I have the same issue with nvidia kernel but nouveau works fine.
Only an Alt-Sysrq-B gets any response even in recovery mode for 2.6.35-14-generic kernel.
Fortunately, I still had a mainline kernel (2.6.34-020634-generic) from testing before I upgraded to Maverick from Lucid.
This kernel in recovery mode allowed me to get back in to set nouveau as the driver.
I have the same issue with nvidia kernel but nouveau works fine.
Only an Alt-Sysrq-B gets any response even in recovery mode for 2.6.35-14-generic kernel.
Fortunately, I still had a mainline kernel (2.6.34- 020634- generic) from testing before I upgraded to Maverick from Lucid.
This kernel in recovery mode allowed me to get back in to set nouveau as the driver.
I reported this in the duplicate bug /bugs.launchpad .net/ubuntu/ +source/ nvidia- graphics- drivers/ +bug/616626
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