bash.log

drm_info
```
$ drm_info | grep -i gamma
│   │   │   └───Gamma size: 1024
│   │       ├───"DEGAMMA_LUT": blob = 0
│   │       ├───"DEGAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│   │       ├───"GAMMA_LUT": blob = 120
│   │       └───"GAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│   │   │   └───Gamma size: 1024
│   │       ├───"DEGAMMA_LUT": blob = 0
│   │       ├───"DEGAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│   │       ├───"GAMMA_LUT": blob = 119
│   │       └───"GAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│   │   │   └───Gamma size: 1024
│   │       ├───"DEGAMMA_LUT": blob = 0
│   │       ├───"DEGAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│   │       ├───"GAMMA_LUT": blob = 0
│   │       └───"GAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│       │   └───Gamma size: 1024
│           ├───"DEGAMMA_LUT": blob = 0
│           ├───"DEGAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024
│           ├───"GAMMA_LUT": blob = 0
│           └───"GAMMA_LUT_SIZE" (immutable): range [0, UINT32_MAX] = 1024

$ gammastep -vvv -O 4500
Notice: Brightness: 1.00:1.00
Notice: Gamma (Day): 1.000, 1.000, 1.000
Notice: Gamma (Night): 1.000, 1.000, 1.000
Informational: Using method: 'wayland'
Notice: Color temperature: 4500K
Warning: Zero outputs support gamma adjustment.
Warning: 2/2 output(s) do not support gamma adjustment.
Notice: Press ctrl-c to stop...
^C
# nothing happens try drm
$ gammastep -m drm -vvv -O 4500
Notice: Brightness: 1.00:1.00
Notice: Gamma (Day): 1.000, 1.000, 1.000
Notice: Gamma (Night): 1.000, 1.000, 1.000
Notice: Color temperature: 4500K
# program exits 0, no visual change

gammastep -m randr -vvv -O 4500
Notice: Brightness: 1.00:1.00
Notice: Gamma (Day): 1.000, 1.000, 1.000
Notice: Gamma (Night): 1.000, 1.000, 1.000
Notice: Color temperature: 4500K
# same; no change