I´ve got the same chipset (CLE266), maybe I can give you another hint...
I am using the ubuntu 3D driver from the linux.via.com.tw (via-unichrome.83.40692.tar.gz) and glxgears tells me 3d/dri works. Your 3D seems to be OK, I dont think you have to change your actual driver. I never used the openchrome driver though because I got a Panel attached via the LVDS Adapter Port, only the via driver works fine for me in this config.
You cant enable the desktop effects because the via driver ist not whitelisted in compiz. You´d have to add your driver to the whitelist in order to get it working.
- Edit the file /usr/bin/compiz
- find WHITELIST="nvidia intel ati radeon i810"
- add your driver (for example: WHITELIST="nvidia intel ati radeon i810 via" - may be "openchrome" for you?)
- Restart X Server (Ctl+Alt+Backspace)
This worked for me and somewhat enabled Desktop Effects, but I got some graphic errors and performance was ugly. I disabled compiz after trying... ;-)
hope this helps,
pgr
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