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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [SNB] Page flips hang indefinitely, apparently waiting for interrupts that never happen"
href="https://bugs.freedesktop.org/show_bug.cgi?id=75502">75502</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>[SNB] Page flips hang indefinitely, apparently waiting for interrupts that never happen
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>simon@farnz.org.uk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>I'm seeing pageflips give up on me on SNB hardware - Celeron 847, i5-2400S -
where the CRTC becomes unexpectedly busy and never recovers.
When I'm failed, I can see interrupts coming in (Interrupts received in
/sys/kernel/debug/dri/0/i915_gem_interrupt increments), but the queued flip
never happens:
# cat /sys/kernel/debug/dri/0/i915_gem_pageflip
Flip queued on pipe A (plane A)
Stall check enabled, 1 prepares
Old framebuffer gtt_offset 0x01354000
New framebuffer gtt_offset 0x0093c000
No flip due on pipe B (plane B)
# cat /sys/kernel/debug/dri/0/i915_gem_interrupt
North Display Interrupt enable: 8eb48585
North Display Interrupt identity: 00000000
North Display Interrupt mask: 734bfa7a
South Display Interrupt enable: ffffffff
South Display Interrupt identity: 00000000
South Display Interrupt mask: f114ffff
Graphics Interrupt enable: 00401001
Graphics Interrupt identity: 00000000
Graphics Interrupt mask: ffffffff
Interrupts received: 1006958
Graphics Interrupt mask (render ring): ffffffff
Current sequence (render ring): 1472838
Graphics Interrupt mask (bsd ring): ffffffff
Current sequence (bsd ring): 1271460
Graphics Interrupt mask (blitter ring): ffffffff
Current sequence (blitter ring): 1472839
I'm running packages from Fedora 20:
# rpm -q mesa-libGL kernel xorg-x11-server-Xorg xorg-x11-drv-intel libva-
intel-driver libdrm
mesa-libGL-9.2.5-1.20131220.fc20.x86_64
kernel-3.13.3-201.fc20.x86_64
xorg-x11-server-Xorg-1.14.4-90.fc20.x86_64
xorg-x11-drv-intel-2.21.15-5.fc20.x86_64
libva-intel-driver-1.2.1-1.fc20.x86_64
libdrm-2.4.50-1.fc20.x86_64
I will attach dmesg from a failed system - note that no error state has been
collected.</pre>
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