Bug 172251 - Display Turns Off Permanently On Suspend - Intel GFX
Summary: Display Turns Off Permanently On Suspend - Intel GFX
Status: CLOSED INSUFFICIENT_DATA
Alias: None
Product: ACPI
Classification: Unclassified
Component: Power-Video (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Zhang Rui
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2016-09-19 19:30 UTC by Steven Stewart-Gallus
Modified: 2016-11-29 05:10 UTC (History)
2 users (show)

See Also:
Kernel Version: 4.7.4
Subsystem:
Regression: No
Bisected commit-id:


Attachments
My Hardware Configuration (13.38 KB, application/octet-stream)
2016-09-19 19:30 UTC, Steven Stewart-Gallus
Details

Description Steven Stewart-Gallus 2016-09-19 19:30:40 UTC
Created attachment 239211 [details]
My Hardware Configuration

When I use xbacklight to set the brightness to zero the display can't be turned on again until I reboot. The same problem also happens sometimes when the computer suspends.
Comment 1 Len Brown 2016-09-19 23:44:44 UTC
Please try the sysfs interface to control backlight
and report if it behaves differently than using xbacklight:

/sys/class/backlight/*/brightness
Comment 2 Steven Stewart-Gallus 2016-09-20 15:21:28 UTC
Changing the brightness to zero using the sysfs interface does not turn off the display (you can still very slightly see the GUI on the laptop screen) and the brightness can be set up and down again (using the sysfs interface) (bypassing my desktop stack and using sysf directly seems to screw with the desktop and make it stop working.) Is there a sysfs interface way to actually turn off the screen and not just the backlight?
Comment 3 Steven Stewart-Gallus 2016-09-20 15:24:10 UTC
NVM. This seems to be just a problem with the desktop stack where sometimes it can get into a state where it can't control the brightness.
Comment 4 Zhang Rui 2016-09-26 05:53:01 UTC
As backlight sysfs I/F works, the problem you have sounds like a graphics issue to me.
Please file a bug report at https://bugs.freedesktop.org/ instead.
Comment 5 Steven Stewart-Gallus 2016-10-08 17:29:01 UTC
So, I didn't make this clear but this is actually two problems that I originally thought were one. The first one is with the backlight and the second one is with the suspend and resume not working. When I suspend and the system resumes the display is completely off (not just the backlight.)
Comment 6 Zhang Rui 2016-10-10 01:35:32 UTC
(In reply to Steven Stewart-Gallus from comment #5)
> So, I didn't make this clear but this is actually two problems that I
> originally thought were one. The first one is with the backlight and the
> second one is with the suspend and resume not working. When I suspend and
> the system resumes the display is completely off (not just the backlight.)

is the system still alive after resuming?
if yes, this still sounds like a graphics issue to me.
Comment 7 Zhang Rui 2016-11-29 05:10:10 UTC
hmmm, bug closed as there is no response from the bug reporter.
Please feel free to
1. reopen it if the system is dead after resume
2. file a bug report at freedesktop if the system is still alive, but with a black screen.

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