[Bug 260890] graphics/drm-fbsd13-kmod: display artifacts in xorg (Intel HD Graphics 3000)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260890

            Bug ID: 260890
           Summary: graphics/drm-fbsd13-kmod: display artifacts in xorg
                    (Intel HD Graphics 3000)
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
          Assignee: [email protected]
             Flags: maintainer-feedback?([email protected])

Created attachment 230636
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=230636&action=edit
screenshot

I am seeing rectangular screen artifcats when browsing the web, reading pdfs,
or
basically doing anything.  If I scroll up and down, they also move up and down
as if they belonged to the document.

I can use either intel or modesetting, with or without
graphics/xf86-video-intel
installed, and it makes no difference.  I will attach xorg conf+log for
completeness, but again, it makes no difference whether any of these settings
are present.

Also, I run i3 with compton, and I have tested it three ways.

1. Without compton, artifacts appear occasionally and are an annoyance.
2. Using compton with the xrender backend, artifacts are so severe as to make
the system nearly unusable.
3. Using compton with the glx backend, artifacts appear rarely, then disappear
immediately, as if compton were correcting them.  It is still however an
annoyance, especially during video playback.

I have tested a Linux USB drive to confirm that it is not a hardware issue.
I have not tested FreeBSD current.

sysctl hw.model: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz

uname -v: FreeBSD 13.0-RELEASE-p4 #0: Tue Aug 24 07:33:27 UTC 2021    
[email protected]:/usr/obj/usr/src/amd64.amd64/sys/GENERIC

A screenshot and other command outputs will be attached.

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