[Bug 195116] Display brightness control/resuming require acpi_video to be loaded after i915kms

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195116

--- Comment #2 from shadow53 at shadow53.com ---
New to bugzilla - didn't realize the attaching of files was its own comment.

The system described in the attachment has this same issue, where brightness
cannot be controlled if acpi_video is loaded on boot but can be controlled if
the module is unloaded and loaded again. The system is a laptop with an Intel
Skylake i5 processor and Optimus graphics, using only the Intel card.

I have not run into issues with black screens, though that may be because I'm
using the i915kms module from the drm-fbsd12.0-kmod package, loaded using
kld_list in rc.conf.

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