This is probably related to http://www.nvnews.net/vbulletin/showthread.php?t=171226
I'm using mythtv (latest trunk), nv295.09, kernel3.0.14, qt4.7.4
After upgrade to 295.09 my fe (diskless, sleep/resume in S3) every few resumes returns successfully from S3 but hangs with black screen durring mythtv start (mythtv is only gfx app I'm starting as sys is dedicated appliance).
It looks like mythtv process hangs when it touches opengl or vdpau.
No any meaningful info in mythtv.log nor kernel.log - so I can't be more specific. Sorry for that.
Restating mythtv process helps - after that all seems to work OK.