[Bug 280553] acpi_ibm brightness adjust thinkpad x260 does not work

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280553

Emmanuel Vadot <manu@freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |manu@freebsd.org

--- Comment #1 from Emmanuel Vadot <manu@freebsd.org> ---
The problem for those keys and acpi_video/ibm is that as soon as drm is loaded
acpi_video cannot control the backlight anymore.
If you nc -U /var/run/devd.pipe you will likely see the events at each key
press (with notify=0x10 for UP and 0x11 for DOWN) which means that acpi_ibm is
working correctly but as said acpi_video cannot control the backlight
controller as soon as drm is loaded.
We probably need something in both acpi_video and drm so this works but I'm not
sure how to do that properly and no idea when I'll have time for this.

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