Bug#532926: xserver-xorg-video-ati: XRandR multi-monitor: slowness on one screen, acceleration on the other

Arno Schuring aelschuring at hotmail.com
Sun Jun 14 04:07:46 PDT 2009

Alex Deucher wrote:
> Rotation uses the 3D engine so the largest desktop size that can be
> rotated with hardware is limited to the max texture size: 2048x2048
> for your card.  For desktops larger than that, software is used for
> rotation.  1280 + 1920 > 2048.
Ah, I see. That does explain the speed difference between the monitors.
I take it that xv does not use the 3D engine then.

I'll have to go hunting for a new (AGP) videocard, then. And fall back
to using one monitor in the meantime.

> Due current architectural limitations,
> the max size is per-desktop rather than per monitor.
Since I'm thinking about testing the whole kms-thing anyway as soon as
it's in the mainline kernel, is there any chance that the radeon-rewrite
driver does not have this limit?

Thanks for the info,

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