[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 15:29:55 PDT 2008


Alex Deucher <agd5f at yahoo.com> changed:

           What    |Removed                     |Added
                 CC|agd5f at yahoo.com             |

--- 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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