svn commit: r360025 - head/sys/dev/acpica
Oliver Pinter
oliver.pntr at gmail.com
Thu Apr 16 22:05:40 UTC 2020
On Thursday, April 16, 2020, Colin Percival <cperciva at freebsd.org> wrote:
> Author: cperciva
> Date: Thu Apr 16 21:56:52 2020
> New Revision: 360025
> URL: https://svnweb.freebsd.org/changeset/base/360025
>
> Log:
> Alert devd when acpi_video brightness changes
>
> On my Dell Latitude 7390 laptop, the brightness hotkeys
> (Fn+<up/down arrow>) send ACPI notifications which acpi_video
> handles by adjusting its brightness setting; but ACPI does not
> actually do anything with the backlight.
>
> Announcing brightness changes via devd makes it possible to close
> the loop by triggering the intel_backlight utility to perform the
> required backlight adjustment.
>
> Reviewed by: imp
> MFC after: 3 days
> Differential Revision: https://reviews.freebsd.org/D24424
>
> Modified:
> head/sys/dev/acpica/acpi_video.c
Please add this to release notes!
>
> Modified: head/sys/dev/acpica/acpi_video.c
> ============================================================
> ==================
> --- head/sys/dev/acpica/acpi_video.c Thu Apr 16 21:53:17 2020
> (r360024)
> +++ head/sys/dev/acpica/acpi_video.c Thu Apr 16 21:56:52 2020
> (r360025)
> @@ -1036,6 +1036,7 @@ vo_get_brightness(ACPI_HANDLE handle)
> static void
> vo_set_brightness(ACPI_HANDLE handle, int level)
> {
> + char notify_buf[16];
> ACPI_STATUS status;
>
> ACPI_SERIAL_ASSERT(video_output);
> @@ -1043,6 +1044,8 @@ vo_set_brightness(ACPI_HANDLE handle, int level)
> if (ACPI_FAILURE(status))
> printf("can't evaluate %s._BCM - %s\n",
> acpi_name(handle), AcpiFormatException(status));
> + snprintf(notify_buf, sizeof(notify_buf), "notify=%d", level);
> + devctl_notify("ACPI", "Video", "brightness", notify_buf);
> }
>
> static UINT32
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