It happened again today with the same kernel and nouveau versions still. And xorg-x11-server-Xorg-1.7.99.901-8.20100223.fc13.x86_64 (forgot to mention this in comment 26).
When it happened, I tried logging out of the GNOME session which caused both monitors to power down until reboot. I'm attaching an excerpt from /var/log/messages at the time it happened and also the Xorg output, while I'm at it.
Created attachment 402070
log excerpt
It happened again today with the same kernel and nouveau versions still. And xorg-x11- server- Xorg-1. 7.99.901- 8.20100223. fc13.x86_ 64 (forgot to mention this in comment 26).
When it happened, I tried logging out of the GNOME session which caused both monitors to power down until reboot. I'm attaching an excerpt from /var/log/messages at the time it happened and also the Xorg output, while I'm at it.