[Bug 370113] [NEW] Blank screen, machine hangs, on logout

[Luke Plant]

Public bug reported:

Using KDM, when I log out of my KDE session I get a blank screen.
Pressing 'Alt F1' or 'Ctrl Alt F1' does not get me a virtual terminal.
Ctrl-Alt-Backspace seems to do nothing (not even disk activity).  My
only option is to reboot.  This happens every time.

If I use GDM, this does not occur, hence I'm putting this as a KDM bug,
but that might be the wrong package.

I have been using Jaunty pre-releases and continuously updating for
several months, and this wasn't happening a few weeks ago. I cannot pin
down exactly when it started happening (since I don't actually just log
out that often).

I'm using an ATI graphics card, with the open source radeon driver.

Xorg logs shows a crash.

Extract below:

(EE) AIGLX error: dlopen of /usr/lib/dri/(null)_dri.so failed (/usr/lib/dri/(null)_dri.so: cannot open shared object file: No such file or directory)
 (EE) AIGLX: reverting to software rendering
 (II) AIGLX: Screen 0 is not DRI capable
 (II) AIGLX: Loaded and initialized /usr/lib/dri/swrast_dri.so
 (II) GLX: Initialized DRISWRAST GL provider for screen 0
 (II) RADEON(0): Setting screen physical size to 367 x 230
Backtrace:
 0: /usr/bin/X(xorg_backtrace+0x3b) [0x813518b]
 1: /usr/bin/X(xf86SigHandler+0x55) [0x80c7be5]
 2: [0xb7fe1400]
 3: /usr/bin/X [0x817fca2]
 4: /usr/bin/X [0x8180d4f]
 5: /usr/bin/X(CreateDefaultStipple+0x10b) [0x809f93b]
 6: /usr/bin/X(main+0x266) [0x8072196]
 7: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe5) [0xb7ba7775]
 8: /usr/bin/X [0x80717a1]

Other info about my system will be attached shortly.

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

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Blank screen, machine hangs, on logout
https://bugs.launchpad.net/bugs/370113
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