Intel ValleyView kms console lock up

Matthew Dillon dillon at
Mon Aug 10 10:20:20 PDT 2015

I have seen similar issues on my Acer C720 (haswell based).  Could you run
a test for me?

* comment out your kern.kms_console=0 line so the KMS console is enabled.

* Instead of rebooting or halting from X, as root do a 'killall xdm' to
kill X.
  This should return you to a KMS console.

* Then try rebooting / shutting down from the KMS console.

What I have noticed on my Acer is two things:  First, sometimes when I
start X up I get corruption and have to restart X to get rid of it.  But if
I kldload i915kms first and give the kms console time to initialize, and
THEN start X up, I never get corruption.   And Second, when I try to
shutdown/reboot from X the laptop often locks up.  But if I killall xdm (as
root) to kill X and return to the KMS console, and then shutdown/reboot
from the KMS console, it always works reliably.


On Fri, Jul 31, 2015 at 11:49 PM, Todd Hoover <teachop at> wrote:

> My Asus (Intel N2830  @ 2.16GHz) needs kern.kms_console="0" now.  Without
> this, exiting the X server will lock up tight requiring a long press of the
> power button.  With kms_console off, it shuts down with a black screen on
> the way, but it shuts down ok!
> It is running this snapshot:  DragonFly asus 4.3-DEVELOPMENT DragonFly
> v4.3.0.387.g27b6eee-DEVELOPMENT #0: Thu Jul 30 10:39:15 UTC 2015
> root at  x86_64
> The gui was installed with "pkg install xorg xfce4 xfce4-power-manager
> firefox", acpi_video is loaded and dbus is enabled.
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