I have tried to narrow down the problem further. This is quite time consuming 
as sometimes the crash does not occur in 20 suspend and resume cycles and next 
time it crashes after the second try.
Anyway, resume works reliably when booting with init=/bin/bash. It also works 
reliably if I switch to a text console and kill gdm leaving the nvidia module 
loaded. However, using both methods the screen stays black after resuming but 
the keyboard works. There were also no crashes so far using the vesa driver 
instead of the proprietary NVIDIA driver. I tried all combinations of the 
options in the acpi-support file but it did not work reliably with the 
proprietary NVIDIA driver. The kernel parameter acpi_sleep=s3_mode did not help 
too. 
Nevertheless, the problem seams to be caused by the proprietary NVIDIA driver 
or the interaction of the kernel and this driver. Is there any way to remove 
this driver before suspending? Using the vesa driver is not a real alternative 
as it does not provide 3D acceleration and consumes much more energy from 
battery.

-- 
Thinkpad T61 crashes on resume from suspend
https://bugs.launchpad.net/bugs/192407
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