[PATCH] radeon: greyline bug when the screen is not in the flatpanel resolution.

[Sascha Sommer]

Hi,

I wonder if some with knowledge about the radeon driver could take a look at 
https://bugs.freedesktop.org/attachment.cgi?id=7744.

The problem is that whenever I choose a resolution other than 1400x1050 for my
mobility radeon 9700 the most right part of the screen is corrupted and a grey
line occurres on the bottom of the screen. This corruption only happens on the 
Laptop Flat panel. External CRT is fine.

I tracked it down to some rounding differences between the windows driver and 
the radeon driver.


Here are some stats of the register values for different panel sizes:
(First comes the resolution from which we scale up to the flatpanel 
resolution. h is the register value for hscale without and with the patch v 
stands for vscale.

panel 1400x1050
1400x1050 h: 4096 4096 diff 0 v: 4096 4096 diff 0
1280x960 h: 3745 3744 diff 1 v: 3745 3744 diff 1
1280x768 h: 3745 3744 diff 1 v: 2996 2995 diff 1
1024x768 h: 2996 2995 diff 1 v: 2996 2995 diff 1
800x600 h: 2341 2340 diff 1 v: 2341 2340 diff 1
640x480 h: 1872 1872 diff 0 v: 1872 1872 diff 0
panel 1280x768
1280x768 h: 4096 4096 diff 0 v: 4096 4096 diff 0
1024x768 h: 3277 3276 diff 1 v: 4096 4096 diff 0
800x600 h: 2560 2560 diff 0 v: 3200 3200 diff 0
640x480 h: 2048 2048 diff 0 v: 2560 2560 diff 0
panel 1024x768
1024x768 h: 4096 4096 diff 0 v: 4096 4096 diff 0
800x600 h: 3200 3200 diff 0 v: 3200 3200 diff 0
640x480 h: 2560 2560 diff 0 v: 2560 2560 diff 0

The question is if this is only different for my Notebook or if this is a 
generic problem.

Regards

Sascha
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