I'm wondering.. do you have your monitors setup in a side-by side configuration? If so, the 1280x1024 and 1280x768 stacked side by side will exceed the 2048 maximum width for certain operations. I just noticed my glxinfo direct rendering reports as off with a wide twin monitor setup (I just turned it on to try and reproduce a different bug).
Can you post the output of the command:
xrandr
I'm wondering.. do you have your monitors setup in a side-by side configuration? If so, the 1280x1024 and 1280x768 stacked side by side will exceed the 2048 maximum width for certain operations. I just noticed my glxinfo direct rendering reports as off with a wide twin monitor setup (I just turned it on to try and reproduce a different bug).