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Xorg cpu usage 100% on Squeeze

Hi Everybody

I have a vanilla Squeeze up and running on a YDL PowerStation which, except for one issue, is now working perfectly.

Usually after a couple of hours usage the system (as in X) will suddenly become unresponsive (sluggish mouse and keyboard doesn't work at all). If I ssh in from another machine and run top I can see that Xorg CPU usage is at 100% and on reboot the output of /var/log/Xorg.0.log.old is as [1] below:

It has always happened when browsing with Iceweasel. Has anyone on Squeeze run into this issue? I see a very similar bug report #620138 has been filed recently about xserver-xorg-video-nouveau. The PowerStation has an ATI X1650.

If anyone has any suggestions I would be very grateful.

Many thanks in advance


[1] Partial Output of /var/log/Xorg.0.log.old

[mi] EQ overflowing. The server is probably stuck in an infinite loop.

0: /usr/bin/Xorg (xorg_backtrace+0x58) [0x10071668]
1: /usr/bin/Xorg (mieqEnqueue+0x1d8) [0x10069bf8]
2: /usr/bin/Xorg (xf86PostMotionEventP+0x10c) [0x1009554c]
3: /usr/lib/xorg/modules/input/evdev_drv.so (0xf1e3000+0x50f0) [0xf1e80f0]
4: /usr/lib/xorg/modules/input/evdev_drv.so (0xf1e3000+0x54c4) [0xf1e84c4]
5: /usr/bin/Xorg (0x10000000+0x8bd68) [0x1008bd68]
6: /usr/bin/Xorg (0x10000000+0x12f4e8) [0x1012f4e8]
7: (vdso) (__kernel_sigtramp32+0x0) [0x100364]
8: (vdso) (__kernel_sigtramp32+0x0) [0x100364]
9: (vdso) (__kernel_sigtramp32+0xff92a720) [0xffa2aa84]
10: /usr/lib/libdrm.so.2 (drmDMA+0xa8) [0xf7be1c8]
11: /usr/lib/xorg/modules/drivers/radeon_drv.so (0xf63e000+0x1530c) [0xf65330c] 12: /usr/lib/xorg/modules/drivers/radeon_drv.so (0xf63e000+0x1580c) [0xf65380c] 13: /usr/lib/xorg/modules/drivers/radeon_drv.so (0xf63e000+0xc3388) [0xf701388]
14: /usr/lib/xorg/modules/libexa.so (0xf55d000+0xdc2c) [0xf56ac2c]
15: /usr/lib/xorg/modules/libexa.so (0xf55d000+0xe810) [0xf56b810]
16: /usr/bin/Xorg (0x10000000+0xf168c) [0x100f168c]
17: /usr/bin/Xorg (CompositePicture+0x21c) [0x100df0fc]
18: /usr/lib/xorg/modules/libexa.so (0xf55d000+0xd748) [0xf56a748]
19: /usr/bin/Xorg (CompositeTrapezoids+0xa8) [0x100dee08]
20: /usr/bin/Xorg (0x10000000+0xeb318) [0x100eb318]
21: /usr/bin/Xorg (0x10000000+0xe3ae8) [0x100e3ae8]
22: /usr/bin/Xorg (0x10000000+0x4a1f0) [0x1004a1f0]
23: /usr/bin/Xorg (0x10000000+0x1d0d4) [0x1001d0d4]
24: /lib/libc.so.6 (0xfacb000+0x1f63c) [0xfaea63c]
25: /lib/libc.so.6 (0xfacb000+0x1f800) [0xfaea800]

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