[Bug 16055] Blank screen with Radeon 9600 / RV350

[bugzilla-daemon at freedesktop.org]

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





--- Comment #12 from Alex Deucher <agd5f at yahoo.com>  2008-05-22 19:55:11 PST ---
(In reply to comment #11)
> Is there any research I can do to help diagnose what needs to be fixed? Some
> kind of tracing of the fglrx driver or anything? Or even a particular function
> in the driver that I can futz with to see if anything helps?
> 

Well, you can identify the chip by looking at the card.  It's probably a
siliconimage chip of some sort (sil-something).  The hard part is figuring out
the gpio line and pins used for i2c to configure the chip.  You may be able to
tell from tracing what the bios or fglrx does when it sets a mode on that
ouput.

As to the radeon driver, take a look at RADEONInitExtTMDSInfoFromBIOS() and
RADEONGetExtTMDSInfoFromBIOS().  The bios has a table for what gpio reg it uses
and the commands to set up the chip, but, I'm not sure how to find out what
pins it uses or what's needed to enable them.  The problem is I think it tends
to vary based on the OEM.  I'll ask around AMD and see what I can find out.


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