Comment 49 for bug 205653

I have the same issue (system frozen with capslock and scrolllock flashing). I did some research a month or so ago and found some pointers to GLX so I disabled screensavers and shutdown at night. Last night I left the system on but doing nothing - the only apps open were Eclipse and Terminal - no email, no torrent, or other network apps (however, the update manager was on and reports updates available now). When I switched on the monitor I was greeted by the now-familiar 'snow' (looks like a crappy TV signal) on the screen and flashing lights on the keyboard. Time to hit reset.

I don't have the RT61 card - but I suspect there is a family resemblance:
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
        Subsystem: Micro-Star International Co., Ltd. Unknown device 369c
        Flags: bus master, fast devsel, latency 0, IRQ 19
        I/O ports at d800 [size=256]
        Memory at f9fff000 (64-bit, non-prefetchable) [size=4K]
        Expansion ROM at f9fc0000 [disabled] [size=128K]
        Capabilities: <access denied>