Bug#439322: xserver-xorg-video-ati: xrandr does not detect VGA monitor

[Alex Deucher]

On 8/29/07, Marcus Better <marcus at better.se> wrote:
> The "monitor-S-video" option didn't work. I just got
>
> (II) RADEON(0): Output S-video using monitor section TV Monitor
> (**) RADEON(0): Option "Ignore" "true"
> (II) UnloadModule: "ati"
> (II) UnloadModule: "int10"
> (II) Unloading /usr/lib/xorg/modules//libint10.so
> (II) UnloadModule: "vgahw"
> (II) Unloading /usr/lib/xorg/modules//libvgahw.so
> (II) UnloadModule: "radeon"
> (EE) Screen(s) found, but none have a usable configuration.
>
> Also the list of modes detected for the VGA monitor is missing the natural
> 1280x1024 mode:
>

I suspect the driver is not able to get an edid for the monitor.  If
it doesn't get one, it'll just end up getting the default modes.  you
can use xrandr to manually add a mode:

xrandr --addmode VGA-0 1280x1024

regarding the edid, two factors could be at work.  Either we are using
the wrong ddc line or we need to adjust the i2c timing a bit.

Alex