OS/2, eCS & ArcaOS - Technical > Hardware

Someone tried OS/2 with 3840x2160 Display?

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Andi B.:
All my ArcaOS subscriptions has expired since a while so I'm not on current level. I have Panorama 1.06 or 07 or something like that which worked well for systems which are not supported by SNAP until now. I've bought more than one ArcaOS license in case someone wonders.

I'm testing on my Asus H87-Pro which offers 3 digital monitor interfaces. These 3 digital interfaces where one of the main reasons I bought this board a few years ago. At that time I planned to use 2 or 3 1920x1200 monitors digitally connected to this board. Unfortunately SNAP still does not support the Haswell integrated Intel HD4600 graphic. So I've to use Panorama with this system.

Now other possibilities than MultiMonitor setups are came to mind. With a big monitor and 3840x2160 resolution (max. on this board with 60Hz) I could replace 2 of the 24" 1920x1200 monitors. Of course this only works with DisplayPort.

As the 27" Eizo runs fine with 2560x1440 resolution I was confident 3840x2160 would work to. But then I tested my sons Samsung with 3840x2160 and that did not work. I don't know if it's a problem with Panorama or maybe this is another Samsung model with crippled/wrong EDID information like one of Dariusz Samsung. Should have checked that while testing...

Andi B.:
After I bought the iiyama X4372UHSU-B1, 42.5" I tried a lot to get OS/2 to work with 4k resolution. Two tickets at AracNoae and a lot of support from David but it does not work with my integrated BIOS and HD4600 graphic. And it does not work with 2 PCIe ATI cards I tried which I had laying around. They all of course can drive this monitor with native resolution under other OSes but not with our Panorama.

Today I got a my new Sapphire Pulse Radeon 550 2G card. The cheapest I found with standard DisplayConnector. And now it works :-) I've OS/2 - ArcaOS running with 3840x2160 resolution at 60Hz refresh rate at this 42.5" monitor.

As David summed up on the Arca Noae wiki it needs a not to old graphic card BIOS to get such configuration to work. And some luck. And of course Display Port connection. Maybe some very new HDMI connector with proper cable will do it too. Older HDMI can't handle the bandwidth. Anyway for computer monitors DP is much preferred.

Andreas Schnellbacher:

--- Quote from: Andi B. on April 17, 2020, 01:35:31 pm ---With a big monitor and 3840x2160 resolution (max. on this board with 60Hz) I could replace 2 of the 24" 1920x1200 monitors. Of course this only works with DisplayPort.

--- End quote ---
BTW: The newer HDMI standard supports this as well. Since a few months most mainboards have HDMI connectors only. It was the opposite a few years ago.

Martin Iturbide:
Hi Andi B.

That's awesome, I want to include a post about it on the OS2World wiki.

According to what I read you are using:
- iiyama PROLITE X4372UHSU-B1 42.5"
- Sapphire Pulse Radeon 550 2G card (Is the link the right one)
- ArcaOS 5.0.6 with lastest Panorama, right?
- It works with the DisplayPort plug.

What about the HDMI and DVI ports of the card (according to the picture I can see on the video card site), are those useless?

It this right? Let me know anything you may want to add about the configuration on ArcaOS.

Regards

Andi B.:

--- Quote ---According to what I read you are using:
- iiyama PROLITE X4372UHSU-B1 42.5"
- Sapphire Pulse Radeon 550 2G card (Is the link the right one)
- ArcaOS 5.0.6 with lastest Panorama, right?
- It works with the DisplayPort plug.
--- End quote ---
Yes, correct. Additionally it runs on another partition with updated eCS. But probably very recent Panorama too. Maybe older Panorama works but I don't know. I bought my card here https://www.e-tec.at/details.php?artnr=%20301295 for 69 €.


--- Quote ---What about the HDMI and DVI ports of the card (according to the picture I can see on the video card site), are those useless?

--- End quote ---
DVI can't handle the bandwidth per definition. So there's no sense to try it out with resolutions over 1920x1200 (x1450). I haven't tried if the graphic card BIOS handles dual-link DVI which may allow up to 2560x1440. But definitely not 4k. So I see no point in even trying that with this monitor. Remember we do not have multi-monitor mode with Panorama. And we will never get multi-monitor mode using different screen resolutions even when SNAP would support this chip. To my thinking one monitor with 3840x2160 is even better then two monitors each 1920x1200 which I have on my other system. See picture.

HDMI - I tested a few other cards with HDMI but without success. Remember you need very recent HDMI version (2.x?) to support 4k. It often works with Win with 30Hz refresh rate but not with OS/2. Seems the graphic card BIOSes do not support these special case (30Hz) very well so Panorama can't use it. This new card may work with HDMI as it has HDMI 2.0. But HDMI is the consumer toy interface. Remember HDMI officially does not even define 1920x1200. Although in theory it could handle it since the beginning it is practically available only since about 2010 - more than 10 years after DVI supported such resolutions. HDMI is for television sets and blue-ray players which needs copy protection. There's no good reason to use it for computer monitors.

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