I've tracked this down to mplayer's disabling of DPMS while playing a movie, which means the bug is in the DPMS portion of the X server.
To confirm this: a) in mplayer-1.0~rc2/config.h change #define HAVE_XDPMS 1 to #undef HAVE_XDPMS and rebuild - problem goes away (along with DPMS disabling capability, of course) b) xset -dpms exhibits the same behaviour. -- mplayer and vlc causes backlight to go to full brightness https://bugs.launchpad.net/bugs/204805 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs