with error -2
[    1.158509] i915 0000:00:02.0: Failed to load DMC firmware i915/kbl_dmc_ver1_04.bin. Disabling runtime power management.
[    1.158510] i915 0000:00:02.0: DMC firmware homepage: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915

LXDE works despite these messages.
The web says that DMC is about power saving in Intel graphics.
  https://01.org/linuxgraphics/downloads/firmware
  "DMC provides additional graphics low-power idle states. It provides
   capability to save and restore display registers across these
   low-power states independently from the OS/Kernel."

The desired firmware file seems to be indeed available at
  https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/tree/i915/kbl_dmc_ver1_04.bin
but the given Debian wiki page is refering to Debian 8 as newest and
also i cannot find a tangible hint how to install such firmware after the
initial installation was already done (from netinst).

My questions:
- How desirable or undesirable is to install this particular firmware ?
- If i decide to do it: how to proceed ?


Have a nice day :)

Thomas

[toc] | [next] | [standalone]

#225221

Thomas Schmitt wrote: 
> - How desirable or undesirable is to install this particular firmware ?

If you're on a laptop, you probably want this. It enables
certain special very short sleep modes to save extra power.

On a server or desktop, you don't care. Servers reduce power by
themselves and desktops sleep when you step away long enough.

-dsr-

[toc] | [prev] | [next] | [standalone]

#225249 — [SOLVED] Re: Looking for advise about optional i915 DMC firmware

Hi,

Greg Wooledge wrote:
> 1) enable contrib and non-free in sources.list
> 2) apt-get update
> 3) figure out which firmware package is needed, and install it
> [...]
> apt-get install firmware-misc-nonfree

This silenced indeed the boot message about the missing firmware.


Dan Ritter wrote:
> On a server or desktop, you don't care. Servers reduce power by
> themselves and desktops sleep when you step away long enough.

It's a mix of server and desktop.

I decided to install the firmware because each boot reports an ACPI BERT
error record which was written by some firmware during the previous
uptime (or at its very end).
Regrettably the message did not vanish and leaves me clueless what
firmware wanted to report what problem.


Thanks for the help.


Have a nice day :)

Thomas

[toc] | [prev] | [standalone]

Back to top | Article view | linux.debian.user

csiph-web