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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Dual screen causes KDE crash on NV50 (NV98) in nouveau (bisected)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86164">86164</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Dual screen causes KDE crash on NV50 (NV98) in nouveau (bisected)
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr>
<tr>
<th>Version</th>
<td>git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/nouveau
</td>
</tr>
<tr>
<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>maris.nartiss@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>xorg-team@lists.x.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=109296" name="attach_109296" title="A Xorg log file of failing session">attachment 109296</a> <a href="attachment.cgi?id=109296&action=edit" title="A Xorg log file of failing session">[details]</a></span>
A Xorg log file of failing session
Starting with "[86024ceef015ffe31a204cc5bc6c326a19363ff1] glamor: initial
support (no dri)" is not possible to configure a secondary monitor while
running KDE 4.14.2.
Steps to reproduce:
Version A:
* while a KDE session is open, plug in a secondary monitor
* use KDE display configuration tool to enable second monitor
* X11 server gets restarted -> KDM window appears
Version B:
* start system with a secondary monitor attached
* observe how system is running in a "clone" mode (there is output on
secondary monitor)
* log in in KDM
* observe how X11 gets restarted -> KDM window appears
Solution - use any revision before 86024ceef0
Unfortunately log files are empty - there are no meaninful messages that could
shead a light on the issue. No crash is recorded, xorgsession-errors are just
indicating on IO error while connecting to X11;
There is some issue with EDID, although KDE monitor configuration displays
correct information. dmesg snip:
[ 0.000000] Kernel command line: BOOT_IMAGE=/boot/kernel-3.17.2
root=/dev/sda2 ro nouveau.noaccel=1 resume=/dev/sda6
[ 13.310327] nouveau 0000:01:00.0: irq 36 for MSI/MSI-X
[ 14.481036] fbcon: nouveaufb (fb0) is primary device
[ 14.818215] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device
[ 14.818217] nouveau 0000:01:00.0: registered panic notifier
[ 14.832075] [drm] Initialized nouveau 1.2.0 20120801 for 0000:01:00.0 on
minor 0
[ 103.530600] Raw EDID:
[ 103.530603] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530605] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530605] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530606] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530607] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530608] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530609] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530610] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 103.530614] nouveau 0000:01:00.0: VGA-1: EDID block 0 invalid.
[ 103.530617] nouveau E[ DRM] DDC responded, but no EDID for VGA-1
git bisect start
# bad: [3fb97d78202213c1221a1d3ad8a5cebda78fdf44] fix null pointer deref
git bisect bad 3fb97d78202213c1221a1d3ad8a5cebda78fdf44
# good: [480f0998ffed6d9a5c6656dba75182f00fd88a1b] bump to 1.0.10 for release
git bisect good 480f0998ffed6d9a5c6656dba75182f00fd88a1b
# bad: [f0fa8313714c2a5b16e784b257b5ff79da3a443b] dri2: Enable sync of
bufferswaps to Vblank by default.
git bisect bad f0fa8313714c2a5b16e784b257b5ff79da3a443b
# bad: [81148bb1dbc7007c021c59411d56cb31cfc74ef2] glamor: provide dri3 support
when enabled
git bisect bad 81148bb1dbc7007c021c59411d56cb31cfc74ef2
# good: [b24cae0bf5db6ece21439d4c6ff3668aed4c78d6] dri2: move "is supported"
checks out of nv_driver.c
git bisect good b24cae0bf5db6ece21439d4c6ff3668aed4c78d6
# good: [4b138ab18f58c6d459e21dc319615f536c8e69c8] merge nv_dma.c into
nv_accel_common.c
git bisect good 4b138ab18f58c6d459e21dc319615f536c8e69c8
# good: [fd0ce8839f307693d86c7602dd926ce79e6b777d] add support for maxwell,
minus Xv/renderaccel
git bisect good fd0ce8839f307693d86c7602dd926ce79e6b777d
# bad: [86024ceef015ffe31a204cc5bc6c326a19363ff1] glamor: initial support (no
dri)
git bisect bad 86024ceef015ffe31a204cc5bc6c326a19363ff1
# first bad commit: [86024ceef015ffe31a204cc5bc6c326a19363ff1] glamor: initial
support (no dri)</pre>
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