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Tue, 09 Feb 2021 21:31:45 -0800 (PST) MIME-Version: 1.0 From: Kevin Oberman Date: Tue, 9 Feb 2021 21:31:30 -0800 Message-ID: Subject: Brightness cannot be set on Lenovo L15 ThinkPad To: "freebsd-questions@freebsd.org" X-Rspamd-Queue-Id: 4Db7fq0bjzz3DkG X-Spamd-Bar: --- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=m32wSCT8; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of kob6558@gmail.com designates 2607:f8b0:4864:20::233 as permitted sender) smtp.mailfrom=kob6558@gmail.com X-Spamd-Result: default: False [-3.70 / 15.00]; R_SPF_ALLOW(-0.20)[+ip6:2607:f8b0:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_ALL(0.00)[]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-1.00)[-0.999]; FORGED_SENDER(0.30)[rkoberman@gmail.com,kob6558@gmail.com]; MIME_TRACE(0.00)[0:+,1:+,2:~]; RBL_DBL_DONT_QUERY_IPS(0.00)[2607:f8b0:4864:20::233:from]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2607:f8b0::/32, country:US]; FROM_NEQ_ENVFROM(0.00)[rkoberman@gmail.com,kob6558@gmail.com]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[questions@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[2607:f8b0:4864:20::233:from:127.0.2.255]; RCVD_IN_DNSWL_NONE(0.00)[2607:f8b0:4864:20::233:from]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[questions] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.34 X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Feb 2021 05:31:48 -0000 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