[Bug 374310] Re: [915g] can't return to X after VT-switching (intel 82915G/GV/910GL)

[Martin Olsson]

@Francis, do you have accesss to two computers? If so it would be very
useful if you captured a stacktrace from X when it's in that black buggy
state.

Please login to the buggy machine using SSH, then trigger the bug (just
switch virtual terminals as you described above). Once the screen is
black, do these things:

* (with the machine still hung) please save the output of the command
"dmesg" and also the files "/var/log/Xorg.0.log" and
"/var/log/Xorg.0.log.old" (I know you already attach one copy of
xorg.log earlier but I'm hoping that there might be some errors printed
into xorg.log when it hangs so that's why I'd like to collect this log
while the machine is still in that buggy "black screen" state).

* install debug packages by running the command "sudo apt-get install
xserver-xorg-core-dbg xserver-xorg-video-intel-dbg libgl1-mesa-dri-dbg
libgl1-mesa-glx-dbg"

* start the gdb debugger using this command "sudo gdb -p $(pidof X)"

* activate logging to a file on disk inside the gdb debugger by running
"set logging file gdb_blackscreen.txt" followed by the command "set
logging on".

* then, record a full backtrace by running the command "backtrace full"
and pressing ENTER until all of it is printed. When you've returned to
the "(gdb)" prompt just type "quit".

* hopefully you can now use the command "sudo reboot now" to reboot the
machine without having to use the powerbutton

* attach the files to this bug report

(PS. There is another way of collecting X backtraces describe here:
https://wiki.ubuntu.com/X/Backtracing#Backtrace%20with%20gdb )

-- 
[915g] can't return to X after VT-switching (intel 82915G/GV/910GL)
https://bugs.launchpad.net/bugs/374310
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