Is it possible to distinguish between HDMI and DVI in i915?

Is it possible to distinguish between HDMI and DVI in i915?

[Arkadiusz Drabczyk]

My Asus Z97-A motherboard has DVI and HDMI connectors but i915 shows
2x HDMI ports (and the 3rd one for DP but a separate DP1 is also
shown). Would it be possible to distinguish between DVI and HDMI in
the driver code for example by reading some undocumented VBT registers
or testing port characteristics or something?
-- 
Arkadiusz Drabczyk <arkadiusz@drabczyk.org>

Re: Is it possible to distinguish between HDMI and DVI in i915?

[Jani Nikula]

On Mon, 20 May 2024, Arkadiusz Drabczyk <arkadiusz@drabczyk.org> wrote:
> My Asus Z97-A motherboard has DVI and HDMI connectors but i915 shows
> 2x HDMI ports (and the 3rd one for DP but a separate DP1 is also
> shown). Would it be possible to distinguish between DVI and HDMI in
> the driver code for example by reading some undocumented VBT registers
> or testing port characteristics or something?

Please file a bug as described at [1], attach dmesg with drm.debug=14
and VBT as described in the link, and we'll be able to tell you more.

Thanks,
Jani.


[1] https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html



-- 
Jani Nikula, Intel