[Bug 269606] black screen after monitor wake up

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=269606

            Bug ID: 269606
           Summary: black screen after monitor wake up
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: dufresnep@zoho.com

Using XFCE4 with:
vgapci0@pci0:0:2:0:     class=0x030000 rev=0x00 hdr=0x00 vendor=0x8086
device=0x3e91 subvendor=0x1043 subdevice=0x8694
    vendor     = 'Intel Corporation'
    device     = 'CoffeeLake-S GT2 [UHD Graphics 630]'
    class      = display
    subclass   = VGA
No graphic card connected.

When leaving the computer alone, after a while, monitor led goes yellow (rather
than green) to indicate it is sleeping.

Pressing a key resume computer, led goes green, but the screen stay black with
cursor in upper left flashing.

I have to Alt-F3 (or similar) to go to text mode and then screen reappears.

After that, returning to graphical tty (Alt-F8 I think), returns to XFCE
windows.

Using intel driver:
kldstat shows:
 4    1 0xffffffff83010000   17f8b8 i915kms.ko

paul@dufresnep:/usr/home/paul $ freebsd-version ; uname -a
13.2-PRERELEASE
FreeBSD dufresnep.ca 13.2-PRERELEASE FreeBSD 13.2-PRERELEASE #0
stable/13-n254363-d07eb716f35d: Sat Feb  4 19:16:12 UTC 2023    
root@releng3.nyi.freebsd.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC amd64

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