ati and 2 monitors with 2 different resolutions : is it possible ?

[Alex Deucher]

On Mon, Jan 5, 2009 at 2:53 PM, giggz <giggzounet at gmail.com> wrote:
> Alex Deucher a écrit :
>> On Mon, Jan 5, 2009 at 1:42 PM, giggz <giggzounet at gmail.com> wrote:
>>> Hi,
>>>
>>> Happy new year!
>>>
>>> I have a question :
>>> on my laptop (debian sid), I have a second monitor on the VGA output.
>>>
>>> I don't have any problem on the VGA output when the monitor has the same
>>> display resolution (1400x1050) as the LVDS monitor.
>>> But when my second monitor has a lower resolution (1024x768), I can have
>>> a correct "clone" mode : on the second monitor I have a part of the
>>> "big" one (a rectangle 1024x768).
>>>
>>> Is there something to do ?
>>
>> What exactly are you trying to do?  With clone mode you can have
>> either dis-similar modes on each head (1400x1050 on one, 1024x768 on
>> the other) or a common mode on both heads (e.g., 1024x768 on both).
>>
>> Alex
>
> Hi,
>
> I'm trying to have dis-similar modes on each head (1400x1050 on one,
> 1024x768 on the other) in clone mode...but it doesn't work.
>
> I have my main screen (LVDS) in 1400x1050 and my second (VGA) in
> 1024x768. But on the VGA one, I don't have my complete desktop, just a
> part of it (a rectangle, which its size is 1024x768 of the complete
> image (1400x1050)).

It does work.  1024x768 is smaller than 1400x1050 so you won't be able
to see all of the larger screen on the smaller one.  As Rafal
suggested you could down-scale the image on avivo class hw (r5xx and
newer), but the ati driver doesn't currently support downscaling.
Pre-avivo chips (r1xx-r4xx) only support upscaling.

Alex