From: "Michel Dänzer" <michel@daenzer.net>
To: Michael Burian <michael.burian@sbg.at>
Cc: "dri-devel@lists.freedesktop.org" <dri-devel@lists.freedesktop.org>
Subject: Re: No backlight since linux-4.2.4 - drivers/gpu/drm/radeon/atombios_encoders.c
Date: Tue, 27 Oct 2015 11:36:58 +0900 [thread overview]
Message-ID: <562EE34A.9070100@daenzer.net> (raw)
In-Reply-To: <562E0473.5060404@sbg.at>
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
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next prev parent reply other threads:[~2015-10-27 2:37 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <562BDB47.5000301@sbg.at>
2015-10-26 9:32 ` No backlight since linux-4.2.4 - drivers/gpu/drm/radeon/atombios_encoders.c Michel Dänzer
2015-10-26 21:21 ` Alex Deucher
[not found] ` <562E0473.5060404@sbg.at>
2015-10-27 2:36 ` Michel Dänzer [this message]
2015-10-27 8:44 ` Michael Burian
2015-10-27 9:17 ` Michel Dänzer
2015-10-27 10:06 ` Michael Burian
2015-10-27 15:10 ` Alex Deucher
2015-10-27 16:23 ` Michael Burian
2015-10-27 16:43 ` Alex Deucher
2015-10-27 17:02 ` Michael Burian
2015-10-28 7:11 ` Michel Dänzer
2015-10-28 19:03 ` Alex Deucher
2015-10-28 20:46 ` Michael Burian
2015-10-29 3:18 ` Michel Dänzer
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