Hello,
On Mon, 18 Mar 2019, Gerd Hoffmann wrote:
A more correct model would probably be to create two i2c busses for
that, then hook up the ddc to one of them (possibly depending on a
config option).
Isn't it enough to only emulate the DVI port DDC then?
Well, strictly speaking the radion has 4 i2c busses and the most correct
way to emulate them is hooking up 4 busses. But in practice it probably
doesn't matter much for the guest whenever we don't emulate the unused
busses or whenever we emulate a i2c bus with no devices connected ...
Right, emulating the ports and corresponding DDC as present but no monitor
connected would be more correct. However we don't emulate the second
display controller or flat panel and there may be cards without additional
connectors so guests should cope with those not present. So unless this
found to cause a problem for some guests I'd keep the code simple for now
and not emulate empty ports. It's a complex enough device without that.
Does it work with the latest patch for you? I could not make Linux driver
recognise the card yet so if you have some settings that's needed for this
you could share those. It may also need changes to vgabios but I'm not
familiar with that so I hope you can help with that. I've found the r128 X
driver needs a VBE BIOS function to access DDC as mentioned in the commit
message.
Regards,
BALATON Zoltan
