Date: Tue, 9 Feb 2021 21:31:30 -0800 From: Kevin Oberman <rkoberman@gmail.com> To: "freebsd-questions@freebsd.org" <questions@freebsd.org> Subject: Brightness cannot be set on Lenovo L15 ThinkPad Message-ID: <CAN6yY1u4FAQ6GNFQ46hWxrOiUThRJjLnBJrNUwXdRAbidksx8g@mail.gmail.com>
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I can only guess that this may be an ACPI issue. I recently (last week) replaced my decade old T520 with a new ThinkPad L15 with a 10th gen I5 CPU (Tiger Lake). I have everything working except the WiFi (which I knew would not work) and setting brightness on the display. I have loaded acpi_ibm and it returns '0' for brightness. I tried intel-backlight, which shows the brightness to be '0'. It does nothing, either. I thought that I read that drm-fbsd13-kmod had the ability to do the job, but I have no idea how to do anything with it. I do see sysctls for hw.i915kms.enable_dpcd_backlight and invert_brightness, but I still have no clue whether they are relevant. Any suggestions would be greatly appreciated! -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: rkoberman@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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