[Bug 28960] Screen tearing (some tiles rendered with offset) especially when scrolling etc. in DualHead mode on HD4350

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28960

--- Comment #12 from Grzegorz Wierzowiecki <grzegorz.wierzowiecki at pjwstk.edu.pl> 2010-07-09 10:28:12 PDT ---
> So, does the corruption only appear on the rotated outputs, or also on
> non-rotated ones?

Both screens behaves in same way (to me).


One more detail:
(I don't know if it's  important in this issue)

First -left- column of pixels of right (rotated) screen
is copy of last-right- column of pixels of my left screen.

At my setup, rotated screen is on right side and it's primary.
Setup is made on KDE startup with following autorun script : 

xrandr --output HDMI-0 --off --output VGA-0 --mode 1920x1200 --pos 1920x0
--rotate left --output DVI-0 --mode 1920x1200 --pos 0x332 --rotate normal

This detail is not problem to me, case always I can make a little bit bigger
offset of right screen with xrandr.

I mention this cause it looks strange to me... and maybe somehow connected with
tearing of screen (when Option "AccelDFS" "on"), cause teating is like
rendering/refreshing some parts sometimes with wrong X,Y offset.

Why this column overlapping seems strange to me ?
When width of first screen is 1920, I assume it's Y axes range is [0;1919], so
offset 1920 of second screen (=> range [1920,3119]) should not overlap, but it
overlaps.

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