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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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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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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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Fuck, I only saw "(Intel iGPU)"…
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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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"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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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
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"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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Ordered a HBR 3 DP cable and now it worksè! Thank you very much
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How can I mark a thread as SOLVED?
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Editing the title in your first post.
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