74 lines
2.1 KiB
Markdown
74 lines
2.1 KiB
Markdown
# Modify EDID, so my screens work at 61Hz
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Trying to fix some what high power draw of RX 7900XT(to make its memory run cooler).
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## XOrg
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Put below config in `/etc/X11/xorg.conf.d/09-displays.conf`(also attached as file in `/X11/09-displays.conf`).
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```
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Section "Monitor"
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Identifier "DisplayPort-0"
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Modeline "1200p_61" 196.53 1920 2048 2256 2592 1200 1201 1204 1243 -HSync +Vsync
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Option "PreferredMode" "1200p_61"
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EndSection
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Section "Monitor"
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Identifier "DisplayPort-1"
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Modeline "1440p_61" 317.24 2560 2744 3024 3488 1440 1441 1444 1491 -HSync +Vsync
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Option "PreferredMode" "1440p_61"
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EndSection
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Section "Monitor"
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Identifier "DisplayPort-2"
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Modeline "1200p_61" 196.53 1920 2048 2256 2592 1200 1201 1204 1243 -HSync +Vsync
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Option "PreferredMode" "1200p_61"
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EndSection
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```
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Then restart X session and from system settings set new resolution.
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## Wayland(Gnome/KDE)
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In this case, there are 2 options. First is to pass `video` kernel parameter(but it does not work for me) and other is to modify EDID so it contains addidional resolution data.
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### Modifying EDID
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https://askubuntu.com/questions/973499/wayland-how-to-set-a-custom-resolution
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```bash
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# Install nessesary packages
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sudo apt install zsh edid-decode automake dos2unix
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# Clone tools
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git clone https://gitea.wrzooz.pl/repaste/edid-generator.git
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cd edid-generator
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# Prepare new edid files
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./modeline2edid ../RX7900XTPowerDrawFix/Wayland/displays.modelines
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make
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# Place EDID files in target location
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sudo mkdir /usr/lib/firmware/edid
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sudo cp 1200p_61.bin /usr/lib/firmware/edid/
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sudo cp 1440p_61.bin /usr/lib/firmware/edid/
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# Add those files to initramfs so driver can load them
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cp ./Wayland/displays-edid /usr/share/initramfs-tools/hooks/displays-edid
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sudo chmod +x /usr/share/initramfs-tools/hooks/displays-edid
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sudo update-initramfs -u
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# Make kernel use that files
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sudo nano /etc/default/grub
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#add drm.edid_firmware=DP-1:edid/1200p_61.bin,DP-3:edid/1200p_61.bin into GRUB_CMDLINE_LINUX_DEFAULT
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sudo update-grub
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```
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### Testing
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https://wiki.archlinux.org/title/Kernel_mode_setting#Forcing_modes_and_EDID
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## Links
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https://davejansen.com/add-custom-resolution-and-refresh-rate-when-using-wayland-gnome/
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