The brightness level should be set to the current brightness level, not 0 or 100, necessarily.  If brightness is automatically set, it should change as the brightness level adjusts automatically.

Manually changing the value from this screen should take effect immediately, and turn off the auto checkbox.

Moving to the product SqueezePlay because this bug appears to apply to any
player based on that application code.  Feel free to move it back if it's
specific to the single original product.

Comment from Raphael:
Bug 12632: Not exactly sure what Dean is talking about, but I think this is fixed. (at least on the Baby)
- brightness level is set to max with empty/new config
- disable automatic mode when changing brightness works as expected

Can QA test/clarify?

Verified fixed

This bug has been marked as fixed in the 7.4.0 release version of SqueezeBox Server!
    * SqueezeCenter: 28672
    * Squeezebox 2 and 3: 130
    * Transporter: 80
    * Receiver: 65
    * Boom: 50
    * Controller: 7790
    * Radio: 7790  

Please see the Release Notes for all the details: http://wiki.slimdevices.com/index.php/Release_Notes

If you haven't already, please download and install the new version from http://www.logitechsqueezebox.com/support/download-squeezebox-server.html

If you are still experiencing this problem, feel free to reopen the bug with your new comments and we'll have another look.