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RayDude
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Joined: 29 May 2004
Posts: 2083
Location: San Jose, CA
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 Posted: Sun Dec 08, 2024 2:05 am Post subject: amdgpu 120Hz? |
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I jut got a new monitor that does 120 Hz.
But the amd gpu driver indicates it only goes to 60 Hz in the kde display settings dialog.
I've been googling, but so far I haven't found the voodoo.
Anyone have any ideas?
Update: RX6650XT is hdmi 2.1 compliant, so it should work.
I found a thread where people were using DisplayPort to HDMI 2.1 converters to run 120 hz...
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Ralphred
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Joined: 31 Dec 2013
Posts: 664
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| Posted: Sun Dec 08, 2024 3:19 am Post subject: |
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| Is a 120Hz modeline mentioned in xorg.log? |
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RayDude
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Joined: 29 May 2004
Posts: 2083
Location: San Jose, CA
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| Posted: Sun Dec 08, 2024 7:05 am Post subject: |
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| Ralphred wrote: | | Is a 120Hz modeline mentioned in xorg.log? |
xrandr does not report 120Hz as an option.
EDID doesn't not report 120Hz as an option.
But someone who has a similar Samsung TV did get it to work with an Nvidia card.
I have found a huge thread that stared three years ago and was active last month that states that HDMI will not license version 2.1 for open source software.
Most got around it by using a DisplayPort 1.4 to HDMI 2.1 cable, so I ordered one.
I did find a website that generates modelines and I tried all four that it generated for 4K@120Hz and each time xrandr reported "Configure crtc 0 failed"
This is similar to the problem when I switched to 4K almost eight years ago. I was running 4K 30Hz interlaced because the monitor required yuv420 to do 60 Hz at 4K.
I'll get it eventually.
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sebas86
Guru
Joined: 01 May 2005
Posts: 570
Location: Szczecinek / Szczecin
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| Posted: Sun Dec 08, 2024 3:00 pm Post subject: |
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I saw an article about the license issue, it's a problem with HDMI Alliance – AMD cannot provide support for all features in the open source drivers… You can try closed source drivers to solve this issue.
https://www.phoronix.com/news/HDMI-2.1-OSS-Rejected
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RayDude
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Joined: 29 May 2004
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Location: San Jose, CA
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| Posted: Tue Dec 10, 2024 8:06 pm Post subject: |
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I bought a Display Port to HDMI 2.1 converter and that still won't run 120 Hz.
EDID doesn't even list 60Hz as an option and it runs at 30 Hz by default.
I did get 60 Hz to work by using xrandr to add a new display mode, but I can't get 120Hz to work the same way.
I found out the display does 144 Hz as well, so I'll try that tonight.
I'd love to hear from someone who got it to work.
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wanne32
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Joined: 11 Nov 2023
Posts: 70
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| Posted: Wed Dec 11, 2024 4:15 pm Post subject: |
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HDMI beyond 60Hz is a tricky thing. So is HDMI with its 100 optional features that have to be supported by Screen, PC and Cable in general. I would highly recommend going to DP. (Full not only with an adapter.)
The other thing that many monitor producers tend to do is going around the 60Hz limit on HDMI 1.2-2.0 by using G-Sync/Adaptive-Sync/FreeSync. So you won't get higher refresh rates until you turn it on (In the settings of your screen. You do not need to enable it on your PC.) – Even if you are using HDMI 2.1 or DP cables. |
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RayDude
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Joined: 29 May 2004
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Location: San Jose, CA
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| Posted: Wed Dec 11, 2024 5:18 pm Post subject: |
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| wanne32 wrote: | HDMI beyond 60Hz is a tricky thing. So is HDMI with its 100 optional features that have to be supported by Screen, PC and Cable in general. I would highly recommend going to DP. (Full not only with an adapter.)
The other thing that many monitor producers tend to do is going around the 60Hz limit on HDMI 1.2-2.0 by using G-Sync/Adaptive-Sync/FreeSync. So you won't get higher refresh rates until you turn it on (In the settings of your screen. You do not need to enable it on your PC.) – Even if you are using HDMI 2.1 or DP cables. |
The TV only supports HDMI 2.1. There is no DP port on it.
The DP to HDMI 2.1 adapter I bought top review talks about it working with 4K 120 Hz TVs in linux.
I will get this to work, it's just a matter of time.
Thanks for the freesync hint. I'll see what I have to do to get AMDGPU to activate freesync.
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Anon-E-moose
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Joined: 23 May 2008
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Location: Dallas area
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| Posted: Wed Dec 11, 2024 5:29 pm Post subject: |
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Your first post is misleading because you say monitor not tv, they are different, and the answers you get will be different.
On my smart tv, I have 4 hdmi, 2 of which are for 60hz and the others will handle 120-144hz, look at the manual for the tv connections.
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RayDude
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Location: San Jose, CA
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| Posted: Wed Dec 11, 2024 6:12 pm Post subject: |
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| Anon-E-moose wrote: | Your first post is misleading because you say monitor not tv, they are different, and the answers you get will be different.
On my smart tv, I have 4 hdmi, 2 of which are for 60hz and the others will handle 120-144hz, look at the manual for the tv connections. |
Thanks. You are right I should have specified TV.
I checked and all HDMI inputs support up to 144 Hz. The panel itself is 120 Hz at 4K.
I'll keep plugging away at it.
Thanks for taking the time to reply.
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