[Bug 96277] New: laptop display blinks with kernel 4.6.0 (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96277

            Bug ID: 96277
           Summary: laptop display blinks with kernel 4.6.0 (regression)
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: freedesktop at cboltz.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org, tiwai at suse.de

I'm using openSUSE Tumbleweed (rolling release) and the kernel from
Kernel:Stable (actually with two small AppArmor patches on top) so I already
have kernel 4.6.0 instead of the 4.5.4 kernel in Tumbleweed.

uname -r: 4.6.0-4.gaf7ce24-default
uname -m: x86_64

I'm using a laptop (Tuxedo Book BC1703 with i7-4710MQ CPU) with intel graphics
and two screens (laptop display + external screen via HDMI), but also see this
bug when the external screen is disconnected.

Kernel 4.6.0 causes the laptop screen to blink / flicker as soon as X starts
(both login manager and in KDE) which makes the laptop display unusable and
hurts in the eyes. This blinking is also reproducable with "X -retro".

I can "fix" this by booting 4.5.4, so this is clearly a regression in 4.6.0.

Also, booting kernel 4.6.0 with i915.enable_psr=0 stops the blinking.

Reproducable: always (the blinking with 4.6.0 without boot parameters, and also
the non-blinking with i915.enable_psr=0 or kernel 4.5.4)


I initially reported this bug on 
    https://bugzilla.opensuse.org/show_bug.cgi?id=981346
You can find logs (dmesg with drm.debug=0x0e), hardware details and some other
details there.

If you need more information, just ask ;-)

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