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Date:      Mon, 22 Feb 2021 15:37:26 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 253765] link_elf: symbol backlight_get_info_desc undefined during boot on Pinebook
Message-ID:  <bug-253765-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D253765

            Bug ID: 253765
           Summary: link_elf: symbol backlight_get_info_desc undefined
                    during boot on Pinebook
           Product: Base System
           Version: 13.0-STABLE
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: brett.mastbergen@gmail.com

Created attachment 222724
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D222724&action=
=3Dedit
FreeBSD 13.0-BETA1 Pinebook dmesg

While booting FreeBSD 13.0-BETA1 on the Pine64 Pinebook the pwm_backlight
module is unable to find the backlight interface symbols, resulting in the
following dmesg output:

link_elf: symbol backlight_get_info_desc undefined

This prevents the backlight dev node from being created and as such, the
backlight utility cannot be used to control the display backlight.

The attached patch adds MODULE_DEPEND on backlight to pwm_backlight.  With =
this
change, the backlight device is correctly created and the backlight utility=
 can
successfully control the display backlight on the Pinebook.

--=20
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