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#1 2024-02-02 20:06:39

RononDex
Member
Registered: 2024-02-02
Posts: 15

[Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

As the title says, is there any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

I confirmed that 4k @ 144Hz works with this exact setup, when booting into windows.
However, on Linux it only allows me to select 4k @ 60Hz for this screen at a maximum.

Funny thing is, that my laptop with a USB-C connection to the same screen on Arch Linux can select 4k @ 144Hz for this screen (Intel iGPU)
But my much more powerful desktop somehow can not.

Output of hyperctl monitors:

Monitor DP-1 (ID 0):
	2560x1440@143.85600 at 2560x0
	description: Ancor Communications Inc ASUS MG279 0x0001CF7A (DP-1)
	make: Ancor Communications Inc
	model: ASUS MG279
	serial: 0x0001CF7A
	active workspace: 1 (1)
	special workspace: 0 ()
	reserved: 0 0 0 0
	scale: 1.00
	transform: 0
	focused: no
	dpmsStatus: 1
	vrr: 0
	activelyTearing: false

Monitor HDMI-A-2 (ID 1):
	3840x2160@60.00000 at 0x0
	description: Acer Technologies XV275K P3 2324000334HA1 (HDMI-A-2)
	make: Acer Technologies
	model: XV275K P3
	serial: 2324000334HA1
	active workspace: 10 (10)
	special workspace: 0 ()
	reserved: 0 22 0 37
	scale: 1.50
	transform: 0
	focused: yes
	dpmsStatus: 1
	vrr: 1
	activelyTearing: false

Output of xrandr (under hyprland):

Screen 0: minimum 16 x 16, current 5120 x 1440, maximum 32767 x 32767
DP-1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 600mm x 340mm
   2560x1440    143.83*+
   1920x1440    143.81  
   1600x1200    143.72  
   1440x1080    143.69  
   1400x1050    143.78  
   1280x1024    143.67  
   1280x960     143.73  
   1152x864     143.75  
   1024x768     143.66  
   800x600      143.48  
   640x480      143.30  
   320x240      142.05  
   1920x1200    143.74  
   1680x1050    143.79  
   1440x900     143.73  
   1280x800     143.84  
   1152x720     143.57  
   960x600      143.72  
   928x580      143.50  
   800x500      143.25  
   768x480      143.69  
   720x480      143.35  
   640x400      143.37  
   320x200      141.40  
   2048x1152    143.74  
   1920x1080    143.72  
   1600x900     143.69  
   1368x768     143.61  
   1280x720     143.67  
   1024x576     143.62  
   864x486      143.23  
   720x400      143.29  
   640x350      143.57  
HDMI-A-2 connected 2560x1440+2560+0 (normal left inverted right x axis y axis) 600mm x 330mm
   2560x1440     59.96*+
   1920x1440     59.97  
   1600x1200     59.87  
   1440x1080     59.99  
   1400x1050     59.98  
   1280x1024     59.89  
   1280x960      59.94  
   1152x864      59.96  
   1024x768      59.92  
   800x600       59.86  
   640x480       59.38  
   320x240       59.52  
   1920x1200     59.88  
   1680x1050     59.95  
   1440x900      59.89  
   1280x800      59.81  
   1152x720      59.97  
   960x600       59.63  
   928x580       59.88  
   800x500       59.50  
   768x480       59.90  
   720x480       59.71  
   640x400       59.95  
   320x200       58.96  
   2048x1152     59.90  
   1920x1080     59.96  
   1600x900      59.95  
   1368x768      59.88  
   1280x720      59.86  
   1024x576      59.90  
   864x486       59.92  
   720x400       59.55  
   640x350       59.77  

Last edited by RononDex (2024-02-11 16:03:29)

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#2 2024-02-02 23:20:00

seth
Member
Registered: 2012-09-03
Posts: 53,130

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

xrandr (under hyprland)

and an empty bag are worth about the value of the bag. xrandr talks to xwayland that gets synthetic information from the compositor.

You can test the behavior on X11 but w/ "vrr: 1" only on that output I suppose it's bc/ of https://wiki.archlinux.org/title/Variab … e#Hyprland

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#3 2024-02-03 06:39:21

spiffeeroo
Member
Registered: 2021-04-23
Posts: 21

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

https://gitlab.freedesktop.org/drm/amd/-/issues/1417

Unfortunately, HDMI 2.1 on Linux is possible on Intel and Nvidia but not AMD at the moment. AMD legal team and HDMI Forum are still negotiating a path forward.

Alex Deucher @agd5f · 3 weeks ago Owner

Yes, discussions are still ongoing.

Your Acer XV275K P3 monitor supports DisplayPort, so you should switch to DisplayPort to get the full specs of your monitor. Otherwise DP-to-HDMI active adapters are hit-or-miss and usually do not support VRR/increase latency.

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#4 2024-02-03 08:57:19

seth
Member
Registered: 2012-09-03
Posts: 53,130

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

Fuck, I only saw "(Intel iGPU)"… sad

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#5 2024-02-03 13:47:11

RononDex
Member
Registered: 2024-02-02
Posts: 15

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

spiffeeroo wrote:

https://gitlab.freedesktop.org/drm/amd/-/issues/1417

Unfortunately, HDMI 2.1 on Linux is possible on Intel and Nvidia but not AMD at the moment. AMD legal team and HDMI Forum are still negotiating a path forward.

Alex Deucher @agd5f · 3 weeks ago Owner

Yes, discussions are still ongoing.

Your Acer XV275K P3 monitor supports DisplayPort, so you should switch to DisplayPort to get the full specs of your monitor. Otherwise DP-to-HDMI active adapters are hit-or-miss and usually do not support VRR/increase latency.

Thanks, that would explain it. Is there any ETA on HDMI-2.1 support for AMD?

The display port on this screen is "only" DP 1.4, which does not have enough bandwidth for 4k 144hz sadly

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#6 2024-02-03 13:52:53

seth
Member
Registered: 2012-09-03
Posts: 53,130

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

"AMD legal team and HDMI Forum"…

DP1.4 should™ alllow you to run 4k@144Hz via HBR3 (possibly even HBR2) and DSC?

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#7 2024-02-03 15:51:13

RononDex
Member
Registered: 2024-02-02
Posts: 15

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

Do I have to do something to turn on HBR and DSC? Or should it work without doing anything?

I will have to try this. Thanks smile

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#8 2024-02-03 15:57:26

seth
Member
Registered: 2012-09-03
Posts: 53,130

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

"cable" (HBR1 won't do, HBR3 is probably a safer bet) otherwise it'll hopefully work ootb - bugs in amdgpu aside.
nb. that DP1.3 will NOT work but you can get 120Hz on HBR3 alone.

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#9 2024-02-07 18:53:53

RononDex
Member
Registered: 2024-02-02
Posts: 15

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

Ordered a HBR 3 DP cable and now it worksè! Thank you very much smile

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#10 2024-02-07 18:55:13

RononDex
Member
Registered: 2024-02-02
Posts: 15

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

How can I mark a thread as SOLVED?

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#11 2024-02-07 19:14:56

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 22,093

Re: [Solved] Any way to get 4k @ 144Hz on 7900XTX with HDMI-2.1?

Editing the title in your first post.

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