Intel ARC A770 + 4K 144Hz monitor — only 60Hz

seth · 2025-10-18 07:33:14

bash: xdpyinfo: command not found

https://archlinux.org/packages/extra/x8 … -xdpyinfo/

If 620mm x 349mm is correct you're at 160dpi but the resolution didn't change at all?

but everything is soooo small, when i set the different scale - the quality of image became lower, idk how to explain tbh

Maybe link two photos of the monitor (please don't embed huge pictures here)

WorMzy · 2025-12-28 23:51:38

Submitted as a report, rather than a reply:

pavelatl wrote:

i have 4k with with 144hz but quality of image is lower, fonts and corners is a bit ugly...
seems like i found something
in Windows everything working perfectly 4K+144Hz and when i turn my pc on i see a splash screen with monitor mode when system is booted. So, here is what it's saying:
Windows - DP 3840x2160@144.0Hz H:315.6KHz PCLK: 1264.8MHz FreeSync Range 48-144Hz
Arch - DP 3840x2160@60.0Hz H:133.6KHz PCLK: 532.8MHz FreeSync Range 48-60Hz
Arch (with video=DP-1:3840x2160@144D in my linux.conf) - DP 3840x2160@144.4Hz H:338.8KHz PCLK: 1833.1MHz (no FreeSync Range line)
Why PCLK is so different with 4K144Hz between Windows and Arch?
sudo cat /sys/kernel/debug/dri/0/DP-1/i915_dsc_fec_support
DSC_Enabled: yes
DSC_Sink_Support: yes
DSC_Output_Format_Sink_Support: RGB: yes YCBCR420: yes YCBCR444: yes
DSC_Sink_BPP_Precision: 16
DSC_Sink_Max_Slice_Count: 8
Force_DSC_Enable: no
FEC_Sink_Support: yes
im using XE driver with KDE
and my conf is:
options root=PARTUUID=aea98516-39f1-415d-988b-a4e1ca13e71e zswap.enabled=0 rw rootfstype=btrfs intel_iommu=on iommu=pt xe.force_probe=56a0 i915.force_probe=!56a0 video=DP-1:3840x2160@144D

Code tags added for readability.

seth · 2025-12-29 15:35:52

Why PCLK is so different with 4K144Hz between Windows and Arch?

This is the naive cvt mode

# 3840x2160 @ 144.000 Hz (CVT) field rate 143.936 Hz; hsync: 338.249 kHz; pclk: 1829.25 MHz
Modeline "3840x2160_144.00"  1829.25  3840 4192 4624 5408  2160 2163 2168 2350 -hsync +vsync

This is cvt1.2 reduced blanking

# 3840x2160 @ 144.000 Hz Reduced Blank (CVT) field rate 144.000 Hz; hsync: 333.216 kHz; pclk: 1306.21 MHz
Modeline "3840x2160_144.00_rb2"  1306.21  3840 3848 3880 3920  2160 2300 2308 2314 +hsync -vsync

The windows modeline is from the edid, https://bbs.archlinux.org/viewtopic.php … 1#p2267121
Which you're apparently no using (possibly because of the video=DP-1:3840x2160@144D) - however we added the mode in https://bbs.archlinux.org/viewtopic.php … 0#p2268150 and the objection to that was

but everything is soooo small, when i set the different scale

which is completely unrelated to your most recent post.

Remove the "video=DP-1:3840x2160@144D" parameter, post the output of

xrandr --verbose

explicitly add the add the desired mode again, post the output of

xrandr --verbose

afterwards.
About the "soooo small" thing we're still lacking the xdpyinfo output.

nb. all of this only makes sense on x11, we'll deal w/ gnome/wayland afterwards.

Arch Linux

#26 2025-10-18 07:33:14

Re: Intel ARC A770 + 4K 144Hz monitor — only 60Hz

#27 2025-12-28 23:51:38

Re: Intel ARC A770 + 4K 144Hz monitor — only 60Hz

#28 2025-12-29 15:35:52

Re: Intel ARC A770 + 4K 144Hz monitor — only 60Hz

Board footer