[Bug 268492] Loading i915kms freezes the system after commit 50f61166f7b911a7807b3cb76d0f382a13fbafcd

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 20 Dec 2022 18:23:10 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268492

            Bug ID: 268492
           Summary: Loading i915kms freezes the system after commit
                    50f61166f7b911a7807b3cb76d0f382a13fbafcd
           Product: Base System
           Version: 13.1-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: philippe.michel7@free.fr

FreeBSD 13.1-STABLE on a Lenovo X250 (HD 5500 graphics).

After commit 50f61166f7b911a7807b3cb76d0f382a13fbafcd (Revert "LinuxKPI: Add
pci_power querying for drm-kmod"), the system freeze when i915kms is loaded
from rc.conf.

I didn't specifically check that the problem started immediately after this
commit, but reverting it at id 384a885111ada8b21f51542f48559c4cbce44f7b
(current head) fixes the issue for me.

I initially added a comment to
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=267421 but I now think that
the problem is different.

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