I found out why it worked sometimes without double-buffer problems. Actually the problem has already been solved, but I managed to work around this solution ;)
By using insmod on the driver I compiled myself the options set in /etc/modprobe.d/options got completely ignored, however one of them is to enable double-buffering for that driver. So this issue has been fixed already and the only remaining thing to get this bug closed is to apply the patch Simon Munton suggested.
I found out why it worked sometimes without double-buffer problems. Actually the problem has already been solved, but I managed to work around this solution ;) d/options got completely ignored, however one of them is to enable double-buffering for that driver. So this issue has been fixed already and the only remaining thing to get this bug closed is to apply the patch Simon Munton suggested.
By using insmod on the driver I compiled myself the options set in /etc/modprobe.