accelerated radeonfb produces artifacts on scrolling in 2.6.7

[Jurriaan]

The radeonfb driver in 2.6.7 produces some interesting artifacts on
scrolling, both scrolling horizontally and vertically.

When scrolling vertically (in mutt, in slrn, in less) some lines
move horizontally, and corruption occurs. Not all scrolling produces
artifacts, but fairly often.

When scrolling horizontally (most obvious in angband -mcu with the
option 'keep the screen centered' on) corruption appears at once.

Booting with 'noaccel' fixes the problems, but is slow, of course.

0000:01:00.0 VGA compatible controller: ATI Technologies Inc RV350 AQ [Radeon 9600]

Kernel command line: root=/dev/md3 video=radeonfb:1600x1200-16@85
radeonfb: Found Intel x86 BIOS ROM Image
radeonfb: Retreived PLL infos from BIOS
radeonfb: Reference=27.00 MHz (RefDiv=12) Memory=324.00 Mhz, System=182.00 MHz
radeonfb: Monitor 1 type CRT found
radeonfb: EDID probed
radeonfb: Monitor 2 type no found
radeonfb: ATI Radeon AQ  SDR SGRAM 128 MB
Console: switching to colour frame buffer device 133x54

Any hints would be appreciated.

Jurriaan
-- 
All lies all lies all schemes all schemes
Every winner means a loser in the western dream.
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Debian (Unstable) GNU/Linux 2.6.7-rc3-mm2 2x6078 bogomips load load 1.74
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