On Tue, Jul 22, 2008 at 4:03 AM, Luc Verhaegen
On Mon, Jul 21, 2008 at 06:20:17PM -0400, Alex Deucher wrote:
On Mon, Jul 21, 2008 at 6:07 PM, Sven Lankes
wrote: On Mon, Jul 21, 2008 at 11:53:01PM +0200, Luc Verhaegen wrote:
This looks like TMDSA load detection not working. Luc, can you look into this when you find the time?
You will find that, when you run rhd_conntest, the monitor only at certain times puts loads on the digital lines. We have seen the same problem with some other monitors...
This is a Dell 24" - pretty common I'd say.
So it is a problem with not the TMDSA load detection, but with the monitor attached to it, and a suitable strategy still needs to be proposed here.
Pardon my ignorance but how does the radeon-driver handle this?
radeon uses ddc to detect the presence of a monitor, and then (for DACs at least) falls back to load detection if ddc fails.
Alex
How do you distinguish between the DAC and TMDS parts on DVI connectors then?
We check the digital bit in the edid if the connector is DVI-I. if it's digitial, it's TMDS, otherwise, it's DAC.
Also, hpd, with some quirks for the cards that, even though the hardware was there and is solid, didn't provide any HPD information through atombios (R5xx), tends to be rather solid.
Right, at least on r5xx cards, the hpd information in the bios is not always reliable, but the ddc i2c info is.
DDC has proven to be a gamble as well, as monitor manufacturers aren't as great as ATI is at making hardware.
I realize ddc isn't always reliable, but it seems to work more reliably than load detection in my experience. Alex -- To unsubscribe, e-mail: radeonhd+unsubscribe@opensuse.org For additional commands, e-mail: radeonhd+help@opensuse.org