Intel_backlight does not work after updating from 5.10.89 to latest 5.15.17 (fwd from bugzilla)

Intel_backlight does not work after updating from 5.10.89 to latest 5.15.17 (fwd from bugzilla)

[Thorsten Leemhuis]

Hi, this is your Linux kernel regression tracker speaking.

There is a regression in bugzilla.kernel.org I'd like to add to the
tracking:

#regzbot introduced: v5.10.89..v5.15.17
#regzbot from:  Filippo Falezza <filippo.falezza@outlook.it>
#regzbot title: backlight: Intel_backlight does not work after updating
from 5.10.89 to latest 5.15.17
#regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215553

Quote:

> As per title, after updating the kernel from to the currently latest version available in Arch repositories, the intel_backlight class has stopped working.
> 
> This is still present under /sys/class/backlight, but any change to it does not affect backlight. The only change that can be made is by setting abcklight to 0,  which turns off the screen.
> 
> To keep a usable system, I had to roll-back to 5.10.89, the last known version to work properly.
> 
> I have tried changing the pwm of the screen, which does affect the backlight, dimming it in steps, but it seems that something major has been changed.
> I also tried to just roll back the linux-firmware package, with no success. From this, I concluded that the issue should be in the kernel.
> 
> Finally, I should say that I have noticed a change in the scale of intel_backlight, as maximum_backlight went from 120000 down to 512.
> 
> Thanks to anyone who will help me.
> 
> 
> Which files should I upload to start debugging?

Ciao, Thorsten

Re: Intel_backlight does not work after updating from 5.10.89 to latest 5.15.17 (fwd from bugzilla) #forregzbot

[Thorsten Leemhuis]

TWIMC: this mail is primarily send for documentation purposes and for
regzbot, my Linux kernel regression tracking bot. These mails usually
contain '#forregzbot' in the subject, to make them easy to spot and filter.

On 31.01.22 07:36, Thorsten Leemhuis wrote:
> Hi, this is your Linux kernel regression tracker speaking.
> 
> There is a regression in bugzilla.kernel.org I'd like to add to the
> tracking:
> 
> #regzbot introduced: v5.10.89..v5.15.17
> #regzbot from:  Filippo Falezza <filippo.falezza@outlook.it>
> #regzbot title: backlight: Intel_backlight does not work after updating
> from 5.10.89 to latest 5.15.17
> #regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215553

#regzbot link: https://gitlab.freedesktop.org/drm/intel/-/issues/5284
#regzbot ignore-activity

Ciao, Thorsten

Re: Intel_backlight does not work after updating from 5.10.89 to latest 5.15.17 (fwd from bugzilla) #forregzbot

[Thorsten Leemhuis]

On 24.03.22 15:51, Thorsten Leemhuis wrote:
> TWIMC: this mail is primarily send for documentation purposes and for
> regzbot, my Linux kernel regression tracking bot. These mails usually
> contain '#forregzbot' in the subject, to make them easy to spot and filter.
> 
> On 31.01.22 07:36, Thorsten Leemhuis wrote:
>> Hi, this is your Linux kernel regression tracker speaking.
>>
>> There is a regression in bugzilla.kernel.org I'd like to add to the
>> tracking:
>>
>> #regzbot introduced: v5.10.89..v5.15.17
>> #regzbot from:  Filippo Falezza <filippo.falezza@outlook.it>
>> #regzbot title: backlight: Intel_backlight does not work after updating
>> from 5.10.89 to latest 5.15.17
>> #regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215553
> 
> #regzbot link: https://gitlab.freedesktop.org/drm/intel/-/issues/5284
> #regzbot ignore-activity

#rebzbot fixed-by: b4b157577cb1de13

Re: Intel_backlight does not work after updating from 5.10.89 to latest 5.15.17 (fwd from bugzilla) #forregzbot

[Thorsten Leemhuis]

On 22.04.22 11:49, Thorsten Leemhuis wrote:
> On 24.03.22 15:51, Thorsten Leemhuis wrote:
>> TWIMC: this mail is primarily send for documentation purposes and for
>> regzbot, my Linux kernel regression tracking bot. These mails usually
>> contain '#forregzbot' in the subject, to make them easy to spot and filter.
>>
>> On 31.01.22 07:36, Thorsten Leemhuis wrote:
>>> Hi, this is your Linux kernel regression tracker speaking.
>>>
>>> There is a regression in bugzilla.kernel.org I'd like to add to the
>>> tracking:
>>>
>>> #regzbot introduced: v5.10.89..v5.15.17
>>> #regzbot from:  Filippo Falezza <filippo.falezza@outlook.it>
>>> #regzbot title: backlight: Intel_backlight does not work after updating
>>> from 5.10.89 to latest 5.15.17
>>> #regzbot link: https://bugzilla.kernel.org/show_bug.cgi?id=215553
>>
>> #regzbot link: https://gitlab.freedesktop.org/drm/intel/-/issues/5284
>> #regzbot ignore-activity
> 
> #rebzbot fixed-by: b4b157577cb1de13

Trying this again, without a typo:

#regzbot fixed-by: b4b157577cb1de13