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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 - card detects non-existent monitor on display port"
href="https://bugs.freedesktop.org/show_bug.cgi?id=97857">97857</a>
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<th>Summary</th>
<td>card detects non-existent monitor on display port
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>Driver/Radeon
</td>
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<th>Assignee</th>
<td>xorg-driver-ati@lists.x.org
</td>
</tr>
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<th>Reporter</th>
<td>danadam7@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
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<div>
<pre>My graphic card is:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
I have one monitor connected to DVI port. Since kernel 4.5.0-2 my Xorg.0.log
shows that something is also connected to display port, here's a diff of the
log between kernel 4.5.0-1 and 4.5.0-2:
(II) RADEON(0): EDID for output DisplayPort-0
+(II) RADEON(0): Printing probed modes for output DisplayPort-0
+(II) RADEON(0): Modeline "1024x768"x60.0 65.00 1024 1048 1184 1344 768 771
777 806 -hsync -vsync (48.4 kHz e)
+(II) RADEON(0): Modeline "800x600"x60.3 40.00 800 840 968 1056 600 601 605
628 +hsync +vsync (37.9 kHz e)
+(II) RADEON(0): Modeline "800x600"x56.2 36.00 800 824 896 1024 600 601 603
625 +hsync +vsync (35.2 kHz e)
+(II) RADEON(0): Modeline "848x480"x60.0 33.75 848 864 976 1088 480 486 494
517 +hsync +vsync (31.0 kHz e)
+(II) RADEON(0): Modeline "640x480"x59.9 25.18 640 656 752 800 480 490 492
525 -hsync -vsync (31.5 kHz e)
(II) RADEON(0): EDID for output HDMI-0
(II) RADEON(0): EDID for output DVI-0
...
-(II) RADEON(0): Output DisplayPort-0 disconnected
+(II) RADEON(0): Output DisplayPort-0 connected
(II) RADEON(0): Output HDMI-0 disconnected
(II) RADEON(0): Output DVI-0 connected
-(II) RADEON(0): Using exact sizes for initial modes
-(II) RADEON(0): Output DVI-0 using initial mode 1920x1200 +0+0
+(II) RADEON(0): Using fuzzy aspect match for initial modes
+(II) RADEON(0): Output DisplayPort-0 using initial mode 1024x768 +0+0
+(II) RADEON(0): Output DVI-0 using initial mode 1024x768 +0+0
(II) RADEON(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise
stated.
...
-(II) RADEON(0): Setting screen physical size to 508 x 317
+(II) RADEON(0): Setting screen physical size to 270 x 203
As a result my display manager (sddm) loads in 1024x768 resolution. It goes
back to normal, i.e., 1920x1200 when I log in and KDE loads up.
When I explicitly disable DisplayPort by adding video=DP-1:d to kernel options,
everything goes back to normal.
My original issue was with geometry of my console (
<a href="https://lists.debian.org/debian-user/2016/06/msg00851.html">https://lists.debian.org/debian-user/2016/06/msg00851.html</a> ), so the problem
might be somewhere deeper than xorg.</pre>
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