Here is full dmesg with verbose patch on 4.4.1 and dual-link DVI-HDMI
cable: [1]
Dual-link works OK:
===
лют 16 17:46:38 pfactum.lanet kernel: port C live status
##################################################
##################################################
##################################################
##################################################
##################################################
===
Also:
===
[~]$ sudo intel_reg read 0xc4000 0xc4004 0xc4008 0xc400c 0xc4030
(0x000c4000): 0x00400000
(0x000c4004): 0xf1b4ffff
(0x000c4008): 0x00000000
(0x000c400c): 0xffffffff
(0x000c4030): 0x00101010
[~]$ sudo intel_reg read 0xc2000 0xc2004 0xc2020
(0x000c2000): 0x00000000
(0x000c2004): 0x00000001
(0x000c2020): 0x60004000
===
Let me know if you need more info.
[1] https://gist.github.com/dfbf237e74ed6e0b1bf7
16.02.2016 14:54, Daniel Vetter wrote:
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?
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