Date: Sun, 22 Mar 2026 09:56:59 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 293970] No backlight/brightness control on Thinkpad T490 Message-ID: <bug-293970-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293970 Bug ID: 293970 Summary: No backlight/brightness control on Thinkpad T490 Product: Base System Version: 15.0-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: skl246@tutamail.com Brightness control does not work on a ThinkPad T490 under FreeBSD/GhostBSD. There is no usable ACPI backlight interface exposed (no hw.acpi.video.lcd0.brightness), and the i915kms driver does not provide a working backlight control either. As a result, brightness cannot be adjusted at all. This issue is also present on FreeBSD 14.3. The same hardware works correctly on OpenBSD. -- You are receiving this mail because: You are the assignee for the bug.home | help
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