[Bug 92685] [i915 Skylake] HDMI output does not work with some adapters

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92685

--- Comment #29 from Jim Harvey <wb8nbs at prodigy.net> ---
(In reply to Jim Harvey from comment #28)
> I have this exact problem. Old computer used two vga monitors, I just built
> a new computer and trying to use the old monitors. Mobo is Asus TUF Z270
> Mark 2 with an I5 7600K, OS is Ubuntu 16.04 with kernel 4.10.0-40. 
> 
> Gofanco Active DVI-D to VGA Adapter Converter works well but XF TIMES HDMI
> to VGA
> will fail on a cold boot. Both screens show the Ubuntu purple for a few
> seconds then the HDMI shuts down. Reboot does not start the HDMI side but
> usually a power cycle will.
> 
> DMESG in the failed HDMI condition has this error:
> 
> [    1.668084] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on
> minor 0
> [    1.675364] random: fast init done
> [    1.809723] i915 0000:00:02.0: HDMI-A-1: EDID is invalid:
> [    1.809724] 	[00] BAD  18 ab 1a 3a 5b 3f d0 19 a4 71 db 8e 55 d8 ce a5
> [    1.809724] 	[00] BAD  f6 73 dd d5 de 24 38 3a 09 05 89 72 f5 67 95 b3
> [    1.809724] 	[00] BAD  3e ab 0b f4 b1 ae 10 62 63 eb f8 7b 86 1f 4c e5
> [    1.809725] 	[00] BAD  22 80 86 1c 81 00 1e 7b 12 19 62 d2 5f 79 09 9c
> [    1.809725] 	[00] BAD  bc 2d c1 0d 12 32 6b 03 0c 33 21 81 ff 5d a4 50
> [    1.809725] 	[00] BAD  0e 8b 35 56 ad a8 75 8d a8 e7 31 7e ab 37 35 16
> [    1.809725] 	[00] BAD  b1 0c 10 92 98 74 70 e0 d9 c7 d7 cc 44 e3 bb af
> [    1.809726] 	[00] BAD  38 aa c2 6b 0e d4 e5 a8 0c a0 6d 5f 17 92 01 02
> 
> Otherwise DMESG looks the same when it works or not. I built an xorg.conf
> adding IgnoreEDID but no help, I saw this in Xorg.0.log:
>  [    12.156] (WW) intel(0): Option "IgnoreEDID" is not used
> and no other error messages.


The last thing I see on the screen before the HDMI adapter shuts down is this:

Nov 28 10:20:23 junkbox-2 kernel: [    1.436007] fb: switching to inteldrmfb
from EFI VGA

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