Re: [i915/drm error] Cannot control brightness

From	didier gaumet <didier.gaumet@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: [i915/drm error] Cannot control brightness
Date	2020-11-27 20:30 +0100
Message-ID	<BfRBp-5tN-3@gated-at.bofh.it> (permalink)
References	<BemSZ-8bL-3@gated-at.bofh.it> <BfMim-2ce-13@gated-at.bofh.it> <BfRBp-5tN-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Le vendredi 27 novembre 2020 à 14:50:06 UTC+1, prog-a...@tutamail.com a écrit :
[...]
> Hello, the brightness doesn't work (cursor moves but not real brightness). 
[...]
> i915 0000:00:02.0 : [drm] *ERROR* Failed to get the PMIC PWM chip
> i915 0000:00:02.0 : [drm] *ERROR* [CRTC:51:pipe A] mismatch in pixel_rate
> i915 0000:00:02.0 : [drm] *ERROR* [CRTC:51:pipe A] mismatch in hw_adjusted_mode.crtc_clock
> i915 0000:00:02.0 : [drm] *ERROR* [CRTC:51:pipe A] mismatch in port_clock
> 
> Information about device and version : 
> My device is an HP Pro Tablet 608 (CPU : Intel Atom X5-Z8500, 64 bits, RAM : 4GB)
> I am using Debian Testing GNU/Linux 5.9 (but this bug appears also in 5.8, and Stable version), kernel 5.9.0-1-amd64, GNOME 3.38.1 under Wayland.
> Possible solution after test with Fedora (GNOME/Wayland/similar kernel) :
> Brightness can be controlled fine. It seems that this bug has been already fixed in Fedora with patches (c.f. : https://patchwork.freedesktop.org/series/69686/). 
[...]

Hello,

This could be caused by the firmware-misc-nonfree package being not installed.
 https://wiki.debian.org/Firmware?highlight=%28i915%29 (i915 section)
Albeit Fedora/RedHat/Centos are dedicated to free (as in speech) software by default, as is Debian, the formers consider non-free firmwares mandatory for a usable distribution ans thus provide it by default while the latter does not (policy difference).

(I am almost certain the above mentioned patch is present in Debian Testing)

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[i915/drm error] Cannot control brightness prog-amateur@tutamail.com - 2020-11-23 17:30 +0100
  Re: [i915/drm error] Cannot control brightness prog-amateur@tutamail.com - 2020-11-27 14:50 +0100
    Re: [i915/drm error] Cannot control brightness Dan Ritter <dsr@randomstring.org> - 2020-11-27 15:00 +0100
    Re: [i915/drm error] Cannot control brightness didier gaumet <didier.gaumet@gmail.com> - 2020-11-27 20:30 +0100

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