Comment # 21
on bug 99801
from Jean-Yves Avenard
Adding some likely unhelpful info. But I've had similar (though not the same) problem since I got this screen. However, unlike most comments, I do not get two steady, mis-aligned image on each half of the screen. The effect is an enormous flickering, mostly on the left half, with colour cycling. The screen internal menu can no longer be displayed. Any long exposure to that mode would cause seizure to any healthy person. The only work around to get out of that mode is to disable one of the screen and set the remaining half to 2560x1440 resolution only. Typically, after entering this corrupted mode, the screen will flicker continuously sometimes for hours. One day, I even thought I broke the screen as it was still flickering one day later and got HP to replace it. The new model did that same thing (actually all 4 HPz27q I got, as it took a while to get one without stuck pixels) I get the same effect with both a mac pro 2013 (dual AMD D500 aka AMD 7800) or with a PC with an AMD Vega 64. I'll take a picture of what it looks like and upload.
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