[Linux-fbdev-devel] Matrox G550, dual head, 1680x1050

[Michel Dänzer]

On Mon, 2007-03-05 at 07:33 +0100, Geert Uytterhoeven wrote:
> On Sun, 4 Mar 2007, Petr Vandrovec wrote:
> > Hans-Jrgen Koch wrote:
> > > Am Freitag, 2. Mrz 2007 16:24 schrieb Tilman Sauerbeck:
> > > Meanwhile I doubt this explanation. Here's what fbset has to say:
> > > 
> > > $ fbset -fb /dev/fb1 --show
> > > 
> > > mode "1680x1050-60"
> > >     # D: 135.501 MHz, H: 65.396 kHz, V: 59.997 Hz
> > >     geometry 1680 1050 1680 1050 32
> > >     timings 7380 32 224 32 4 136 4
> > >     rgba 8/16,8/8,8/0,8/24
> > > endmode
> > > 
> > > So, even fbset thinks it's 1680x1050. But where does the distortion come 
> > > from???
> > 
> > Can you try setting vxres for second head from 1680 to 1696, or 1728? 
> > Maybe X look at vxres and not at framebuffer line length (what fbset -i 
> > reports for line length?)
> 
> These days at least the X server in Debian looks correctly at the frame buffer
> line length, else it wouldn't work on PS3 with non-fullscreen modes.

It depends on the driver. The fbdev and radeon drivers should handle it
correctly, not sure about others.


-- 
Earthling Michel Dänzer           |          http://tungstengraphics.com
Libre software enthusiast         |          Debian, X and DRI developer