I’ve had my headlights in Auto mode since day one with no issue. As for the 2 wheels next to the headlight knob, the left one is interior lights and the right one is dash/radio (so to speak) brightness. Again I’ve had mine set to about midway below the bump with the radio dark/light themes working as advertised. The dash wheel does increase and decrease light intensity as you adjust it regardless if your headlight knob is in Auto or On position. If you go past the bump your radio will stay in the day mode regardless of settings. If your dash lights stay off below the bump you definitely have an issue.
For the Display brightness mode in settings being greyed out. It has nothing to do with the headlight knob it’s because it’s set to auto in the settings. Set it to manual and you’ll be able to adjust them. Turn your headlight knob to on/auto/off/parking position while looking at the settings and you’ll see it has nothing to do with it.
For the Theme mode if it’s set to Light or dark it’s always going to stay that way and in light setting it may be(it is to me) to bright at night. Setting to auto will let it switch when the headlights come on. Only downside I’ve found is during the day when it rains and the lights/wipers come on it can be too dark to see the screen, but you can turn the dash brightness to max(above the bump) and the radio will switch back to the light theme.
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