[GM45] certain xrandr combinations cause crash

[Khashayar Naderehvandi]

This is done on an up-to-date Kubuntu Karmic.
The hardware is an Asus N20A with an intel g45 chip.

When trying to setup my two screens with xrandr, the X server crashes and leaves me at the login prompt. I'm not exactly sure which combinations cause the crash, but definitely a `xrandr --output LVDS --right-of VGA` does. Possibly other combinations too.

Will attach Xorg.0.log.old with "ModeDebug" enabled.

[Geir Ove Myhr (gomyhr)]

Khashayar, would you mind attaching the output of `lspci -vvnn` and getting a full backtrace? There are several methods for getting a full backtrace at https://wiki.ubuntu.com/X/Backtracing . My personal favourite is
sudo /etc/init.d/gdm stop
ulimit -c unlimited
sudo /etc/init.d/gdm start
and then provoke the crash and get a core file in /etc/X11 and then do the backtrace "offline" with
sudo gdb /usr/bin/Xorg /etc/X11/core 2>&1 | tee gdb-Xorg.txt
backtrace full

You may have to add
Section "ServerFlags"
        Option "NoTrapSignals" "true"
EndSection
to your xorg.conf for this to work, but I'm not sure.

[Khashayar Naderehvandi (khashayar)]

Geir, I'll go about that as soon as I can (thanks for pointing me in the right direction), though it might take a while. So if anyone beats me to it, that'd be great...

[Geir Ove Myhr (gomyhr)]

Did you get anywhere with this? Would you be able to get a backtrace of the crash? https://wiki.ubuntu.com/X/Backtracing

[Khashayar Naderehvandi (khashayar)]

I did try to get a hold of backtraces a couple of times, but no matter what I did, /etc/X11/core wasn't saved.
There have been some updates since last I tried this, so I'm gonna see if anything has changed today or tomorrow, and if the problem still persists, I'm gonna give it another shot.

[Khashayar Naderehvandi (khashayar)]

With the latest updates, this particular problem does not occur in Karmic anymore.
I guess the status should be changed to "Fix Released" then.