[Bug 92175] New: Unable to connect 4K display FIFO underrun on pipe C.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92175

            Bug ID: 92175
           Summary: Unable to connect 4K display FIFO underrun on pipe C.
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: amatcama at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi,
 I am using a Lenovo Thinkpad t540p running ArchLinux (so most likely running
latest version of intel driver). I have a docking station and am trying to
connect a Dell P2415Q monitor to it through DP. Using xrandr or arandr, I can
see that the monitor is successfully detected but when I enable it, although it
says that the monitor is enabled, I don't see any output on the screen and I
get the following in dmesg:
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo
underrun on pipe C
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO
underrun
When I enable MST on the monitor however, it seems to work. But using MST this
monitor cannot run at 60hz.
Any clues on what the issue could be ?

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