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Subject: [Bug 209727] Panic in i915kms on power mode change
Date: Tue, 24 May 2016 07:12:21 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D209727

            Bug ID: 209727
           Summary: Panic in i915kms on power mode change
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: info@juanmolina.eu
                CC: freebsd-amd64@FreeBSD.org
                CC: freebsd-amd64@FreeBSD.org

Created attachment 170587
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D170587&action=
=3Dedit
Picture of the panic

While testing the freebsd-base-graphics/drm-next-4.6 branch with a Haswell =
(HD
4400) GPU laptop, changing the power mode (plugging or unplugging the power
cord) leads to instant panic, while with the drm-next-3.9 branch, switching
AC/battery modifies backlight value up and down without issues.

To reproduce:
# kldload drm2=20
# sysctl dev.drm.skip_ddb=3D1=20
# kldload i915kms=20
[plug / unplug the power cord  (the result is exactly the same)]=20

panic: IMPLEMENT ME=20
=E2=80=A6then the backtrace (attached image).

--=20
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