No backlight since linux-4.2.4 - drivers/gpu/drm/radeon/atombios_encoders.c
Michel Dänzer
michel at daenzer.net
Mon Oct 26 19:36:58 PDT 2015
Michael, please keep the Cc: list intact.
On 26.10.2015 19:46, Michael Burian wrote:
> On 10/26/15 10:32, Michel Dänzer wrote:
>> On 25.10.2015 04:25, Michael Burian wrote:
>>>
>>> # first bad commit: [5a633828b4b2bef343826afcb0a70770c4911c55] drm/radeon: Restore LCD backlight level on resume (>= R5xx)
>>>
>>> Workaround 2:
>>>
>>> reverting this single commit 5a633828b4b2bef343826afcb0a70770c4911c55 fixes the problem in linux-stable[0]
>>> as well as mainline[1] 4.3.0-rc6-00277-g01815536
>>
>> Please provide the dmesg output from running with the attached debugging
>> patch.
>>
>
> [0] contains dmesg output with your patch applied (which fixes the backlight issue)
This is very surprising: The patch just adds some debugging output, it's
not supposed to have any functional effect. Also, I don't see any of the
debugging output added by the patch in
dmesg-4.3.0-rc7-00003-g85051e2-dirty-2015-10-26-11-00-41-radeon-bl-debug.
Are you sure that my patch was actually applied to the radeon driver
when generating that file? Did you update the initrd with the patched
radeon.ko?
> [1] contains dmesg output without your patch for comparison (resulting in a permanent black screen as before in rc6)
>
>
> [0]
> dmesg-4.3.0-rc7-00003-g85051e2-dirty-2015-10-26-11-00-41-radeon-bl-debug
>
> [1]
> dmesg-4.3.0-rc7-00003-g85051e2-2015-10-26-11-22-09
>
>
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
More information about the dri-devel
mailing list