[Bug 263032] backlight(8) can't query the device
Date: Mon, 04 Apr 2022 11:17:16 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263032 Bug ID: 263032 Summary: backlight(8) can't query the device Product: Base System Version: 13.0-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: bugs@FreeBSD.org Reporter: firstname.lastname@example.org Created attachment 232927 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232927&action=edit <pciconf/kldstat/sysctl/dmesg> details On a FreeBSD 13.0-RELEASE-p8 installation, backlight(8) does not work despite proper initialisation of the backlight device. Hardware affected: vendor = 'Advanced Micro Devices, Inc. [AMD/ATI]' device = 'RV730/M96 [Mobility Radeon HD 4650/5165]' Available backlight device: crw-rw---- 1 root video 0x1f3 4 Apr. 10:22 backlight0 lrwxr-xr-x 1 root wheel 23 4 Apr. 10:22 radeon_bl00@ -> ../backlight/backlight0 Use of backlight(8) as non-root user (video group): backlight: Cannot query the backlight device Use of backlight(8) as root: backlight: Cannot update the backlight device (subsequent uses by a non-root also report the failure to update, not query, the backlight device) Workaround: loading 'acpi_video' module and using sysctl(8) to manipulate 'hw.acpi.video.lcd0.brightness'. Two other laptops with Intel chips do not have this problem. -- You are receiving this mail because: You are the assignee for the bug.