[Bug 97450] New: [SKL] [regression] Random display flickering on Kernel 4.8 with dual-screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97450

            Bug ID: 97450
           Summary: [SKL] [regression] Random display flickering on Kernel
                    4.8 with dual-screen
           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: direx at betriebsdirektor.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125975
  --> https://bugs.freedesktop.org/attachment.cgi?id=125975&action=edit
dmesg from drm-intel-fixes (177d91aa) with drm.debug=0xe

On Kernel 4.8-rc3 with the latest drm-intel-fixes patches I am getting random
display flickering.

I also applied by the patch series "Finally fix watermarks". On Kernel 4.7 and
earlier I do not have any flickering issues.

The flickering only happens on my HDMI display and only if the mouse cursor is
present on the display. However it is unrelated to cursor movement. I also
could not find any suspicious messages in dmesg which appear at the time of the
flickering. There are the usual PIPE underruns and an atomic update failures in
the kernel log.

The flickering itself happens once every other minute.

Hardware: Lenovo Thinkpad L460 with latest BIOS, Ultra Dock, two external
screens (HDMI+DVI)
CPU: i5-6200U
Kernel: 4.8-rc3 with patches from drm-intel-fixes
OS: Arch Linux

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