Date: Wed, 29 Jan 2020 10:14:24 +0100 From: David Demelier <markand@malikania.fr> To: freebsd-questions@freebsd.org Subject: Changing hw.acpi.video.lcd0.brightness does nothing Message-ID: <c806591a-7714-6c42-dbae-de108739d9e6@malikania.fr>
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Hello, I have a thinkpad x1 carbon 4th gen. I wanted to give FreeBSD 12 a try and installed it in a USB hard drive. The module acpi_video(4) is loaded and nodes under hw.acpi.video are shown. However, changing values in hw.acpi.video.lcd0.brightness does nothing. It is correctly set but the screen brightness stays the same. Even tried values like 2, 98, etc. # sysctl hw.acpi.video.lcd0.brightness=2 # sysctl hw.acpi.video.lcd0.brightness=95 No change, it worked fine on my HP ProBook (which was more surprising since HP is not ACPI-compliant in many places). What's strange is the value hw.acpi.video.lcd0.active, it is 0 and trying to change to 1 is impossible. Any ideas? -- David
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