Mailinglist Archive: radeonhd (436 mails)

[Luc Verhaegen <lverhaegen@xxxxxxx>]

On Mon, Jul 21, 2008 at 11:44:03PM +0200, Egbert Eich wrote:
> Sven Lankes writes:
>  > (II) RADEONHD(0): rhdRROutputDetect: Output DVI-I_1/analog
>  > (II) RADEONHD(0): FUNCTION: RHDHPDCheck
>  > (II) RADEONHD(0): RHDHPDCheck returned: 1 mask: 1
>  > (II) RADEONHD(0): FUNCTION: DACASense
>  > (II) RADEONHD(0): DACSense: DAC: 0x00
>  > (II) RADEONHD(0): rhdRROutputDetect: Output DVI-I_1/digital
>  > (II) RADEONHD(0): FUNCTION: RHDHPDCheck
>  > (II) RADEONHD(0): RHDHPDCheck returned: 1 mask: 1
>  > (II) RADEONHD(0): FUNCTION: TMDSASense
>  > (II) RADEONHD(0): TMDSASense: Disconnected
>
> This looks like TMDSA load detection not working.
> Luc, can you look into this when you find the time?
>
> Cheers,
>       Egbert.

This happens depending on the monitor. Load detection is not part of the 
DDWG or whatever DVI specification, instead HPD and DDC are being 
depended on. So monitor manufacturers don't always try to put load on 
the digital lines.

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...

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.

It would be a real shame to disable TMDSA load detection, but this seems 
the quickest solution.

Luc Verhaegen.
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