Arch Linux

d3vilguard

Member

Registered: 2022-01-01

Posts: 7

[SOLVED] Monitor overclock fail

Happy new year guys!
I am trying to overclock my 60hz 1080p monitor. In Windows I am able to overclock it to 72hz.
I am using an AMD 580 4gb. I've been reading the wiki a lot but can't seem to resolve my issue. What I am doing is:

[d3vil@ArchLinux ~]$ cvt 1920 1080 70
# 1920x1080 69.92 Hz (CVT) hsync: 78.80 kHz; pclk: 204.25 MHz
Modeline "1920x1080_70.00"  204.25  1920 2056 2256 2592  1080 1083 1088 1127 -hsync +vsync

[d3vil@ArchLinux ~]$ xrandr --newmode "1920x1080_70.00"  204.25  1920 2056 2256 2592  1080 1083 1088 1127 -hsync +vsync

My output is "HDMI-A-2 connected primary 1920x1080+0+0"

[d3vil@ArchLinux ~]$ xrandr --addmode HDMI-A-2 "1920x1080_70.00"

[d3vil@ArchLinux ~]$ xrandr --output HDMI-A-2 --mode "1920x1080_70.00"
xrandr: Configure crtc 0 failed

Running  xrandr --output HDMI-A-2 --mode "1920x1080_70.00 blacks out my screen for a second and I get the crtc 0 error.

I recon X sees that the monitor goes only to 60hz and refuses to set 70? Using this method I was able to add a custom resolution of 1440x1080@71. Doing 1920x1080@72 is possible under windows. What I've been reading during my research is something about "EDID information from the monitor" and being able to tell X to not bother with that.

Any help is appreciated

Last edited by d3vilguard (2022-01-01 16:58:22)

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KDE / Linux-TKG BORE / mesa-minimal-git / 5800X PBO / Viper 4x8 4000 (3600@14) / RX6800

seth

Member

Registered: 2012-09-03

Posts: 52,328

Re: [SOLVED] Monitor overclock fail

% cvt12 1920 1080 72 -b
# 1920x1080 @ 72.000 Hz Reduced Blank (CVT) field rate 72.000 Hz; hsync: 80.424 kHz; pclk: 160.85 MHz
Modeline "1920x1080_72.00_rb2"  160.85  1920 1928 1960 2000  1080 1103 1111 1117 +hsync -vsync

1920x1080@60 straight has a pclk of 173.00 - try to stay below that value w/ your modelines.
However, the monitor also has to accept the modeline, otherwise it'll silently reset to 60Hz or switch off, you're not dealing w/ a CRT here.

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d3vilguard

Member

Registered: 2022-01-01

Posts: 7

Re: [SOLVED] Monitor overclock fail

Thank you seth. That solved the problem. I'd like to add for newbies like me that they need the tool cvt12. I fount it in the AUR (cvt12-git).

Topic can be closed.

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KDE / Linux-TKG BORE / mesa-minimal-git / 5800X PBO / Viper 4x8 4000 (3600@14) / RX6800