I have this same experience with "system lockup." In my case, there are
no changes to the screen from whatever desktop was in use. My panel
clock shows seconds and the numbers stop changing. I become aware of the
lockup when I cannot move the mouse cursor. In addition, I cannot make
the "kernel magic keys" work to gather any information, nor can I use
the CTRL-ALT-F[1-6] to switch away from X11 to a console.
Uname -a shows:
Linux mumbles 2.6.31-17-generic-pae #54-Ubuntu SMP Thu Dec 10 17:23:29 UTC 2009
i686 GNU/Linux
I have made not changes to the kernel config from whatever is deployed
with the distro or through update-manager.
I don't know enough to report anything else.
My Workstation Details
** Emperor Linux Raven Tablet (Lenovo Thinkpad X61 Tablet)
** Ubuntu Karmic (v9.10)
** lshw
description: Notebook
product: 7764CTO
vendor: LENOVO
version: ThinkPad X61 Tablet
serial: LVB7FTC
width: 32 bits
capabilities: smbios-2.4 dmi-2.4 smp-1.4 smp
*=cpu
description: CPU
product: Intel(R) Core(TM)2 Duo CPU L7500 @ 1.60GHz
vendor: Intel Corp.
physical id: 6
bus info: c...@0
version: 6.15.11
*-memory
description: System Memory
physical id: 22
slot: System board or motherboard
size: 4GiB
*-display:0
description: VGA compatible controller
product: Mobile GM965/GL960 Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: p...@0000:00:02.0
version: 0c
width: 64 bits
clock: 33MHz
capabilities: msi pm bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:28 memory:f8000000-f80fffff
memory:e0000000-efffffff(prefetchable) ioport:1800(size=8)
--
Hard lockups with new kernels
https://bugs.launchpad.net/bugs/475010
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