port-amd64/57387: External Monitor corruption, 10.0 BETA

[John McCue <jmclists%jmcunx.com@localhost>]

>Number:         57387
>Category:       port-amd64
>Synopsis:       External Monitor corruption
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 01 18:05:00 +0000 2023
>Originator:     John McCue
>Release:        NetBSD 10.0_BETA
>Organization:
	just me
>Environment:
         see File netbsd_ident.txt in
         https://github.com/jmcunx/nconfig/blob/main/netbsd_ident.txt
System: NetBSD neutron.jmcunx.com 10.0_BETA NetBSD 10.0_BETA (GENERIC) #0: Tue Apr 25 16:17:59 UTC 2023 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:
	Under heavy load, the screen for my External Monitor
         gets corrupted.  The monitor is an ACER Model V276HL.
         This is on a Thinkpad T420.
         https://github.com/jmcunx/nconfig
         contains various configs and a screen print.
         This does not occur when using only the Laptop Screen.
>How-To-Repeat:
	Start a long running process with a high CPU load,
	usually within 1 hour corruption starts.
         Config files with a screen print can be seen in:
         https://github.com/jmcunx/nconfig
>Fix:
	I need kill my background process and restart X,
         I know of no other fix.

>Unformatted:
 	10.0_BETA NetBSD 10.0_BETA (GENERIC) #0: Tue Apr 25 16:17:59 UTC 2023