Comment 2 for bug 279719

This doesn't seem to be radeon related, perhaps it's xrandr related:

Same thing for me on Intel i945GM with KDE running.

Platform is a FSC Lifebook T4210 convertible notebook (= tablet PC), using an Intel Centrino Duo platform, and it seems to be related to some software used in, or configuration of, a running KDE session.

The bug wasn't present in Gutsy Gibbon. It may have appeared in a somewhat milder form on Hardy Heron.

X configuration: dual-screen in clone mode with 1024x768 resolution (native of integrated panel), external display using TDMS-1 pipe (i. e. DVI-D via docking station), also 1024x768 (native would be 1600x1200).

KDM's login screen does not flicker on either display (shown on both), but gives a steady image on both.

Short after login, while KDE 4.1 is starting up, after the splash screen has disappeared, i. e. once the desktop has appeared (even if some more applications are loading into the panel), my second screen (external TDMS-1 in my case) flickers and blanks periodically, exactly every 10 seconds, until I switch to a single-monitor display with "xrandr --output LVDS --off".

I recall that "xrandr --query" flickered the screen _once_ in Hardy Heron - not sure if it's related.

Is there anything in KDE or window managers or configuration managers or something else that polls display configuration every 10 s, or calls xrandr, or uses R&R primitives, or otherwise might interfere with proper performance of the display?