[Bug 16055] Blank screen with Radeon 9600 / RV350

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=16055





--- Comment #10 from Alex Deucher <agd5f at yahoo.com>  2008-05-22 11:24:26 PST ---
(In reply to comment #8)
> Oh, man this is annoying.
> 
> With 1280 on DVI-0, making the the appropriate changes in xorg.conf, it does
> work. Colors are fine, everything looks happy.
> 
> But 2560 on DVI-0 won't work, because only DVI-1 has the dual-link connection
> necessary to drive the monitor at that resolution. I checked this: without the
> Virtual line, I get a blank screen as before, with the driver attempting to use
> the weird 1152x864 mode again. (As a side note, this time, the driver said the
> DPI was set to 96,96, not 53,76 as when on DVI-1.) When I tried 2560 on DVI-0
> with the Virtual line, I got another computer reset.
> 
> Being able to run at 1280 makes my computer usable, at least, but
> unsurprisingly, I'd very much like to be able to get it to run at 2560 ...
> 

The basic root cause of this (barring the xserver picking the wrong mode), is
that the bios does not appear to set up the external TMDS encoder to work in
duallink mode.  The driver attempts to set up the encoder, but it doesn't
appear to work in your case.  This may also explain the reboot as the external
TMDS encoder is hanging off some unknown GPIO on the radeon.  Unfortunately,
without knowing what chip is used and how it's connected, there's not much we
can do.


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