Sorry for not having supplied a lot of detailed information on versions used last time - it was just the default Ubuntu 11.10 packages of the moment. I did have the same problem in Debian unstable though, but now it disappeared, and my monitor goes to sleep all right. Some versions:
X.Org X Server 1.11.3.901 (1.11.4 RC 1)
Release Date: 2012-01-06
Sorry for not having supplied a lot of detailed information on versions used last time - it was just the default Ubuntu 11.10 packages of the moment. I did have the same problem in Debian unstable though, but now it disappeared, and my monitor goes to sleep all right. Some versions:
X.Org X Server 1.11.3.901 (1.11.4 RC 1)
Release Date: 2012-01-06
Linux version 3.2.0-1-rt-amd64 (Debian 3.2.6-1)