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Public bug reported:

On a system with a Sapphire ATI Radeon HD 4350 512MB DDR2 PCI-E HDMI/DVI-I/VGA card I upgraded from
Ubuntu Desktop 10.10 64-bit (with Linux 2.6.35-30-generic #54-Ubuntu SMP Tue Jun 7 18:41:54 UTC 2011 x86_64) to
Ubuntu Desktop 11.04 64-bit with Linux 2.6.38-10-generic #44-Ubuntu SMP Thu Jun 2 21:32:22 UTC 2011 x86_64.

After selecting standard boot in the GRUB menu, I regularly get the
blank screen and I'm not able to log in.

If I select the recovery mode in the GRUB menu, I am able to choose
failsafeX and to log in to a GDM session.

Near the end of /var/log/Xorg.0.log I found:

Backtrace:
[    18.246] 0: /usr/bin/X (xorg_backtrace+0x26) [0x4a2656]
[    18.246] 1: /usr/bin/X (0x400000+0x621ca) [0x4621ca]
[    18.246] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7f13082db000+0xfc60) [0x7f13082eac60]
[    18.246] 3: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f1305161000+0xd23fd) [0x7f13052333fd]
[    18.246] 4: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f1305161000+0xd465f) [0x7f130523565f]
[    18.246] 5: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f1305161000+0x8586e) [0x7f13051e686e]
[    18.246] 6: /usr/bin/X (xf86SetDesiredModes+0x1e3) [0x48c7d3]
[    18.246] 7: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x7f1305161000+0x44dd5) [0x7f13051a5dd5]
[    18.246] 8: /usr/bin/X (AddScreen+0x1a8) [0x42e658]
[    18.246] 9: /usr/bin/X (InitOutput+0x294) [0x470094]
[    18.246] 10: /usr/bin/X (0x400000+0x218c3) [0x4218c3]
[    18.246] 11: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xff) [0x7f1307224eff]
[    18.246] 12: /usr/bin/X (0x400000+0x21629) [0x421629]
[    18.246] Segmentation fault at address 0x1b0
[    18.246] 
Caught signal 11 (Segmentation fault). Server aborting

Booting to the earlier version of Linux (2.6.35-30) does not help.

I would appreciate very much a quick solution or workaround as otherwise
I would need to revert to Ubuntu 10.10.

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/802186

Title:
  after boot X server crashes (segmentation fault) with blank screen

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