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/  Forum Index
   /  Amiga OS4.x \ Workbench 4.x
      /  Can't get 2560x1440 or 3840x2160 working anymore.
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Shamron 
Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 3-May-2016 15:23:12
#1 ]
Member
Joined: 25-Jun-2014
Posts: 15
From: Norway

Hi folks.

Sorry for ressurrecting this thread, but i figured that was better than starting a new one.

I'm trying to use a higher resolution than 1920x1080 on my X1000 with a R9-270X and Samsung U28D590 UHD Monitor. With some fiddling with tooltypes, ddcmode=all/preferred and making custom modes, i get the result on this picture:


It's somehow compressed horizontally? The funny thing is that if i use SGrab to save a screenshot of it and view it in multiviewer, and select 1:1 or zoom in on it even, it's correctly displayed... Anyone got a clue?

For those who can see this facebook post:
https://www.facebook.com/groups/CommodoreAmiga/10153604797544157/?ref=notif¬if_t=like¬if_id=1462164306844116

Here's an imgur link showing it working earlier:


As you can see from this, it worked before and i used either a dvi-hdmi or hdmi-hdmi cable.

2560x1440 and 3840x2140 works without problem on my pc, and it used to work on this X1000 with R9-270X as well. I just can't remember what settings i used in prefs/screenmode on the resolutions or monitor tabs. Funny thing is that the 3840 mode says 1190,47KHz horizontal freq in screenmode prefs now.. weird.

The 2560 shows a horiz freq of 91,57KHz which is above the 90KHz the monitor is able to display with hdmi according to the manual, BUT It worked before with either dvi-hdmi or hdmi-hdmi. This resolution also works on my pc with the same dvi-hdmi and hdmi-hdmi cables i try on my X1000. What have i done wrong on the X1000?

As i said above, i CAn get 2560x1440 and 3840x2160 working, but they're horizontally "squished" or "compressed" somehow. But if i sgrab the screen while testing, and later view it in multiviewer, then either zoom in or select 1:1 display mode, it's displayed correctly. This tells me the gfxcard sends all the gfx, but the monitor lacks like 100 pixels horizontally. Or maybe it's something to do with Horizontal sync or blanking? i don't know.

Please help.

Last edited by Shamron on 03-May-2016 at 03:32 PM.
Last edited by Shamron on 03-May-2016 at 03:31 PM.
Last edited by Shamron on 03-May-2016 at 03:31 PM.
Last edited by Shamron on 03-May-2016 at 03:30 PM.
Last edited by Shamron on 03-May-2016 at 03:29 PM.
Last edited by Shamron on 03-May-2016 at 03:27 PM.
Last edited by Shamron on 03-May-2016 at 03:25 PM.

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Hans 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 3-May-2016 21:12:33
#2 ]
Elite Member
Joined: 27-Dec-2003
Posts: 5066
From: New Zealand

@Shamron

I'm not sure how you managed to get it working before, but I posted a reply to you over on Amigans.net (link) that explains what's happening.

A few possible workarounds:
- Use the VGA output instead of DVI/HDMI (avoids the single-link clock speed limit)
- Drop the refresh rate to 30/40 Hz or so. This drops the pixel clock. NOTE: Not all monitors support this

Hans

_________________
http://hdrlab.org.nz/ - Amiga OS 4 projects, programming articles and more. Home of the RadeonHD driver for Amiga OS 4.x project.
https://keasigmadelta.com/ - More of my work.

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olegil 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 4-May-2016 9:24:33
#3 ]
Elite Member
Joined: 22-Aug-2003
Posts: 5895
From: Work

@Hans

HDMI doesn't have the same silly (or at least arbitrary) clock limitation that DVI does, so if he was using HDMI-HDMI rather than DVI-HDMI then that COULD explain how it worked.

Edit: I see you mostly covered this on the other site

Surely this could be up to the user in this case, by clicking "I really really want a single link because my monitor is really HDMI even though it's connected through DVI"

Last edited by olegil on 04-May-2016 at 09:27 AM.

_________________
This weeks pet peeve:
Using "voltage" instead of "potential", which leads to inventing new words like "amperage" instead of "current" (I, measured in A) or possible "charge" (amperehours, Ah or Coulomb, C). Sometimes I don't even know what people mean.

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Shamron 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 4-May-2016 14:06:09
#4 ]
Member
Joined: 25-Jun-2014
Posts: 15
From: Norway

Finally, i got it working. I couldn't remember what cable and config i used, and both the manual, common sence and posts here suggests that DVI is no chance, HDMI is almost there, but Displayport is the way to go.

I couldn't get ANY picture at all with Displayport. A forum post i found, said DP wasn't supported yet, but it was an old post. It may be supported now.

With HDMI i got the horisontal "squishing" show on the above pics, i tried 3 different HDMI cables, from 20$ to one that costed 200$ (i worked there, i didn't pay that price) but no luck.

As a last resort, i tried the DVI to HDMI... Lo and behold... it worked!



detect settings automatically, and i got both 2560x1440 and 3840x2160 workingin both 16 and 32 bits mode.

I knew the 4K res was too high though, and the machine became really sluggish, but at 2560x1440, it's nice.

Thanks to everyone that replied.

(412412 million edits to get the pic to display a thumb linking to a larger pic. I never remeber..)

Last edited by Shamron on 04-May-2016 at 02:42 PM.
Last edited by Shamron on 04-May-2016 at 02:14 PM.
Last edited by Shamron on 04-May-2016 at 02:13 PM.
Last edited by Shamron on 04-May-2016 at 02:12 PM.
Last edited by Shamron on 04-May-2016 at 02:11 PM.
Last edited by Shamron on 04-May-2016 at 02:09 PM.

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Alloye 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 5-May-2016 17:26:41
#5 ]
Member
Joined: 3-Oct-2015
Posts: 41
From: Colorado, USA

Quote:
As a last resort, i tried the DVI to HDMI... Lo and behold... it worked!

I just discovered the same thing while setting up an R9 280X and Dell U2515H. The card, HDMI cable, and monitor all tested fine at 2560x1440@60Hz on a PC, but I couldn't get past 2048x1152@60Hz when I moved them over to my X5000. Then I tried a DVI-to-HDMI cable and the native mode came up fine.

It also seems to matter which DVI output I use. My 280X has two. One will only give me 2048x1152 (same as HDMI). The other is working fine at 2560x1440.

In my case, the monitor didn't display a squished image. It just popped up a notice saying the input timing was unsupported. Results were the same whether using DDC-detected or manually-entered 2560x1440 modes.

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olegil 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 6-May-2016 7:45:24
#6 ]
Elite Member
Joined: 22-Aug-2003
Posts: 5895
From: Work

@Shamron

So there's DVI at the computer end and HDMI at the monitor?

I'll freely admit I just don't see how that can be the right combination to make it work, given my knowledge of DVI and Hans' comments about the driver.

But it's tough to argue against reality

_________________
This weeks pet peeve:
Using "voltage" instead of "potential", which leads to inventing new words like "amperage" instead of "current" (I, measured in A) or possible "charge" (amperehours, Ah or Coulomb, C). Sometimes I don't even know what people mean.

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Alloye 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 6-May-2016 8:07:40
#7 ]
Member
Joined: 3-Oct-2015
Posts: 41
From: Colorado, USA

@olegil

Quote:
So there's DVI at the computer end and HDMI at the monitor?

That's exactly how I got it to work with my setup. Strange but true.

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SinanG 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 6-May-2016 9:04:33
#8 ]
Regular Member
Joined: 24-Dec-2004
Posts: 334
From: Unknown

@Alloye

Quote:
So there's DVI at the computer end and HDMI at the monitor?
That's exactly how I got it to work with my setup. Strange but true.


I have a Wide Screen LG connected to my X5K + Radeon R7 265 (which also has 2 DVI ports)

I also tried using DVI to HDMI cable, but I can't get a proper display at 2560 x 1080.

I can get proper 2560x1080 resolution on same X5K with Ubuntu 16 Linux...

Is it possible to share your monitor file ? or which HDMI port are you using (the one near to HDMI or the one below) ?


_________________
AmigaOS4 Beta-Tester
----------------------------------
Amiga X5000 8GB Radeon RX 560
Amiga A1222 2GB Radeon RX 550
Sam 460 2GB RadeonRX 550

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Alloye 
Re: Can't get 2560x1440 or 3840x2160 working anymore.
Posted on 6-May-2016 17:49:15
#9 ]
Member
Joined: 3-Oct-2015
Posts: 41
From: Colorado, USA

@SinanG

My 280X is a dual-slot card. The outputs on the first slot are DisplayPort, HDMI, and DVI. The second slot has just DVI. It's the standalone DVI that is working at 2560x1440@60Hz. The one next to the HDMI port gives me the same results as HDMI-to-HDMI and won't go past 2048x1152.

I don't have access to my monitor file at the moment, but I do know I'm using DDCMODE=All without any custom mode entries.

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