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Old 01-10-06, 01:42 AM   #1
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Default vesafb-framebuffer and multiheaded graphicadapters


I try to get framebuffer (standard vesafb in kernel) to work with my
multiheaded graphicadapter (nvidia card with dual-dvi). Principially it
works. The problem is, that it seems that the kernel-included vesafb
checks the EDID of *both* the dvi-ports. One of those dvi-ports is
connected to my projector, which is only capable of few, low resolution
modes. As soon as I unplug the projector, everything works as intended
(with my other device, a Samsung LCD-display). It makes no difference,
on which of the two dvi-ports the projector sits, vesafb always checks
both of them and refuses to work if the projector is connected (it is not
enough to turn the projector off, it has to be physically disconnected).

Is there any way to disable activation of framebuffer on one of those
dvi-ports? Of course I only need it on the port where my LCD-display is
connected, but there seems to be no option to specify this?

Another option would perhaps be to use vesafb-tng and to disable
EDID-checking, but perhaps there is a more elegant solution. I also
would rather like to solve the problem without patching the kernel. I
need use of framebuffer on only one of the ports, is this theoretically
possible (standard-console or no console output whatsoever on one
port, framebuffer-video on the other)?


Last edited by airflow; 01-11-06 at 01:40 AM. Reason: bumping...
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Old 01-13-06, 12:25 PM   #2
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Default Re: vesafb-framebuffer and multiheaded graphicadapters


I tried the vesafb-tng instead of the kernel-standard vesafb in the meantime. I set the "noedid"-option to make sure that the resolution is set when the projector is connected. Even this way I can't get the framebuffer to work when both devices (LCD and projector) are connected. 640x480 works, but any resolution higher is not possible. When I disconnect the projector, it works.

I also tried the utility fbset. Same here. As long as only the TFT is connected, I can set all resolutions I want, back and forth. Connecting the projector, too, leads to the errormessage "ioctl FBIOPUT_VSCREENINFO: Invalid argument". Searching the internet did not yield usable results for me... Perhaps you have an idea?

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