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On first setup (or when a display reports a maximum of 0) the read value was converted using a maxDDC of 0, saving NaN to the prefs. Converting that back to a DDC value traps, crashing the app on the next brightness change. Existing NaN prefs are removed on setup, so affected users recover without resetting their settings.
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When a display shows up under a new prefs id (after wake or re-docking, for example),
setupCurrentAndMaxValuesconverts the DDC value it just read beforemaxDDCis stored. With min and max both 0,convDDCToValuedivides 0 by 0 and the NaN gets saved as the current value. The next brightness change then traps onUInt16(NaN)inconvValueToDDC; themin/maxclamps don't help, as they pass NaN through.This PR stores
maxDDCbefore converting the read value. A display that reports a maximum of 0 falls back toDDC_MAX_DETECT_LIMIT(I've seen an iiyama do this for volume over HDMI), and a NaN that earlier versions already saved is removed, so the value is read again.I reproduced it on 4.4.0 by removing the
maxDDCkeys from the prefs: every command loggedCurrent internal value: nanand the next brightness key press crashed. With this change the same steps give valid values. Probably the same crash as #1919. #1874 also guards against min == max in the conversions, but doesn't cover the ordering or the NaN values already in people's prefs.