new monitor Acer K242HQK

[Jerry Geis]

I have a new monitor that does 3840x2160 - except it doesn't...

I can get it do display for a little bit, then it goes blank, display again
for a little bit, then blank... It varies as to how long the display will
show before
blank - and varies as to how long its blank.

I have tried selections 3840x2160_60, 3840x2160_50, 3840x2160_30,
3840x2160_24
 339.244] (II) NVIDIA(GPU-0): --- Modes in ModePool for Acer K242HQK
(DFP-1) ---
[   339.244] (II) NVIDIA(GPU-0): "nvidia-auto-select" :
CEA-861B:#97:3840x2160x59.940Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "3840x2160"          :
CEA-861B:#97:3840x2160x59.940Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "3840x2160_60"       :
CEA-861B:#97:3840x2160x59.940Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "3840x2160_50"       :
CEA-861B:#96:3840x2160x50.000Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "3840x2160_30"       : 3840 x 2160 @  30.0
Hz  (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "3840x2160_30_0"     :
CEA-861B:#95:3840x2160x29.970Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "3840x2160_24"       :
CEA-861B:#93:3840x2160x23.980Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080"          : 1920 x 1080 @  60.0
Hz  (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_60"       : 1920 x 1080 @  60.0
Hz  (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_60_0"     :
CEA-861B:#16:1920x1080x59.940Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_50"       :
CEA-861B:#31:1920x1080x50.000Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_30"       :
CEA-861B:#34:1920x1080x29.970Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_24"       :
CEA-861B:#32:1920x1080x23.970Hz/P (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_60i"      :
CEA-861B:#5:1920x1080x59.940Hz/I (from: EDID)
[   339.244] (II) NVIDIA(GPU-0): "1920x1080_50i"      :
CEA-861B:#20:1920x1080x50.000Hz/I (from: EDID)

but all behave the same.
1920x180 works just fine.

I have a HDMI 2.0 cable and NVIDIA GT 720 video card. I use CentOS 6.7 and
NVIDIA
drivers 358.16

Any thoughts on this  ?

Thanks,

Jerry
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