[Bug 112250] New: Screen rapidly blinks on and off (UHD Graphics 605)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=112250

            Bug ID: 112250
           Summary: Screen rapidly blinks on and off (UHD Graphics 605)
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: not set
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: psychonaut at nothingisreal.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 145936
  --> https://bugs.freedesktop.org/attachment.cgi?id=145936&action=edit
Video showing bug

Summary:

On an Acer TravelMate B118 with UHD Graphics 605, the screen rapidly blinks on
and off when performing certain activities.


System description:

I have a new Acer TravelMate B118-M-P98A laptop (Acer article number
NX.VHPEG.005) which has an Intel Pentium Silver N5000 and an integrated UHD
Graphics 605 video controller.  I am running openSUSE Leap 15.1 (x86_64) with
its official 4.12.14-lp151.28.25-default kernel.


Problem description and how to reproduce:

The screen frequently blinks on and off in rapid succession, usually two to
eight times in a row.  (The screen isn't merely turning black; it looks like it
is actually powering off and back on again.)  The problem is reproducible in
that certain activities consistently trigger the flashing.  These include, but
are not limited to, the following:

* Booting openSUSE 15.1, shortly before the display manager shows the login
prompt.

* Using the Fn+Up or Fn+Dn keys to adjust the system volume (which also
triggers a visual OSD)

* Having a system notification appear in KDE Plasma

* Booting or shutting down Windows 7 in a VirtualBox

* When running Windows 7 in a VirtualBox, switching between folders in the
Windows Explorer

Once the blinking problem occurs, it can't be triggered again for a few
seconds.

I am attaching a video showing the blinking problem.  In the video, I am in a
KDE Plasma session and have just pressed one of the volume control hotkeys
(Fn+Up or Fn+Dn), which has triggered the blinking.


Diagnostics:

Running dmesg reports a bunch of "intel_display_power_put+0xd3/0x100" warnings.
 These seem to correspond to the instances of blinking:

[   18.703093] WARNING: CPU: 2 PID: 437 at
../drivers/gpu/drm/i915/intel_runtime_pm.c:1692
intel_display_power_put+0xf1/0x100 [i915]
[   18.703308] WARNING: CPU: 2 PID: 437 at
../drivers/gpu/drm/i915/intel_runtime_pm.c:186
intel_display_power_put+0xd3/0x100 [i915]
[   21.724409] WARNING: CPU: 2 PID: 437 at
../drivers/gpu/drm/i915/intel_runtime_pm.c:186
intel_display_power_put+0xd3/0x100 [i915]
[   30.884626] WARNING: CPU: 1 PID: 278 at
../drivers/gpu/drm/i915/intel_runtime_pm.c:186
intel_display_power_put+0xd3/0x100 [i915]
[   33.892611] WARNING: CPU: 3 PID: 276 at
../drivers/gpu/drm/i915/intel_runtime_pm.c:186
intel_display_power_put+0xd3/0x100 [i915]
[   56.932533] WARNING: CPU: 3 PID: 276 at
../drivers/gpu/drm/i915/intel_runtime_pm.c:186
intel_display_power_put+0xd3/0x100 [i915]

Attached is a full dmesg with debugging enabled.  The dmesg command was run
immediately after the system booted up (which, as I mentioned, itself causes
the screen to blink).

Also attached, in case they are necessary, are outputs of glxinfo and xrandr.

After some web searching for similar problems, I have tried booting with the
kernel parameters i915.enable_psr=0 or i915.enable_fbc=0.  However, neither of
these solved the problem.

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