[Bug 253765] link_elf: symbol backlight_get_info_desc undefined during boot on Pinebook

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253765

            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 at FreeBSD.org
          Reporter: brett.mastbergen at gmail.com

Created attachment 222724
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=222724&action=edit
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.

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