[Bug 96736] New: kernel 4.6 regression: PSR causes screen to flash

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96736

            Bug ID: 96736
           Summary: kernel 4.6 regression: PSR causes screen to flash
           Product: DRI
           Version: unspecified
          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: xavierb at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 124786
  --> https://bugs.freedesktop.org/attachment.cgi?id=124786&action=edit
dmesg drm.debug=0xe

(maybe dup of #96704)

Since updating to linux 4.6, the screen flashes (to black screen).
(tested linux mainline 4.7 git, problem still occurs)

The problems appears shortly after booting the kernel, before starting X. (and
persits forever) 
if the screen is updated continuously (say, by moving the mouse or running
glxgear), the flashing stop.


git bisect points to 9b58e352b463f2f096d699d47b1c4c57879b617f
drm/i915: Enable PSR by default on Haswell and Broadwell.


Additional Information
======================
The system is Toshiba Satellite P70-B11-R. 
When booting with "i915.enable_psr=0" the problem goes away.
And neither  "i915.enable_psr=2" nor  "i915.enable_psr=3" fix the problem - it
does seem the flashing frequency is a bit different, though.


Steps To Reproduce
==================
Just start the system. I'm using gnome, but the screen flahsing can be seen
even in console before gdm starts.

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