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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Set custom refresh rate (lemmy.world)

submitted 19 hours ago by user_naa@lemmy.world to c/linux@lemmy.ml

6 comments fedilink hide all child comments

Hello! I am on Fedora 40 KDE Edition (Wayland). I have monitor with two supported refresh rates (60, 50 Hz). How can I set custom refresh rate? I know, on Windows you can use CRU.

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[–] vikingtons@lemmy.world 4 points 18 hours ago (2 children)

You want to look into modifying your display EDID.

I don't believe there's a GUI for this on Linux but this post referencing the Archwiki might come in handy

https://foosel.net/til/how-to-override-the-edid-data-of-a-monitor-under-linux/

[–] user_naa@lemmy.world 1 points 4 hours ago* (last edited 4 hours ago) (1 children)

I added new refresh rate for testing, but after enabling it I just get black screen. How to fix this issue?

[–] vikingtons@lemmy.world 1 points 1 hour ago* (last edited 1 hour ago) (1 children)

I'm sorry to hear that. Does this system only have access to this single display? Did you use a kernel command to modify your EDID? If so, are you able to temporarily modify your grub before booting into the OS?

[–] user_naa@lemmy.world 1 points 17 hours ago (2 children)

In this guide author dumped edid from disaplay and then loaded it without any modifications. So after reloading edid you can choose any resolution? Or I understood something wrong?

[–] SteveTech@programming.dev 4 points 16 hours ago

I think you'd have to modify the edid, since you're setting a custom refresh rate, not a hidden one.

I've use wxEDID to force enable VRR before.

[–] vikingtons@lemmy.world 1 points 17 hours ago* (last edited 17 hours ago)

Archwiki references a [@<refresh>] (presumably denoted as [@144] for something like 144Hz) property, hopefully that's all you should need to define, though I'm not sure if you'll need to manually recalculate vertical and horz timings or something.

Maybe this can help fill in any gaps

https://tomverbeure.github.io/video_timings_calculator