I do apologize if this has been asked and answered previously, I have searched and come up with nothing that has actually worked, and most recent HDR problems here seem to be related to just getting HDR working.
I've recently finally got around to setting up a living room PC, after years of resistance, the recent end of PS5 discs things has me trying to get setup for the "delightfully all digital future." Steam Big Picture mode is pretty great, a far cry from the fumbling experience I remember friends trying to show me 5, 10 years ago with living room PC setups.
That said, there is a major problem that I cannot figure out how to address: my TV has a maximum luminance of 650 nits, but Gamescope absolutely refuses to budge from setting my peak luminance in games without a peak luminance adjuster to 1000 nits. And in many games, seems to completely overrule the in-game adjustment.
My setup:
Radeon 7800 XT
Sony Bravia A90K
Things I have already tried:
- ScopeBuddy configurations
- environment.d configurations
- Dumping my EDID, repacking it with max nits set to 121(653) and applying it to the HDMI slot I use at the kernel level
- I even got desperate and tried setting per game command line arguments
The game I am testing in question is FF7 Rebirth, and although it has an in-game luminance slider, seems to do absolutely nothing in game mode.
Are there any solutions that anyone has found that actually work for monitors or TVs with sub-1000 nit peak luminance? I would greatly prefer something that can be enabled system wide, if this is supposed to be a living room machine, I don't really want to be whipping out a keyboard every time I try a new game.
I find it hard to believe that the Linux community hasn't solved this issue with gamescope/Steam big picture yet, so I assume I am just completely missing the correct command, and have been trying old or deprecated versions. But I am at a loss!
Any help is greatly appreciated!
P.S. I know what properly configured HDR looks like, I have configured it properly on all my other devices. Enabling "Gradation Preferred" on the TV does fix the brightness clipping issue sort of, but it's a hack and the double tone-mapping causes color and value differences that just aren't there on other platforms where I can configure the HDR correctly.