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port-evbarm/54026: simplefb fails to sync with 4K monitor

>Number:         54026
>Category:       port-evbarm
>Synopsis:       simplefb fails to sync with 4K monitor
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Feb 28 21:05:00 +0000 2019
>Originator:     Benny Siegert
>Release:        NetBSD 8.99.34 (as of 2019-02-26)
The NetBSD Foundation
NetBSD arm64 8.99.34 NetBSD 8.99.34 (GENERIC) #0: Tue Feb 26 15:55:33 UTC 2019 evbarm
I had this with two machines, an Orange Pi Plus 2E (32 bits) and a Pine A64-LTS (64 bits). The monitor is a Dell P2415Q (4K), connected via HDMI 1.4, so its preferred resolution is 3840x2160 at 30Hz.

During U-Boot (and NetBSD boot), the picture appears OK, but as soon as the NetBSD kernel takes over, the screen loses sync. The picture re-appears for less than a second, then a black screen again. After a while, the monitor displays an error ("current timing is unsupported") and switches off.

If you boot with "nomodeset" on the kernel command line, you get the desired resolution with no flicker.
Boot NetBSD/evbarm on a 4K screen connected via HDMI.

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