[Intel-gfx] [REGRESSION] i915: No HDMI output with 4.4
Oleksandr Natalenko
oleksandr at natalenko.name
Tue Feb 16 10:58:56 UTC 2016
Ville, Daniel,
I've just got another monitor and another DVI-HDMI cable, and here what
I've got.
===Single Link DVI-D cable with 3 different monitors===
Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP65HQ-P
=== not working
Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP67HQ-P
=== not working
Computer DVI ——— DVI-D (Single Link)/HDMI cable ——— HDMI LG 23MP55HQ-P
=== works!
===Dual Link DVI-D cable with monitor that doesn't work with Single Link
cable===
Computer DVI ——— DVI-D (Dual Link)/HDMI cable ——— HDMI LG 23MP65HQ-P ===
works!
===Laptop with HDMI output===
Laptop HDMI ——— HDMI/HDMI cable ——— HDMI LG 23MP65HQ-P === works!
I'd say that single link DVI cables are broken with new kernel, but one
of monitors could work with such a cable. So I have no idea :(.
Regards,
Oleksandr.
15.02.2016 17:42, Daniel Vetter wrote:
> The other downside is that it'll make us non-compliant, which was the
> point of this entire ordeal: HDMI spec forbids us from starting any i2c
> transactions when the hpd isn't signalling a present screen.
>
> So maybe we need to buy one of these broken screens.
>
> Oleksandr, what exact model are you using? And any chance that you
> could
> test this on some other machine with intel gfx and latest kernel, just
> to
> make sure this really is some issue with the sink and not with the
> machine
> itself? And I guess you've tested with some other hdmi sink, and that
> works?
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