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?
** Changed in: ubuntu
Sourcepackagename: xserver-xorg-video-ati => None
Status: Incomplete => New
** Summary changed:
- screen flickers every 10 seconds
+ [intrepid] KDE4: screen flickers every 10 seconds
--
[intrepid] KDE4: screen flickers every 10 seconds
https://bugs.launchpad.net/bugs/279719
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