[Bug 104513] New: freezes with dual monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104513

            Bug ID: 104513
           Summary: freezes with dual monitors
           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: blumens at fi.muni.cz
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

I'm experiencing frequent system freezes since I connected a second monitor.
In general the hang occurs a few times a day and usually when drawing on both
monitors simultaneously. I tried to reduce the refresh rate to 30Hz as suggest
in bug 99908, but that does not seem to have any effect.

Hardware: Intel NUC 7i7BNH and two 4K monitors

uname -a:

  Linux wasp 4.14.11-1-ARCH #1 SMP PREEMPT Wed Jan 3 07:02:42 UTC 2018 x86_64
GNU/Linux

kernel parameters (the last two have no effect on the bug):

  i915.enable_rc6=0 i915.semaphores=1 drm.debug=0x1e

The only messages appearing in my syslog during the crash are:

  Jan 06 10:52:43 wasp kernel: [drm] Reducing the compressed framebuffer size.
This may lead to less power savings
  Jan 06 10:52:43 wasp kernel: [drm] Reducing the compressed framebuffer size.
This may lead to less power savings
  Jan 06 10:52:43 wasp kernel: [drm] Reducing the compressed framebuffer size.
This may lead to less power savings

If you need me to provide more information, please ask.

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