[TN]Randomly black screen with 4K @ 60Hz in Ubuntu 20.04.LTS with two monitors

1. Environment

NUC11TNKv7 - new device

OS: Ubuntu 20.04 LTS - list on support OS.

https://www.intel.com/content/www/us/en/support/articles/000005499/intel-nuc.html

Monitor(s): BenQ EW3270U and Samsung LU32J590UQRXXU

*monitors work perfectly on a separate Windows machine

one of the cables: https://www.amazon.co.uk/gp/product/B00B4CVV60/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

• BIOS: 57

2. Expected Behavior

Ubuntu 20.04 support 4K@60Hz.

3. Actual Behavior

One monitor would frequently cut out (to black) and the other has an image that jumps around'

'issue is present when there is only 1 display, connected on either HDMI port

Please refer attached file for issue.

10. References

TROUBLESHOOTING

Tried multiple different HDMI leads

Attempted to reduce the hz to 30 - Workable

Updated the bios

Tried both the hdmi ports on the NUC

Tried different ports on the monitors

Use USB-C connection - Thunderbolt to HDMI adapter - same issue

BIOS recovery - issue still present

Make sure that the OS updated to its latest version

Modify the IGD Minimum Memory and IGD Aperture Size settings (from Advanced > Devices > Video) to their biggest available option - no effect

Disable the phantom display

Check BIOS Setup for primary and secondary display

Run: xrandr --output HDMI1 --auto

Check the setting for 'Primary Video Port' and 'Secondary Video Port'

Customer verify the issue is not present in windows and it is probably related to UbuntuTNv5-4k-60-Ubuntu21.04