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Re: Tiling display support

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On 20/12/2020 00:42, Dan Ritter wrote:
> George Shuklin wrote:
>> On 12/18/20 9:55 PM, Dan Ritter wrote:
>>> George Shuklin wrote:
>>>> I continue to choose hardware carefully, and the next issue (I found a lot
>>>> on it) is support for tiling displays. They uses multiple streams inside
>>>> DisplayPort to achieve high resolution with high frame rate. It's called MST
>>>> (vs classic single SST), and I found few people complaining about issues
>>>> with it. All those complains are relatively old (2+ years).
>>>>
>>>> Does someone run desktop with 4k screen and high frame rate (150 fps+)? What
>>>> monitor and gpu are you using? Are you having any issues?
>>> There are no 4K 150Hz monitors currently commercially available.
>>>
>>> There are some 4K 120Hz monitors, starting at $800 or so.
>>>
>>> What is your use case?
>>>
>>> -dsr-
>> Oh, thanks, I've reread specs. It says 'refresh rate up to 240Hz', but for
>> full resolution it's 5120 x 1440 | 60 Hz. There is LG, which promises 3840 x
>> 2160 144Hz. I'll be more careful.
>>
>> Anyway, my concern is MST support in Linux. Or, can 4k 120Hz fit through a
>> single DP (SST mode)?
>
> The Radeon 6900XT has DisplayPort 1.4.
>
> The NVidia 2080GTX has DisplayPort 1.4.
>
> DP 1.4 supports 4K at 120Hz.
>
> DP 2.0 has not yet shown up.
>
> What are you trying to do?
>
I had made a mistake assuming the monitor I'd chosen supported 4k at 
240Hz (it was announced as 4k and 240Hz). After answers from the 
maillist I've rechecked specs and found it's only 60Hz at full res, and 
240Hz is there for lower resolutions. So, that thing is dead. There is 
no 4k @ 240Hz.

The next issue is notice from Nvidia site about my video cart saying 
that it supports tiling displays only through direct double DP link (two 
cables with no hub of multiplexers). I start to read about tiling 
support in Linux and found tons of pain (which was slightly eased with 
newer posts about --monitor abstraction in xrandr). Instead of absorbing 
all that pain I've asked here if someone is using tiled display under 
Debian.

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Thread

Tiling display support George Shuklin <george.shuklin@gmail.com> - 2020-12-18 20:50 +0100
  Re: Tiling display support Dan Ritter <dsr@randomstring.org> - 2020-12-18 21:00 +0100
    Re: Tiling display support deloptes <deloptes@gmail.com> - 2020-12-19 00:00 +0100
      Re: Tiling display support Steven Mainor <steve@degga.net> - 2020-12-19 05:40 +0100
      Re: Tiling display support Joe <joe@jretrading.com> - 2020-12-19 10:00 +0100
        Re: Tiling display support Steven Mainor <steve@degga.net> - 2020-12-19 11:40 +0100
    Re: Tiling display support George Shuklin <george.shuklin@gmail.com> - 2020-12-19 21:30 +0100
      Re: Tiling display support Dan Ritter <dsr@randomstring.org> - 2020-12-19 23:50 +0100
        Re: Tiling display support George Shuklin <george.shuklin@gmail.com> - 2020-12-22 14:10 +0100
          Re: Tiling display support Dan Ritter <dsr@randomstring.org> - 2020-12-22 15:30 +0100
      Re: Tiling display support Mark Allums <maa@allums.com> - 2020-12-20 08:50 +0100
        Re: Tiling display support Steven Mainor <steve@degga.net> - 2020-12-20 10:20 +0100

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