This problem has also been seen now around 5 times on my sons Dell Studio 16 using 11.04. >From Xorg log:
[ 334.464] (II) RADEON(0): Modeline "1366x768"x0.0 70.43 1366 1414 1446 1486 768 770 775 790 +hsync -vsync (47.4 kHz) [ 1663.008] Backtrace: [ 1663.008] 0: /usr/bin/X (xorg_backtrace+0x3b) [0x80eab1b] [ 1663.008] 1: /usr/bin/X (0x8048000+0x5fac8) [0x80a7ac8] [ 1663.009] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x69a40c] [ 1663.009] 3: /usr/bin/X (_CallCallbacks+0x3e) [0x8074e1e] [ 1663.009] 4: /usr/bin/X (WriteToClient+0x267) [0x80a7607] [ 1663.009] 5: /usr/lib/xorg/modules/extensions/libdri2.so (ProcDRI2WaitMSCReply+0x62) [0x407bf2] [ 1663.009] 6: /usr/lib/xorg/modules/extensions/libdri2.so (DRI2WaitMSCComplete+0x75) [0x405fc5] [ 1663.009] 7: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x48f000+0xce17c) [0x55d17c] [ 1663.009] 8: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x48f000+0xd1f12) [0x560f12] [ 1663.009] 9: /lib/i386-linux-gnu/libdrm.so.2 (drmHandleEvent+0xf5) [0x21c665] [ 1663.009] 10: /usr/lib/xorg/modules/drivers/radeon_drv.so (0x48f000+0xd1e2f) [0x560e2f] [ 1663.009] 11: /usr/bin/X (WakeupHandler+0x52) [0x8074602] [ 1663.009] 12: /usr/bin/X (WaitForSomething+0x1ba) [0x80a1f3a] [ 1663.009] 13: /usr/bin/X (0x8048000+0x27f1e) [0x806ff1e] [ 1663.009] 14: /usr/bin/X (0x8048000+0x1a81c) [0x806281c] [ 1663.010] 15: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xe7) [0x91de37] [ 1663.010] 16: /usr/bin/X (0x8048000+0x1a411) [0x8062411] [ 1663.010] Segmentation fault at address 0x98cea68 [ 1663.010] Caught signal 11 (Segmentation fault). Server aborting [ 1663.010] Please consult the The X.Org Foundation support at http://wiki.x.org -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/780358 Title: Random X crashes in Ubuntu 11.04 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs