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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 - Monitor not recognized after upgrading to a Radeon RX 480"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97730">97730</a>
</td>
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<th>Summary</th>
<td>Monitor not recognized after upgrading to a Radeon RX 480
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/AMDgpu
</td>
</tr>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>damien@grassart.com
</td>
</tr></table>
<p>
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<pre>Created <span class=""><a href="attachment.cgi?id=126413" name="attach_126413" title="/sys/class/drm/card0-DP-2/edid">attachment 126413</a> <a href="attachment.cgi?id=126413&action=edit" title="/sys/class/drm/card0-DP-2/edid">[details]</a></span>
/sys/class/drm/card0-DP-2/edid
I upgraded my video card from a Radeon HD 8770 to a Radeon RX 480 after which
my monitor stopped working. I believe it is an EDID problem since dmesg
contains this repeated 4 times:
[ +0.120622] [drm:drm_edid_block_valid [drm]] *ERROR* EDID checksum is
invalid, remainder is 128
[ +0.000011] Raw EDID:
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000004] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000004] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000004] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[ +0.000005] ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
As well as:
[ +0.000005] amdgpu 0000:01:00.0: DP-2: Ignoring invalid EDID block 1.
[ +0.149608] amdgpu 0000:01:00.0: No connectors reported connected with modes
xrandr shows this error message when I run it: "xrandr: Output DisplayPort-1 is
not disconnected but has no modes".
I can actually get the monitor working by manually adding a mode:
$ cvt 2560 1440
# 2560x1440 59.96 Hz (CVT 3.69M9) hsync: 89.52 kHz; pclk: 312.25 MHz
Modeline "2560x1440_60.00" 312.25 2560 2752 3024 3488 1440 1443 1448 1493
-hsync +vsync
$ xrandr --newmode "2560x1440" 312.25 2560 2752 3024 3488 1440 1443 1448 1493
-hsync +vsync
$ xrandr --addmode DisplayPort-1 2560x1440
I've attached the /sys/class/drm/card0-DP-2/edid file if that is helpful.
Please let me know if I can provide anything else.</pre>
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