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

Sun Apr 27 15:29:55 PDT 2008

http://bugs.freedesktop.org/show_bug.cgi?id=15708

Alex Deucher <agd5f at yahoo.com> changed:

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--- Comment #5 from Alex Deucher <agd5f at yahoo.com>  2008-04-27 15:29:55 PST ---
(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.

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