[Bug 93682] New: FIFO underrun in Thinkpad X30 (intel i830M)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93682

            Bug ID: 93682
           Summary: FIFO underrun in Thinkpad X30 (intel i830M)
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: monnier at iro.umontreal.ca
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 120990
  --> https://bugs.freedesktop.org/attachment.cgi?id=120990&action=edit
dmesg | grep -C3 drm

X has recently become unusable in my Debian-testing install on Thinkpad X30: it
starts OK but soon after logging in (via lighdm into XFCE), the screen goes
black.  I can switch to vt1 where the console is displayed properly, but the vt
showing X11 stays desperately pitch dark.

During the boot (and even before X11 is launched) I saw some error messages
including:

    [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 23: Can't
calculate constants, dotclock = 0!

and

    [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

So I rebooted with "drm.debug=6".  Find the resulting "grep -C3 drm" output
attached.

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