Just updated to golden goose yesterday. Had silly goose prior to upgrading and everything worked fine to my knowledge.
Adjusting sound works with the normal buttons fine. The popup bar at the bottom shows the sound icon and the bar moves and sound responds as it should.
Flip the trimui toggle and try to adjust brightness. The popup bar appears, shows the brightness icon and the bar increases and decreases with each button press but the brightness does not change.
Adjusting the brightness in the settings menu works fine though.
A few more tests reveals that if i do this in the config screem where sound and brightness are shown, the sound value changes in both modes regardless of what the pop-up bar shows. The brightness remains static.