[Bug 99087] New: Screen flickers - probably double buffered. [regresion]

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99087

            Bug ID: 99087
           Summary: Screen flickers - probably double buffered.
                    [regresion]
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: freedesktop_org at dlk.pl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Redirected from: https://bugzilla.kernel.org/show_bug.cgi?id=187251

Screen flicker so much that its hard to watch.

Looks like intel buffers do not set correctly and flickers between old and new
image.

OS: Arch linux
Problem exists for at least 3 months now.
Hardware: MSI GE72 2QC Apache
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5600 (rev 0a)
01:00.0 3D controller: NVIDIA Corporation GM107M [GeForce GTX 960M] (rev a2)
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge - DMI (rev 0a)
00:01.0 PCI bridge: Intel Corporation Broadwell-U PCI Express x16 Controller
(rev 0a)


Running on intel drivers, on nvidia efect is the same because it's a hybrid so
intel still handle final render.

https://dl.dropboxusercontent.com/u/54627341/flicker/MOV_0006.mp4
You see that mostly on non-black parts.

My first guess was that it is backlight pwm problem, i did try that, but then i
saw some strange "ghosts" on screen, for example when image change, you still
see flickering old image:

https://dl.dropboxusercontent.com/u/54627341/flicker/MOV_20161107115931_TSV.mp4


And it is horrible:
https://dl.dropboxusercontent.com/u/54627341/flicker/MOV_0009.mp4
https://dl.dropboxusercontent.com/u/54627341/flicker/MOV_20161107212024_TSV.mp4


And the flicker speed and intensity change depending on laptop load.
It only flickers on laptop screen, external monitors normal.


Also it shows at boot 2 times: 
[drm:intel_dp_start_link_train [i915]] *ERROR* failed to update link training 
right before it starts to flicker

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