@Steffen Goetz: You are right, the bug is definitely still there. Actually today when I was working on the second monitor, I keep getting compiz crashes with the "intel_do_flush_locked failed: No space left on device" message, triggered with Alt+tab switching... I don't know if anything had changed (updates etc.) since I posted the message. Hope a solution can be found soon. I will try alexus' suggestion now.
@Steffen Goetz: You are right, the bug is definitely still there. Actually today when I was working on the second monitor, I keep getting compiz crashes with the "intel_ do_flush_ locked failed: No space left on device" message, triggered with Alt+tab switching... I don't know if anything had changed (updates etc.) since I posted the message. Hope a solution can be found soon. I will try alexus' suggestion now.