#1074531 libdrm-radeon1: no power management, external displays, night light or backlight on AMD Radeon 780M

Package:
libdrm-radeon1
Source:
libdrm-radeon1
Description:
Userspace interface to radeon-specific kernel DRM services -- runtime
Submitter:
Vladimir Komendantskiy
Date:
2024-06-30 12:39:04 UTC
Severity:
normal
#1074531#5
Date:
2024-06-30 12:36:39 UTC
From:
To:
The current Radeon driver doesn't fully support the 780M. No external displays
are detected. There is no backlight control - the /sys/class/backlight
directory is empty. Screen brightness controls don't work. Colour temperature
control doesn't seem to work either - xrandr can't access the gamma parameters:

```
xrandr: Failed to get size of gamma for output default
```

Unfortunately the proprietory ROCm driver doesn't support Debian (fails to
build) and the devs there have said that 780M is not a supported ROCm device.