Any ideas on why 4s brightness control won't work (not auto brightness)

Within the past week or so my brightness control stopped working. Restored OS but that didn't fix it.  I suppose it is just broken but seems an unlikely failure when everthing else still works.
I've read all the threads on the auto brightness issues and fixes, but this is not that. The brightness slider does nothing with or without auto control on and in a dark room or full daylight.
Anything else I might try short of replace the phone?
Not a huge issue except for the fact that the already short battery life is reduced by no longer being able to reduce the brightness.

If this is just happening on your home wifi, you might want to try unplugging your router for 15 seconds, then pluggint it back in.  Then on your devices, go to Settings>General>Reset and tap Reset Network Settings.  Note: this will erase passwords for previously joined networks so you'll have to rejoin your wifi again.

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