[arch-general] HDMI Output died over night

[Florian Wehner]

I don’t know why, but it started working today again.

To rule out a hardware failiure the BIOS option to use the HDMI as boot display is good.

And this morning it just worked again?!?! I guess because I brought tho older brother Lenovo X1…

> On Jun 25, 2019, at 22:08, Florian Wehner <florian at whnr.de> wrote:
> 
> Thanks so far! Last two mails collected here.
> 
> First guess: hardware failure?
> 
>> Does the display work at startup? Like does it POST and do you have a boot
>> loader?
> 
> Not on the external screen. That was what I expected for the UEFI setting “Post on hdmi”.
> 
> That could lead to failed port?
> 
>> Do you have another device that you could use to check that the cable and monitor are not the issue?
> 
> Yes. Tested a TV, and a projector.
> 
>> What graphics card are you using and
>> which driver?
> 
> Whatever is installed by default through pacstrap base
> 
>> Awhile ago I believe xf86 video intel was deprecated in favor of mode
>> setting.
> 
> Thanks for pointing that out. I saw that here: https://wiki.archlinux.org/index.php/Intel_graphics#Installation
> 
>> Are you using UEFI?
> 
> Yes. Only. Systems Boot
> 
>> On Jun 25, 2019, at 20:03, Ralf Mardorf via arch-general <arch-general at archlinux.org> wrote:
>> 
>>> On Tue, 25 Jun 2019 19:07:56 -0400, Florian Wehner wrote:
>>> I wasn’t able to get my HDMI output running on my Lenovo X1 Carbon 6th
>>> gen today. I run gnome on Wayland. It has been working fine for the
>>> last few days but completely dead today.
>> 
>> Did an update affect anything?
> 
> Might be. Mesa just got an minor update a few days ago. But I rebooted successfully at least once after updating.
> 
>> I'm using
>>  Driver "intel"
> 
> Where can I find this info?
> 
>> However, the "Multihead" Wiki,
>> https://wiki.archlinux.org/index.php/Multihead, refers to "Related
>> articles" for non-Intel.
>> 
>>> Symptom: The external display detects that an HDMI cable is connected
>>> (via ground?) but there is no signal.
>> 
>> Maybe no signal, but perhaps just +5 V,
>> https://en.wikipedia.org/wiki/HDMI.
>> 
>>> Here’s what I tried:
>>> Switch from wayland to Xorg
>>> [snip]
>>> Looking at xrandr => Not connected
>> 
>> But xrandr shows one or more disconnected HDMI ports?
> 
> Yes. 2 disconnected HDMI ports shown. One cloned with a DP.
> 
> —Flo