Re: Matrox G550, dual head, 1680x1050

[Petr Vandrovec <vandrove@vc.cvut.cz>]

Hans-Jürgen Koch wrote:
> Am Freitag, 2. März 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?)

If you are using mga driver for second head in X, then probably X driver 
does not know correctly what are hardware restrictions for second CRTC 
(I think they've changed between G400 and G450), asks for 1680 but gets 
1664, and this causes those diagonal lines you see.
								Petr


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