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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - FIFO underrun in Thinkpad X30 (intel i830M)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93682">93682</a>
</td>
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<th>Summary</th>
<td>FIFO underrun in Thinkpad X30 (intel i830M)
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/intel
</td>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
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<th>Reporter</th>
<td>monnier@iro.umontreal.ca
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=120990" name="attach_120990" title="dmesg | grep -C3 drm">attachment 120990</a> <a href="attachment.cgi?id=120990&action=edit" title="dmesg | grep -C3 drm">[details]</a></span>
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.</pre>
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