Comment 11 for bug 997470

Upgraded to version 2.5.1 of xdiagnose from precise-proposed (was installed as version 2.5)

Can't see that you have prescribed just what to do with it, but installing and ticking off the debug options did not change the behaviour.

NB - the error at my laptop is quite similar to this, but intermittent on boot, it only occurs about half of the time, and not necessarily right away. It is very frequent on resume from suspend, and almost certain to occur on resume from suspend with 2 X sessions active. There also seems to be a genuine gpu or other X related bug sometimes, which messes up the screen and eventually brings down compiz, and it is hard to tell which is which.

The Xorg logs from before the upgrade of xdiagnose and the debug options have "hung GPU" entries, the present Xorg log does not. But the pop-up panel symptom was definitely there anyway.

root@byttevora:~# ls -l /var/log/X*
-rw-r--r-- 1 root root 35511 Jun 19 09:21 /var/log/Xorg.0.log
-rw-r--r-- 1 root root 35333 Jun 19 09:19 /var/log/Xorg.0.log.old
-rw-r--r-- 1 root root 35819 Jun 19 07:01 /var/log/Xorg.1.log
-rw-r--r-- 1 root root 36557 Jun 18 07:36 /var/log/Xorg.1.log.old
-rw-r--r-- 1 root root 40082 Jun 18 19:11 /var/log/Xorg.2.log
-rw-r--r-- 1 root root 52957 Jun 13 14:54 /var/log/Xorg.2.log.old
root@byttevora:~# grep '(EE)' /var/log/X*
/var/log/Xorg.0.log: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
/var/log/Xorg.0.log.old: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
/var/log/Xorg.1.log: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
/var/log/Xorg.1.log:[ 17290.426] (EE) intel(0): Detected a hung GPU, disabling acceleration.
/var/log/Xorg.1.log:[ 17290.426] (EE) intel(0): When reporting this, please include i915_error_state from debugfs and the full dmesg.
/var/log/Xorg.1.log.old: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
/var/log/Xorg.2.log: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
/var/log/Xorg.2.log:[ 34773.156] (EE) intel(0): Detected a hung GPU, disabling acceleration.
/var/log/Xorg.2.log:[ 34773.213] (EE) intel(0): When reporting this, please include i915_error_state from debugfs and the full dmesg.
/var/log/Xorg.2.log.old: (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
root@byttevora:~#

Will now try the workarounds "disable bootloader graphics" and "disable VESA framebuffer driver".

The PAT memory workaround seems to be targeted on proprietary drivers, while this system has an Intel driver which AFAIK is not proprietary. Will try it later anyway, if the others do not remove the symptoms.