Fascinating. This has to be the HDMI endpoint because I have run all of
these protocols in weird ways over the last couple of years and the only
one I couldn't make happen was Linux to Thunderbolt target display mode,
but that was a long shot when I started.
The closest I have had with this is my Alienware laptop and that it has a
gsync display, but handily enough it kind of forces the intel GPU to stuff
it.
On Thu, Aug 20, 2020 at 5:26 PM Michael Butash via PLUG-discuss <
plug-discuss@lists.phxlinux.org> wrote:
> I have had lots of issues with video and adapters the past few years,
> mostly as I'm forced to use them. My nvidia 1070 in my desktop has 3x
> DP1.2 ports and 1 HDMI2.0. I have 3 displays, so I use the 3x DP1.2 ports,
> and run those through adapters to HDMI2.0 on my Samsung TV's I use for
> monitors. Non-stop chaos ensues during power-down and up every day,
> something different, every linux desktop hates it. Often one display or
> another will freak out, and I end up; having to hard disconnect the adapter
> (ie, reboot it) to work again or it'll come up stuck in 768x1024 (on a 48"
> tv...).
>
> I found HDMI doesn't handle DPMS sort of power-off modes as vga, dvi, dp,
> or most methods of displays to handle soft power-off scenarios, ala just
> power down displays. When my laptop powers them down, they remain on with
> no signal, which seems to just confuse the video card and adapter that both
> freak out. This seems to have a profound effect on displaya and video
> cards that don't realize most displays are now hdmi...
>
> Graphic subsystems are a basketcase these days under linux, mostly because
> of these damn adapters, dongles
> <https://www.youtube.com/watch?v=-XSC_UG5_kU>, and vendor wars. Intel,
> that wants to sell all the things, including the most useless gpu on the
> earth, injects themselves into everything, and always cause me issues as I
> can't convince the os to use the (real) nvidia gpu. Probably the same sort
> of issue if an intel gpu is around with AMD. Last I used an AMD GPU some
> 4-5 years ago, it was an issue. Nvidia Prime via Intel is still sketchy af.
>
> Even on a dedicated nvidia gpu in a server-ish xeon system, with
> DP-to-whatever adapters I had nothing but issues. My latest iteration is
> my laptop (xps 9560) and a thunderbolt3/usb-c dock with 2x 4k/60hz outputs
> via one-piece DP-to-HDMI cables. I still have quirks, but I've learned to
> work around, and now somewhat understand really odd hardware behaviour
> enough to reproduce it. Occasionally I still need to disconnect a display
> at the DP-to-HDMI cable I use now, which is again oddly random.
>
> I don't like the adapters, but my 48" TV's I use for displays don't often
> come with DP ports native, and using HDMI comes with power management
> oddities. A lot depends on your cabling and even display these days.
>
> -mb
>
>
> On Wed, Aug 19, 2020 at 1:05 PM Seabass via PLUG-discuss <
> plug-discuss@lists.phxlinux.org> wrote:
>
>> No, on the desired monitor, it still black screens.
>>
>> Works just fine (Even without that parameter) on something that has a
>> direct HDMI cable, though. (TV)
>>
>> > Message: 6
>> >Date: Tue, 18 Aug 2020 16:23:47 -0700
>> > From: Aaron Jones <retro64xyz@gmail.com>
>> > To: plugaz@codezilla.xyz, Main PLUG discussion list
>> > <plug-discuss@lists.phxlinux.org>
>> >Subject: Re: KMS but AMDGPU And Black Screen
>> > Message-ID: <6B7D5942-0F2F-4DAE-A54A-19215718DCF2@gmail.com>
>> > Content-Type: text/plain; charset="utf-8"
>> >
>> > https://bugzilla.redhat.com/show_bug.cgi?id=1594488
>> >
>> > Set amdgpu.dc=0 in bios and it will work but without hdmi sound.
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--
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.
Stephen
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