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    SubjectRe: [REGRESSION] i915: No HDMI output with 4.4
    On Tue, Feb 16, 2016 at 12:58:56PM +0200, Oleksandr Natalenko wrote:
    > 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

    I presume the above LG screen is what you've called previously "old
    monitor"?

    > 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!

    Funky. Can you pls grab the debug logs (with the special patches from
    Ville) for this case? I wonder why suddenly different cable and it works.

    Also: Is this one of these older-ish screens where you must have a
    dual-link cable to drive it at full resolution&refresh rate?
    -Daniel


    > ===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?

    --
    Daniel Vetter
    Software Engineer, Intel Corporation
    http://blog.ffwll.ch

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