[darthvader42]

As stated before, I also get a frozen X after some time. Massive webbrowsing or other window activitiy seems to increase the probability of freezing. Just like d3mia7, I get the same strange messages in Xorg.0.log:
(WW) Feb 20 20:13:22 NVIDIA(0): WAIT (0, 6, 0x8000, 0x00003a3c, 0x00003a3c)
(WW) Feb 20 20:13:25 NVIDIA(0): WAIT (0, 6, 0x8000, 0x00003f7c, 0x00003f7c)
(WW) Feb 20 20:13:28 NVIDIA(0): WAIT (2, 6, 0x8000, 0x00004214, 0x00008eac)
(WW) Feb 20 20:13:35 NVIDIA(0): WAIT (1, 6, 0x8000, 0x00004214, 0x00008eac)
(WW) Feb 20 20:13:38 NVIDIA(0): WAIT (2, 6, 0x8000, 0x00004214, 0x0000d15c)
(WW) Feb 20 20:13:45 NVIDIA(0): WAIT (1, 6, 0x8000, 0x00004214, 0x0000d15c)

I observed something interesting: when trying to log in after freezing via ssh from a second machine, X on the W510 gets back to being reponsive again and continues to work. Strange!

If that is reproducable, it might be a first workaround to do a automated ssh login by cron every minute.