How to change refresh rate to 120hz?

[MorrowxD]

Hi, i looking for way to change refresh rate from 60hz to 120hz. Didn't find anything so i decided to write here. I use TCL TV connected by HDMI.

[SaulGoodman1337]

Hi,
you may have the same problem as me with my Philips OLED 803.
This TV transmits an incorrect EDID file in which it is also not possible to operate the TV with 1080p or 1440p with 120hz.
However, I was able to operate the TV with 120hz by reading out, modifying and edid override.
If your TV is theoretically capable of running at 120hz but the setting is not suggested to you - then an incorrect EDID file is probably the problem and you will have to patch it.

Here you can find a commit from me on how to load a custom edid via chimeraos.
SaulGoodman1337@bfb9e73

Here would be an edid editor:
https://www.analogway.com/americas/products/software-tools/aw-edid-editor/

and the file is, depending on the port on your system, here:

/sys/class/drm/card1-HDMI-1/edid

I wish you much success!

[MorrowxD]

So it requires to build own image? Maybe i'll try to buy DisplayPort to HDMI Adapter. And what does "Firmaware overrides dsdt edid" in advaced options do?

It's so weird. I installed Chimera OS and connected it via DisplayPort to my 165Hz monitor, and everything was working great. Then, I connected an HDMI cable to my TV. In this scenario, I was able to set the TV screen to 120Hz, but the colors were faded, and I could only play GTA Vice City, other games wouldn't start at all in Steam game mode. Games like Assassin's Creed I could only play in desktop mode. Dirt showdown wont start in game mode and also in desktop mode until i plug out monitor connected by display port so I decided to reinstall the system without the DisplayPort plugged in. In this scenario, the colors are great, but I can't use 120Hz. And the games still won't run correctly in game mode. So, I guess it's an EDID or HDMI issue because everything works great when the 165Hz monitor is connected via DisplayPort. I don't know what to do. Building my own image seems like overkill. I think I'll try to buy a DP Port to HDMI adapter.

[SaulGoodman1337]

Which TV is this exactly?

[MorrowxD]

It's TCL 65QLED870, gpu rx 6800 xt.

[MorrowxD]

I've got this thing to work by connecting to a different port. But now all games are crashing with this error: "pid 100934 != 10933, skipping destruction (fork without exec?)" Has anyone had this?

[SaulGoodman1337]

I've got this thing to work by connecting to a different port. But now all games are crashing with this error: "pid 100934 != 10933, skipping destruction (fork without exec?)" Has anyone had this?

do you try to use 4k at 120hz and HDR? there are some reports of failure at reddit with pushing more than 40gbit of data through the hdmi 2.1 port.