AutoDim: fix timing problems with standby (#9315)
AutoDim: fix timing problems with standby (#9315)

Fix #9303.
koreader/koreader,Frenzie/koreader,Frenzie/koreader,koreader/koreader,NiLuJe/koreader,NiLuJe/koreader,poire-z/koreader,poire-z/koreader