It hasn't got some kind of ambient light sensor has it?
FWIW I've just got a new mobile phone and it brightens the display in bright light whilst dimming it in the shade or the dark. I keep putting my thumb over the sensor whilst navigating the menu, which is how I figured out what it was doing as the display seemed to halve in brightness upon sliding it open.
You could try shining a torch at your stereo at night? If there is no light sensor on the unit itself it may of course be taking its cue from the sunlight sensor for the climate control, or the auto lights/wipers sensor. Sorry I can't offer any help with adjusting the brightness, I had an 01Y Octavia but the stereos were a little more basic 8 years ago.
EDIT: You could try asking on over on Briskoda, they're pretty knowledgable on all things Skoda.
Edited by Dave_TD {P} on 07/10/2009 at 03:17
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