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[i915/drm error] Cannot control brightness

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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

#228968 — [i915/drm error] Cannot control brightness

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Hello, the brightness doesn't work (cursor moves but not real brightness). Could you please help or at least forward to the relevant member ? Thank you very much for your kind help. 
Error message :Some messages appear during boot (after grub) :

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/). Summary of this patch is below : 
"drivers/acpi/acpi_lpss.c and/or driver/mfd/intel_soc_pmic_core.c 
registers a pwm with the generic name "pwm_backlight" and then 
the i915 panel code makes a pwm_get(dev, "pwm_backlight"). 

Some devices use a PMIC Crystal Cove, but the LCD screen is connected to 
the PWM SoC/LPSS controller (and the VBT indicates it correctly), 
so here the heuristics in drivers/acpi/acpi_lpss.c and mfd/intel_soc_pmic_core.c fail.

This series of patches renames the PWM consultations recorded by the 
LPSS / intel_soc_pmic_core.c code from "pwm_backlight" to 
"pwm_soc_backlight" resp. "pwm_pmic_backlight" and, in the case of LPSS, 
also removes the heuristic. This, combined with teaching the 
i915 panel to call pwm_get for the right search name according to the 
bits of the VBT, solves this problem."

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#229130

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Hello, I understand you may be busy, however, could you please confirm you have received my request or give me a link to a tracking ticket ? 

Sorry for disturbing, and thank you very much

--


Nov 23, 2020, 16:06 by prog-amateur@tutamail.com:

> Hello, the brightness doesn't work (cursor moves but not real brightness). Could you please help or at least forward to the relevant member ? Thank you very much for your kind help. 
> Error message>  :Some messages appear during boot (after grub) :
>
> 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/> ). Summary of this patch is below : 
> "drivers/acpi/acpi_lpss.c and/or driver/mfd/intel_soc_pmic_core.c 
> registers a pwm with the generic name "pwm_backlight" and then 
> the i915 panel code makes a pwm_get(dev, "pwm_backlight"). 
>
> Some devices use a PMIC Crystal Cove, but the LCD screen is connected to 
> the PWM SoC/LPSS controller (and the VBT indicates it correctly), 
> so here the heuristics in drivers/acpi/acpi_lpss.c and mfd/intel_soc_pmic_core.c fail.
>
> This series of patches renames the PWM consultations recorded by the 
> LPSS / intel_soc_pmic_core.c code from "pwm_backlight" to 
> "pwm_soc_backlight" resp. "pwm_pmic_backlight" and, in the case of LPSS, 
> also removes the heuristic. This, combined with teaching the 
> i915 panel to call pwm_get for the right search name according to the 
> bits of the VBT, solves this problem."
>

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#229131

prog-amateur@tutamail.com wrote: 
> Hello, I understand you may be busy, however, could you please confirm you have received my request or give me a link to a tracking ticket ? 


No. debian-user is a mailing list for users to help each other.
There's no ticketing system associated, because there are no
guarantees.

(If you report a bug, that should be done in the Debian bug
tracking system.)

Insofar as proof that you have sent email, you could check the
list archives.

If you need help and are willing to pay for it, there are
various non-Debian consultants and companies who offer that as a
service.

-dsr-

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#229137

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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