Re: opening the framebuffer device

[Helge Hafting]

subramanyam yenugonda wrote:

> Hi All!
>
> How to open the frame buffer device if user has
> multiple monitors on single video card.
>
> Thanks in advance.
> ~YSM
>  
You open the _correct_ framebuffer device.
Linux support multiple framebuffer devices, e.g.
/dev/fb0  /dev/fb1 /dev/fb2 ...

The matrox G550 support this, set the correct kernel config options
and you get both /dev/fb0 and /dev/fb1 (for the second head.)

This is the way to go if you want _independent_ monitors.

Some other drivers create a large framebuffer that spans several
monitors - ideal for the common case of one big desktop spread
across several monitors.  In those cases, you open /dev/fb0,
and find the different monitor bitmaps at different offsets inside that 
file.

Helge Hafting
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