Acer XB280HK has incorrect EDID.

The EDID does not appear to be correct for this monitor, and that will cause issues under Linux. (It works fine in Windows.) The EDID lists:
Vertical Scan Range : 30Hz-70Hz
which is incorrect. I believe it should be 24Hz-70Hz.

As a result if you are using onboard Intel video that maxes out at 4K@24 Hz, in Fedora 20 Linux it will get the 30Hz minimum back on the Vertical Scan range and not work.

In addition, when using Intel onboard video, the monitor does not appear to support normal VESA resolutions through EDID.

I can't see the BIOS screens, for example.

I was able to get it to work after Linux is booted using this addition to xorg.conf:

Modeline "3840x2160_24" 209.760 3840 3888 3920 4000 2160 2163 2168 2185 +hsync -vsync

Will you offer an EDID fix to existing owners to further increase the compatability of this monitor?

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Ryanrr

ax,

I am sorry but I do not see any utilities available to update this models EDID or plans to update the EDID. If there are any plans or utilities released in the future, they will be provided through our Acer support page for that model.

bugmenot

Hi, thanks for posting the fix. How did you come up with those numbers? when I execute

cvt 3840 2160 24

I get

# 3840x2160 23.99 Hz (CVT) hsync: 52.59 kHz; pclk: 266.75 MHz
Modeline "3840x2160_24.00" 266.75 3840 4056 4456 5072 2160 2163 2168 2192 -hsync +vsync

ax

Those numbers are from the EDID of the monitor.

The difference is that the EDID has it at 533.25 Mhz for 60hz.

As far as I can tell, the only other 4K rate it supports is 24Hz.

The modeline I gave is pretty specific to fixing the Intel onboard video on CPUs that can't do 4K x 60 Hz, but can do 4K x 24 Hz.

I can't remember how I did the math to get from 533 Mhz to 209. I may have used a modeline calculator based on all the other numbers.

bobskye

Hi,

Thank you for your post, can you copy/past configuration file of xorg.conf ?

TheDynamo

For 60hz you need to enter the following:

modeline: "3840x2160_60" 533.250 3840 3888 3920 4000 2160 2163 2168 2222 +hsync -vsync

Now if you can work out how to get movies to play without screen tearing i will be a happy chap Smiley Happy

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