* [drm] 3.18 regression: backlight dark after resume
@ 2014-11-01 13:41 Ortwin Glück
2014-11-03 10:34 ` Jani Nikula
0 siblings, 1 reply; 3+ messages in thread
From: Ortwin Glück @ 2014-11-01 13:41 UTC (permalink / raw)
To: linux-kernel, Jani Nikula
Hi,
Since 3.18-rc1 backlight is dark after resume from suspend. This is on a Samsung
laptop with i5 IvyBridge
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
I have bisected this problem to the following commit:
73580fb764c4213d305c0d36bd8f856ae631eb42 is the first bad commit
commit 73580fb764c4213d305c0d36bd8f856ae631eb42
Author: Jani Nikula <jani.nikula@intel.com>
Date: Tue Aug 12 17:11:41 2014 +0300
drm/i915/dp: make backlight bl_power control power sequencer backlight
This lets the userspace switch off the backlight using the backlight
class sysfs bl_power file. The switch is done using the power sequencer;
the backlight PWM, and everything else, remains enabled. The display
backlight won't draw power, but for maximum power savings the encoder
needs to be switched off.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Tested_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Thanks,
Ortwin
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [drm] 3.18 regression: backlight dark after resume
2014-11-01 13:41 [drm] 3.18 regression: backlight dark after resume Ortwin Glück
@ 2014-11-03 10:34 ` Jani Nikula
0 siblings, 0 replies; 3+ messages in thread
From: Jani Nikula @ 2014-11-03 10:34 UTC (permalink / raw)
To: Ortwin Glück, linux-kernel, intel-gfx
On Sat, 01 Nov 2014, Ortwin Glück <odi@odi.ch> wrote:
> Hi,
>
> Since 3.18-rc1 backlight is dark after resume from suspend. This is on a Samsung
> laptop with i5 IvyBridge
>
> 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
> Graphics Controller (rev 09)
>
>
> I have bisected this problem to the following commit:
> 73580fb764c4213d305c0d36bd8f856ae631eb42 is the first bad commit
> commit 73580fb764c4213d305c0d36bd8f856ae631eb42
> Author: Jani Nikula <jani.nikula@intel.com>
> Date: Tue Aug 12 17:11:41 2014 +0300
>
> drm/i915/dp: make backlight bl_power control power sequencer backlight
>
> This lets the userspace switch off the backlight using the backlight
> class sysfs bl_power file. The switch is done using the power sequencer;
> the backlight PWM, and everything else, remains enabled. The display
> backlight won't draw power, but for maximum power savings the encoder
> needs to be switched off.
>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
> Tested_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
See https://bugs.freedesktop.org/show_bug.cgi?id=80773 (please ignore
comments up to #10 or so).
Please attach dmesg with drm.debug=14 module parameter set, from boot to
suspend/resume and the problem, running the debug patch from comment
#18. Preferrably please attach the dmesg on the bug to keep everything
in one place.
Thanks,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [drm] 3.18 regression: backlight dark after resume
@ 2014-11-03 10:34 ` Jani Nikula
0 siblings, 0 replies; 3+ messages in thread
From: Jani Nikula @ 2014-11-03 10:34 UTC (permalink / raw)
To: Ortwin Glück, linux-kernel, intel-gfx
On Sat, 01 Nov 2014, Ortwin Glück <odi@odi.ch> wrote:
> Hi,
>
> Since 3.18-rc1 backlight is dark after resume from suspend. This is on a Samsung
> laptop with i5 IvyBridge
>
> 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
> Graphics Controller (rev 09)
>
>
> I have bisected this problem to the following commit:
> 73580fb764c4213d305c0d36bd8f856ae631eb42 is the first bad commit
> commit 73580fb764c4213d305c0d36bd8f856ae631eb42
> Author: Jani Nikula <jani.nikula@intel.com>
> Date: Tue Aug 12 17:11:41 2014 +0300
>
> drm/i915/dp: make backlight bl_power control power sequencer backlight
>
> This lets the userspace switch off the backlight using the backlight
> class sysfs bl_power file. The switch is done using the power sequencer;
> the backlight PWM, and everything else, remains enabled. The display
> backlight won't draw power, but for maximum power savings the encoder
> needs to be switched off.
>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> Reviewed_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
> Tested_by: Clinton Taylor <Clinton.A.Taylor@intel.com>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
See https://bugs.freedesktop.org/show_bug.cgi?id=80773 (please ignore
comments up to #10 or so).
Please attach dmesg with drm.debug=14 module parameter set, from boot to
suspend/resume and the problem, running the debug patch from comment
#18. Preferrably please attach the dmesg on the bug to keep everything
in one place.
Thanks,
Jani.
--
Jani Nikula, Intel Open Source Technology Center
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/intel-gfx
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-11-03 10:34 ` Jani Nikula
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