Hallöchen! Graeme Gill writes: > [...] > > Hmm. I'm struggling to understand what the graphics driver is > detecting. Why should it be sensitive to one window appearing and > dissapearing out of (possibly) many others on that display ? I don't think that the appearing of windows causes this. dispwin does something that makes the graphics card to suspend/reset/whatever the HDMI output shortly. Ordinary applications don't do this, however, lxrandr (the Lubuntu display configuration tool) exhibits the same behaviour. In other words: There is some action X, and this X is performed by dispcal, dispwin, lxrandr, etc but not by all other applications like firefox or xterm. This action X accesses the graphics card, directly or indirecty. Maybe X it is accessing the VideoLUTs. But I'm really no expert at this. Tschö, Torsten. -- Torsten Bronger Jabber ID: torsten.bronger@xxxxxxxxxxxxxxxxxxxxx or http://bronger-jmp.appspot.com