Contrast problem when waking from sleep mode


just got new set up: mac mini running latest os (10.10.5) plugged samsung monitor (model s24d300) hdmi, , when wake system sleep mode screen appears though contrast turned way up.

settings on monitor , within mac mini haven't changed, looks contrast turned up.

fixing unplugging hdmi cable plugging in. use system settings>accessibility>display contrast , turn slider down , fixes it.

strange thing took screen shot on, viewed screenshot after fixing it, , appeared normal. apparently problem correct signal not making it's way monitor upon waking up.

not big deal, still fixed if possible. i've tried various settings on monitor itself, doesn't make difference. hdmi cable perhaps?

appreciated.
 

strange...

migrated system had screen higher resolution on it. did simple resizing of wallpaper shrink new size, , contrast glitch no longer happening.

thing when left program window open glitch wouldn't happen, or if did minor. thought i'd try adjusting wallpaper, , sure enough seems have worked.

hope i'm not speaking here though.
 


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