Is there typically firmware upgrades for monitors like this? Seems to have issues resuming from when Windows turns the screen off. After flickering a bit, the other dual monitor will be set from extended to just the other screen. Restarting the computer fixes the issue, as does changing the Windows settings to Duplicate and then back to Extend. (Using Windows 10 and an HDMI port on a Radeon RX 570 with another 1080p monitor also on HDMI.)

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I also have 2 of these monitors on a Radeon RX 570 (with latest drivers). One is on a display port and the other on HDMI and I have got the same issue on both. One (sometimes both) monitors will not turn on after they go into sleep mode. Then the display settings fall back to 640x480 and I can never switch it back to 3840x2160. I will have to either unplug the monitor's power or restart the machine. Both these options were impractical so my only option was to change the power settings to never put my monitors to sleep. If you find a better solution, please post it here.

Brand	Acer
Model	KG281K bmiipx
Part Number	UM.PX1AA.004
Cabinet Color	Black

Screen Size	28"
Glare Screen	Anti-glare
LED Backlight	Yes
Widescreen	Yes
Resolution	3840 x 2160 (4K)
Refresh Rate	60Hz
Viewing Angle	170° (H) / 160° (V)
Monitor Pixel Density	0.16mm
Display Colors	1.07 Billion
Brightness	330 cd/m2
Contrast Ratio	ACM 100,000,000:1 (1,000:1)
Aspect Ratio	16:9
Response Time	1 ms (GTG)
Panel	TN
Display Type	UHD
Adaptive Sync Technology	FreeSync (AMD Adaptive Sync)

Video Ports	1 x DisplayPort 1.2 / 2 x HDMI 2.0
Input Video Compatibility	Digital
Connectors	HDMI, DisplayPort
HDMI	2 x HDMI 2.0
Thunderbolt 2	No
DisplayPort	1 x DisplayPort 1.2

Power Supply	100 - 240 VAC, 50/60Hz
Power Consumption	Normal Operation: < 34 Watts Off (power-save): < 1 Watts

User Controls	Power On/Off Button
Regulatory Approvals	UL, cUL, FCC Class B, CE, TUV/GS, VCCI, RoHS, MPRII, TCO
Stand Adjustments	Ergonomic Tilt: -5° to 15°
Built-in Speakers	2W x 2
VESA Compatibility - Mountable	100 x 100mm

Acer KG281K bmiipx 28" 4K UHD (3840 x 2160) TN Monitor with AMD FREESYNC Technology (1 x Display Port & 2 x HDMI 2.0 Ports)

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Dimensions	18.98" x 25.94" x 9.49" (with Stand)
Weight	12.10 lbs.

Item#: N82E16824011397