[Bug 179574] [NEW] No display (blank screen) on log out

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On log out or switch user, my screen often goes blank, with my monitor
displaying an error message as if it's being fed wrong
resolution/refresh info. Boot up is fine, happens only on log out and
switch user. Ctrl+Alt+Backspace sometimes works to bring back GDM,
however it also often results in a corrupted image (wrong resolution,
visual noise). Sometimes the only solution is to hard reboot the
computer.  This happens with GDM and KDM.

It's difficult for me to tell what package is causing the bug. I have
had a similar issue in Feisty, but It wasn't nearly as severe. At this
point a multi-user setup in a gui environment is impossible with
GDM/KDM. I did find that I don't experience these issues when using XDM
as the login manager.

I can confirm that this happens to me with an Nvidia GeForce 6200 A-LE,
with the nv or nvidia driver, regardless of desktop effects.

Please let me know whatever config/log files I need to supply to help
resolve this issue for future releases!

[lspci]
00:00.0 Host bridge [0600]: Silicon Integrated Systems [SiS] 661FX/M661FX/M661MX Host [1039:0661] (rev 11)
            Subsystem: ABIT Computer Corp. Unknown device [147b:1809]
01:00.0 VGA compatible controller [0300]: nVidia Corporation GeForce 6200 A-LE [10de:0222] (rev a1) (prog-if 00 [VGA])
            Subsystem: eVga.com. Corp. Unknown device [3842:a295]

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: valid-xorg-conf
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No display (blank screen) on log out
https://bugs.launchpad.net/bugs/179574
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