Bug#697727: xserver-xorg-video-radeon: [radeon] Scrolling in xterm slow with KMS

[Michel Dänzer]

On Die, 2013-01-08 at 23:20 +0100, Tilo Schwarz wrote: 
> 
> Scrolling in an x-term is much slower than before (it is clearly
> noticeable by eye).
> 
> Investigation shows, that scrolling is about 5 times slower when KMS is on.
> 
> A "time seq 100000" takes about 12 seconds with
> "options radeon modeset=1" in /etc/modprobe.d/radeon-kms.conf.
> 
> A "time seq 100000" takes about 2-3 seconds with
> "options radeon modeset=0" in /etc/modprobe.d/radeon-kms.conf.
> 
> xterm and rxvt show the same effect.

[...]

> [    56.923] (II) RADEON(0): KMS Color Tiling: enabled

Sounds like https://bugs.freedesktop.org/show_bug.cgi?id=34486


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer