[Bug 15708] VGA-0 can't be activated using xrandr, even though it is properly detected by xrandr -q

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Apr 27 15:49:18 PDT 2008


Charlie Xia <charlie.xia.fdu at gmail.com> changed:

           What    |Removed                     |Added
                 CC|                            |charlie.xia.fdu at gmail.com

--- Comment #6 from Charlie Xia <charlie.xia.fdu at gmail.com>  2008-04-27 15:49:18 PST ---
(In reply to comment #5)
> (In reply to comment #3)
> > More stranger, if i turn it off by 'xrandr --output VGA-0 --off', the LVDS get 
> > resized. my VGA-0 is supposed to run in 1280x1024 and LVDS 1024x768.
> > Hope that gives you more information for judgement.
> > 
> right.  the driver thinks the output is working.  we are just missing some bit
> in the dac init sequence to make the dac actually produce an output.
> > And can you briefly explain what is the GPIO magic? Can I do anything more? or
> > just give up? I actually had put a lot of my time on it and it drove me ;(.
> I think you may have to toggle some gpio pins to switch the dac output between
> the S-video port and the VGA port, but as you are still having problems even
> with VGA connected at boot, I suspect the problem may be elsewhere.  I'll have
> to check the register specs and see if there are any strange quirks with
> certain old IGP chips.

I really expect that you can figure things out, if it is not too painful.
If I can be of any help to you just let me know. And if you come up with any
patch or hack, keep me informed and I will test it ASAP.


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