Comment 22 for bug 165093

I can confirm this as well. I do not believe it is related to the restricted driver, it happens no matter if I use the open source radeon driver, or ATI's fglrx in aiglx mode. It most notably occurs when pulling down yakuake, but it could happen in other applications as well. It could run fine for a few days, and then crash two or three times in one hour, usually it occurs about once a day (8 hour day). The issue does not occur if I switch window managers to kwin, as others have reported. I am also using 2.6.24-5-generic from Hardy (in a attempt to resolve this issue with no luck).

I did not notice this in Feisty, probably because I used fglrx with xgl instead aiglx. Could aiglx also be involved with this issue?

Backtrace:
0: /usr/bin/X(xf86SigHandler+0x81) [0x80c95d1]
1: [0xb7fcb420]
2: /usr/bin/X [0x817e4ad]
3: /usr/bin/X [0x817aaff]
4: /usr/bin/X(CompositeGlyphs+0x9a) [0x81613aa]
5: /usr/bin/X [0x8169029]
6: /usr/bin/X [0x8164425]
7: /usr/bin/X [0x815765e]
8: /usr/bin/X(Dispatch+0x1aa) [0x808f47a]
9: /usr/bin/X(main+0x495) [0x8076f05]
10: /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe0) [0xb7dce450]
11: /usr/bin/X(FontFileCompleteXLFD+0x1e1) [0x8076241]

Fatal server error:
Caught signal 11. Server aborting

(II) AIGLX: Suspending AIGLX clients for VT switch
disable montype: 2
disable montype: 1
(II) RADEON(0): RADEONRestoreMemMapRegisters() :
(II) RADEON(0): MC_FB_LOCATION : 0x1fff0000
(II) RADEON(0): MC_AGP_LOCATION : 0x27ff2000
finished PLL2
finished PLL1
Entering Restore TV
Restore TV PLL
Restore TVHV
Restore TV Restarts
Leaving Restore TV