[Bug 99345] New: [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99345

            Bug ID: 99345
           Summary: [drm:skl_set_cdclk] *ERROR* failed to inform PCU about
                    cdclk change
           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: ryabinin.a.a at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 128854
  --> https://bugs.freedesktop.org/attachment.cgi?id=128854&action=edit
dmesg

Commands
   # xset dpms force suspend && xset dpms force on
sometimes trigger the following error in dmesg:
    [drm:skl_set_cdclk] *ERROR* failed to inform PCU about cdclk change

Sometimes "*ERROR* CPU pipe A FIFO underrun" follows, in that case screen
remains black. See https://bugs.freedesktop.org/show_bug.cgi?id=99344


dmesg with drm.debug=1e attached.

Kernel version - 4.9.2
Hardware - Dell XPS 13 9360

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