[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

Jim Harvey <wb8nbs at prodigy.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wb8nbs at prodigy.net

--- Comment #28 from Jim Harvey <wb8nbs at prodigy.net> ---
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.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are on the CC list for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20171127/0c0053b0/attachment.html>