Bug#443377: xserver-xorg-video-ati: xrandr 1.2 gives wierd coloration on VGA display

[Alex Deucher]

On 9/20/07, Ken Bloom <kbloom at gmail.com> wrote:
> Package: xserver-xorg-video-ati
> Version: 1:6.7.192-4
> Severity: normal
>
> When I configure my laptop (built-in screen resolution 1280x768) to
> display on a projector with the following commands
> $ xrandr --output VGA-0 --mode 1280x1024 --output LVDS --off
> I find that the top 768 rows of pixels are darker than the bottom 256
> rows of pixels, and the bottom 256 rows don't redraw correctly.
>
> If I try
> $ xrandr --output VGA-0 --mode 1024x768 --output LVDS --off
> then the display on the projector is dim, and different areas of the
> screen display with different levels of fadedness.
>

Can you attach the output of xrandr and xrandr --verbose before and
after making these changes?

> I As'm using an ATI Radeon XPRESS 200M card in a Compaq Presario
> v2310us, I had to create the modes in question after plugging in the
> VGA monitor.
> xrandr --newmode "1280x1024"  110    1280 1328 1512 1712  1024 1025 1028 1054
> xrandr --addmode VGA-0 "1280x1024"
> xrandr --addmode VGA-0 "1024x768"
>
> I believe that last command uses the same 1024x768 mode that was
> autodetected by the laptop for its LCD.
>
> I think there may be a related bug in here that the driver never
> detects when I've plugged in the external monitor/projector, and never
> probes the EDID on the external monitor/projector.

XPRESS chips seem to almost always lie about their ddc line.  Can you
try 6.7.193 or ati git head and see if that helps?