[Nouveau] [Bug 29455] Nouveau TV-out incorrectly detecting load on NV18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29455

--- Comment #8 from Francisco Jerez <currojerez at riseup.net> 2010-08-12 14:04:58 PDT ---
Created an attachment (id=37826)
 View: https://bugs.freedesktop.org/attachment.cgi?id=37826
 Review: https://bugs.freedesktop.org/review?bug=29455&attachment=37826

nouveau_imac_g4_tvout.patch

(In reply to comment #7)
> (In reply to comment #6)
> > Your DCB tables are a little bit unusual... Does your card really have a TV
> > output?
> 
> It's not a normal TV output, but the "mini-VGA video output" on my iMac's back
> allegedly can do s-video and composite output with the help of an adapter:
> http://store.apple.com/us/product/M9109G/A?mco=MTY3ODQ5OTY

Ah, that explains a few things. TV load detection probably fails because in VGA
mode the TV encoder lines aren't even electrically connected to the mini-VGA
port.

Most likely there's a GPIO-controlled switch you have to poke to make TV-out
work: the attached patch is just a wild guess, if it has no effect you could
try to play a bit with the "gpio->line" parameter (values in 7-9 and 2-4 should
be safe).

BTW, do you happen to have access to one of these adapters?

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