[gentoo-user] Xorg 7.0+composite+radeon OSS drivers+radeon9200se : X cpu usage sometimes rockets to > 80%

[b.n.]

Hi,

Today I tried to enable the composite extension on my Xorg. Nice eye 
candy :) and everything works pretty good.

The only problem is that sometimes the CPU usage shots to > 80% for 
intervals of 20-60 minutes (at pretty random intervals, but it seems to 
me that switching desktops a lot helps the bug to come out) and then 
quietly settles out. If I kill xcompmgr the CPU usage instantly comes 
down to almost zero. Restarting composite makes the CPU usage rise again 
to something like 10-20% (it depends), quite high but bearable.

I should be using a fully hw-accelerated Xorg, however. I have an ATI 
Radeon 9200se card with the following options:

[...]
Section "Device"

     #VideoRam    131072
     # Insert Clocks lines here if appropriate
         Identifier  "** ATI Radeon (generic)               [radeon]"
         Driver      "radeon"
         Option "AccelMethod" "EXA"
         Option "AGPMode" "8"
         Option "AGPFastWrite" "1"
         Option "BackingStore" "true"
EndSection
[...]

that, according to http://gentoo-wiki.com/TIP_Xorg_X11_and_Transparency 
, should give most acceleration for my card. What seems strange to me is 
that the problem happens at random (a misconfiguration should fit better 
a constant high CPU usage).

I am using latest stable 7.0 Xorg.

Any idea to help me understand what the problem can be?

Thanks,
m.
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