Comment 69 for bug 1238902

Oh, I didn't notice you were already running 3.13 -- I highly doubt 3.13.x would help. 3.14-rc1 MIGHT but that's a low chance.

An interesting observation is that your BSP engine refuses MMIO writes when coming back from sleep, but it was fine on original boot. We're probably not initializing something we should be... :( [The BSP engine in itself isn't that important -- it's for h264 decoding, but it's an unfortunate indicator.]

And then you end up with a bunch of

[ 5298.803245] nouveau E[ PFB][0000:02:00.0] trapped read at 0x0020ea1200 on channel 0x0000fc33 [compiz[2007]] PGRAPH/DISPATCH/M2M_IN reason: NULL_DMAOBJ

Which eventually kill X as well.

It's not super-clear from your report, but did this work prior to Ubuntu 13.04? If so, can you figure out what kernel version you were using back when it did work?