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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 --- - [bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=56139">56139</a>
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</tr>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)
</td>
</tr>
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<th>Severity</th>
<td>major
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>alexandre.f.demers@gmail.com
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Radeon
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
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<pre>Using ArchLinux 64, own built kernel (vanilla) with an HD 6950 (CAYMAN).
When testing kernel 3.7-rc1, the screen becomes unreadable. It's either
completely black or in a flickering state making the display unusable. It is
very similar to what was observed in <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Latest radeon dri driver on HD6950 with GRUB set gfxpayload=$linux_gfx_mode put the display in a flickering state"
href="show_bug.cgi?id=43655">bug 43655</a>.
At the time of <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED DUPLICATE - Latest radeon dri driver on HD6950 with GRUB set gfxpayload=$linux_gfx_mode put the display in a flickering state"
href="show_bug.cgi?id=43655">bug 43655</a>, the problem had been fixed by
<a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=81ee8fb6b52ec69eeed37fe7943446af1dccecc5">http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=81ee8fb6b52ec69eeed37fe7943446af1dccecc5</a>.
So it was working OK with kernel 3.6.
I've bisected between kernel 3.6 and 3.7-rc1 and the faulty identified commit
is the following:
62444b7462a2b98bc78d68736c03a7c4e66ba7e2 is the first bad commit
commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2
Author: Alex Deucher <<a href="mailto:alexander.deucher@amd.com">alexander.deucher@amd.com</a>>
Date: Wed Aug 15 17:18:42 2012 -0400
drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)
- Stop the displays from accessing the FB
- Block CPU access
- Turn off MC client access
This should fix issues some users have seen, especially
with UEFI, when changing the MC FB location that result
in hangs or display corruption.
v2: fix crtc enabled check noticed by Luca Tettamanti
Signed-off-by: Alex Deucher <<a href="mailto:alexander.deucher@amd.com">alexander.deucher@amd.com</a>>
:040000 040000 3e0d33c9b4eda29ced814fe9a863efe63e53f14c
4932561607b160734ec1eade927a9fe18c9f3f1b M drivers</pre>
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