[Bug 250009] graphics/drm-fbsd12.0-kmod: sound unusable on DisplayPort after DPMS or screen OFF/ON.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250009

--- Comment #3 from Jean-Claude MICHOT <jc at michot.fr> ---
unfortunatly that doesn't work.

# devctl disable hdacc2
devctl: Failed to disable hdacc2: Device busy

# dmesg | tail -6

=> power off screen

hdacc2: Unexpected unsolicited response with tag 63: ffffffff
hdacc2: Unexpected unsolicited response with tag 63: ffffffff
uhub4: 4 ports with 4 removable, self powered

=> power on screen

hdacc2: Unexpected unsolicited response with tag 63: ffffffff
hdacc2: Unexpected unsolicited response with tag 63: ffffffff

=> devctl disable hdacc2
pcm5: unregister: mixer busy

I have add a section in /etc/X11/xorg.org

Section "Extensions"
    Option      "DPMS" "Disable"
EndSection


% xset -q | grep DPMS
DPMS (Energy Star):
  Server does not have the DPMS Extension

If i setup the screen save "xset s on" and "xset s activate" a new line: 
"hdacc2: Unexpected unsolicited response with tag 63: ffffffff"
appear in dmesg, and sound disappear. I need to reboot to get sound back.

To keep sound on DisplayPort, i must disable DPMS __AND__ Screen Saver... :(

JC

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