On 2011-02-20 15:15 +0100, Carlo Stemberger wrote: > Package: xserver-xorg-video-nouveau > Version: 1:0.0.15+git20100329+7858345-5 > Severity: normal > > This bug causes an annoying "black flash" every 30 seconds. The flashing might be due to upowerd polling the DRM devices with this frequency, see #613745. Try disabling upowerd, or downgrade upower to the version in squeeze. Cheers, Sven