Originally Posted by hosko
Dam it mine just did the half backlight issue, I left my system on whilst I went to dinner. Came back and the display had been put to sleep, woke it up and was greeted by this.
Not a happy camper.
I've come across a few monitors that have "wake from sleep issues". This glitch is most likely some firmware issue where the monitor power on signal internally gets sent to the LED back-light circuit before the back-light circuit is ready to accept it/aware. It can easily be reset by power/off-on, changing resolution, or powering down your computer and not using sleep mode. Or if you do use sleep mode, just press your monitor power button off then.
But yes, I do agree this should have been caught in testing and could probably easily be fixed in firmware. I suspect the error occurs due to them trying to make the monitor "boot" as fast as possible for convenience.