radeon mergefb with gap

Alex Deucher alexdeucher at gmail.com
Tue Mar 13 06:40:00 PDT 2007

On 3/13/07, Erwin Rol <mailinglists at erwinrol.com> wrote:
> Hey all,
> I am wondering if it is possible to configure the radeon driver in such
> a way that it uses mergefb with a gap between the two displays. What i
> am looking for is to have two 800x600 flat panels next to each other
> with a 1cm gap between them. The gap is about 55 pixel wide, now I would
> want to make a mergedfb that is 1655x600, with the first screen looking
> at 0,0 - 800,600 and the second at 855,0 - 1655,600. I tried "Rightof
> 55" but that shifts the screen down instead of to the right. Is there
> any way to do that ?

There is not currently a way to do this, but you could easily change
that by hacking the driver.  Just add 55 to the x value you pass to
radeonadjustframe() for the crtc you want to adjust.  You'll also have
to set your virtual desktop big enough to accommodate the extra


> TIA,
> Erwin

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