[Bug 99801] Rx480 doesn't output properly onto z27q at 5120x2880

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Comment # 25 on bug 99801 from
(In reply to Jean-Yves Avenard from comment #21)
> 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.

FWIW, this description is more or less exactly what I'm experiencing on my
display as well. (although I never tried the screen internal menu piece) I
probably just didn't do a good job taking a picture and/or describing it.


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