[Bug 95176] LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95176

--- Comment #1 from Calvin Walton <calvin.walton at kepstin.ca> ---
Created attachment 123311
  --> https://bugs.freedesktop.org/attachment.cgi?id=123311&action=edit
kernel-drm-debug-log

Here's a log with drm.debug=0xe

During this log, i set drm.debug to 0xe, then set i915.enable_psr to -1 (was
0). I then use the screen locker in GNOME to blank the screen; this causes the
display to turn off, and when I turn the display back on psr is enabled (I
checked i915_edp_psr_status before and after to verify this). The display then
blinks several times, while the log prints repeated lines like

[20345.092329] sasami kernel: [drm:drm_mode_addfb2] [FB:59]
[20345.203191] sasami kernel: [drm:drm_mode_addfb2] [FB:61]

>From watching the log live, I believe the blinks occurred between the line that
said '59' and the line that said '61', but it's hard to tell due to possible
buffering in systemd-journald.

Afterwards, I reset i915.enable_psr to 0 and set drm.debug back to 0.

If you want a complete log from boot with drm.debug enabled, let me know.

-- 
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20160427/8ab3e033/attachment-0001.html>