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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - X fails to start on QEMU/KVM with cirrus KMS since 3.19-rc"
href="https://bugs.freedesktop.org/show_bug.cgi?id=88921">88921</a>
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<th>Summary</th>
<td>X fails to start on QEMU/KVM with cirrus KMS since 3.19-rc
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
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<th>OS</th>
<td>All
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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>DRM/other
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>tiwai@suse.de
</td>
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<p>
<div>
<pre>X modesetting driver fails to start with cirrus KMS on QEMU/KVM since 3.19-rc.
The culprit is the commit 8975626ea35adcca561f8a81dedccfbc5dd8ec72
drm/cirrus: allow 32bpp framebuffers for cirrus drm
Reverting this commit makes X working again.
X modesetting driver seems to try to open 1024x768x32 graphics, where the pitch
is 4096 and greater than max_pitch (4088) defined in
cirrus_check_framebuffer().
And it doesn't fall back to 24bpp as the patch expected.
Tested with 3.19-rc7 with qemu 2.1 -vga cirrus option.</pre>
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