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.
(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?
Yes, it did. Note, it doesn't go permanently black, it just goes black for 1–2 frames and then back to normal again.
Can you try drm-intel-nightly branch of http://cgit.freedesktop.org/drm-intel?
Same issue in drm-intel-nightly.
Hi, I'm also seeing this bug on my Lenovo T440s (also Haswell).
Also on upgrade from 4.5.0 to 4.6-rc*
(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
Possible dupe bug 95176.
Does i915.enable_psr=0 module parameter help?
Same issue on ThinkPad X250 (Broadwell), 4.6rc7.
https://tiker.net/tmp/VID_20160511_093909.mp4 (towards the end)
It does not happen with i915.enable_psr=0.
Should be duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=95176
(In reply to dnord from comment #10)
> Should be duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=95176
*** This bug has been marked as a duplicate of bug 95176 ***