My notebook runs Fedora 11, with Mobile Radeon 4650 card. I've used Catalyst 9.11 since it was out, and it was perfectly stable. After updating to Catalyst 10.1, X hung two times already in two days in plain desktop with no compositing. Both times I was just moving the mouse.

The symptoms: the system is still running, I can ssh to it and reboot, but X is locked hard - no cursor movement, even Capslock not working, and there is nothing suspicious either in the logs or in dmesg.

Stracing X shows:
--- SIGALRM (Alarm clock) @ 0 (0) ---
and that's all.

What can I do to diagnose the issue? Is there a way to enable some debugging while I'm logged in remotely? Or should I just stick to randomly turning off various X/fglrx options and hoping that it helps?

My xorg.conf is below.
Code:
Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "Screen0" 0 0
EndSection

Section "Files"
        ModulePath   "/usr/lib/xorg/modules/extensions/catalyst"
        ModulePath   "/usr/lib/xorg/modules"
EndSection

Section "ServerFlags"
        Option      "AIGLX" "on"
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection

Section "Device"
        Identifier  "Videocard0"
        Driver      "fglrx"
        Option      "OpenGLOverlay" "off"
        Option      "VideoOverlay" "on"
        BusID       "PCI:1:0:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "aticonfig-Monitor[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

Section "Extensions"
        Option      "Composite" "Enable"
EndSection