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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [G33] blank screen with KMS on DVI output"
href="https://bugs.freedesktop.org/show_bug.cgi?id=81422">81422</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[G33] blank screen with KMS on DVI output
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>minor
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>krzysiek@podlesie.net
</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>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=102911" name="attach_102911" title="dmesg (Linux drm-intel-fixes-2014-07-09)">attachment 102911</a> <a href="attachment.cgi?id=102911&action=edit" title="dmesg (Linux drm-intel-fixes-2014-07-09)">[details]</a></span>
dmesg (Linux drm-intel-fixes-2014-07-09)
Hi,
the kernel with KMS does not initialize the display correctly on some old
all-in-one PC with G33 chipset. The kernel reports some errors, including "SDVO
pixel multiplier mismatch" and "VGA-1: EDID block 0 invalid", however the
display seems to be connected using DVI1 port.
The monitor seems to report some strange mode 1024x819 which is used by
default. However setting the mode to 1024x768 at 60 Hz does not fix the
problem. The screen is blank both with the fbcon and the X server.
# xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 32767 x 32767
VGA1 disconnected (normal left inverted right x axis y axis)
DVI1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 376mm x
301mm
1024x768 75.1 + 75.0 70.1 60.0*
1024x819 75.0
800x640 75.0
800x600 75.0 60.3
640x480 75.0 72.8 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
I've tested Linux 3.12.9, 3.15.4 and drm-intel-fixes-2014-07-09. I'm attaching
the dmesg from Linux drm-intel-fixes-2014-07-09 with drm.debug=0xe.</pre>
</div>
</p>
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