Bug 95124

Summary: Blinking display with 4.6-rc*
Product: DRI Reporter: Steinar H. Gunderson <sgunderson>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: inform, intel-gfx-bugs, pinguin255
Version: XOrg git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: HSW i915 features:
Attachments:
Description Flags
dmesg from boot to the issue none

Description Steinar H. Gunderson 2016-04-25 08:44:14 UTC
Created attachment 123234 [details]
dmesg from boot to the issue

I have a Lenovo X240, which has Haswell integrated graphics. On upgrade from
4.5.0 to 4.6-rc1, I noticed an extremely irritating issue; about every
minute, the display shows black for a brief moment (perhaps one or two
frames), then reverts back to the correct display. There are no other ill
effects that I can see, in particular nothing in dmesg. I tried with 4.6-rc4,
and it has the same issue.

Attached is a dmesg log with drm.debug=14, as requested by email. It's taken right after the first blink.
Comment 1 Jani Nikula 2016-04-25 08:56:38 UTC
(In reply to Steinar H. Gunderson from comment #0)
> Created attachment 123234 [details]
> dmesg from boot to the issue

Did that cover the screen going black?
Comment 2 Steinar H. Gunderson 2016-04-25 09:23:15 UTC
Yes, it did. Note, it doesn't go permanently black, it just goes black for 1–2 frames and then back to normal again.
Comment 3 Jani Nikula 2016-04-25 10:20:59 UTC
Can you try drm-intel-nightly branch of http://cgit.freedesktop.org/drm-intel?
Comment 4 Steinar H. Gunderson 2016-04-26 20:33:41 UTC
Same issue in drm-intel-nightly.
Comment 5 Arnd Hannemann 2016-05-04 10:01:02 UTC
Hi, I'm also seeing this bug on my Lenovo T440s (also Haswell).
Also on upgrade from 4.5.0 to 4.6-rc*
Comment 6 Arnd Hannemann 2016-05-04 10:03:55 UTC
(In reply to Arnd Hannemann from comment #5)
> Hi, I'm also seeing this bug on my Lenovo T440s (also Haswell).
> Also on upgrade from 4.5.0 to 4.6-rc*

Maybe some more input:
- debug=14 shows nothing new in the log in the moment when the flickering occurs
- i have two other monitors connected via DP, which don't show the problem
- The integrated display is connected via eDP
Comment 7 Jani Nikula 2016-05-04 10:08:44 UTC
Possible dupe bug 95176.

Does i915.enable_psr=0 module parameter help?
Comment 8 Andreas Kloeckner 2016-05-11 15:16:14 UTC
Same issue on ThinkPad X250 (Broadwell), 4.6rc7.

Some videos:

https://tiker.net/tmp/TRIM_20160511_094241.mp4
https://tiker.net/tmp/VID_20160511_093909.mp4 (towards the end)
Comment 9 Steinar H. Gunderson 2016-05-14 16:54:49 UTC
It does not happen with i915.enable_psr=0.
Comment 10 dnord 2016-05-16 00:48:00 UTC
Should be duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=95176
Comment 11 Jani Nikula 2016-09-20 12:56:49 UTC
(In reply to dnord from comment #10)
> Should be duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=95176

Agreed.

*** This bug has been marked as a duplicate of bug 95176 ***

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