Bug 105571

Summary:	eDP PSR leads to black screen on Asus UX305FA (Core M 5Y10)
Product:	Drivers	Reporter:	tobias.polzer+kernelbugtracker
Component:	Video(DRI - Intel)	Assignee:	intel-gfx-bugs (intel-gfx-bugs)
Status:	RESOLVED INVALID
Severity:	normal	CC:	intel-gfx-bugs, tobias.polzer+kernelbugtracker
Priority:	P1
Hardware:	Intel
OS:	Linux
Kernel Version:	4.3-rc4	Subsystem:
Regression:	No	Bisected commit-id:

Description tobias.polzer+kernelbugtracker 2015-10-06 11:23:58 UTC

When forcing eDP panel self refresh via 'i915.enable_psr=1' it starts working, but after switching screen resolution, the screen is only visible for a about 1 second, then it becomes black (backlight still on).
The only way I have found to get it back to working again without a reboot is standby. This works most of the time, but sometimes (~20%) of the times waking up from standby has the same effect.
This is not a new bug, it has been this way ever since PSR started working at all on that hardware.
Is there anything I can do to help debug this problem?

Comment 1 Jani Nikula 2015-10-06 13:55:54 UTC

PSR is still disabled by default. In current drm-intel-nightly we've started tainting the kernel when debug options like i915.enable_psr are enabled. If you enable things and something breaks, you're on your own. Sorry.

That said, maybe you can try drm-intel-nightly branch from [1], IIRC there's some PSR stuff there that's not in v4.3 yet.

[1] http://cgit.freedesktop.org/drm-intel

Comment 2 tobias.polzer+kernelbugtracker 2015-10-06 18:30:56 UTC

Just built drm-intel-nightly, and unfortunately it does not solve the problem.