unloading glx & dri on the fly

[[LoN]Kamikaze]

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I'm using a Thinkpad R40 2722-5MG with a Radeon Mobile 7500.

Since I activated the dri and glx modules in my xorg.conf x freezes
after waking up from S3. Is there a way unload them on the fly?

Also if I use the standby button (Fn-F4) /etc/rc.suspend and
/etc/rc.resume are not executed. If I use # acpiconf -s 3 they are
executed properly.
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