https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207086
Bug ID: 207086
Summary: LCD Brightness
Product: Base System
Version: 10.2-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
I'm unable to change LCD brightness on Lenovo Thinkpad Edge E145 using ☼+ and
☼- buttons. To be more specific, the brightness can be changed only until an
early system boot. It works in the loader menu, and right after kernel is
loaded, but stops working soon after that (perhaps when acpi0 is loaded:
“acpi0: <LENOVO TP-HS> on motherboard”).
I tested multiple FreeBSD version:
Affected FreeBSD versions:
- 11.0: FreeBSD-11.0-CURRENT-amd64-20160206-r295345-memstick.img
- 10.3: FreeBSD-10.3-PRERELEASE-amd64-20160127-r294913-memstick.img
- 10.2: 10.2-RELEASE-p12
- 10.1: FreeBSD-10.1-RELEASE-amd64-memstick.img
Working version:
- 9.3: FreeBSD-9.3-RELEASE-amd64-memstick.img (with “CPU0: local
ACPI error 0x80”)
As you can see, the problem occurred between 9.3 and 10.1.
I also tried different methods to change the brightness on 10.2:
acpi_call
=========
acpi_call -v -p '\VBRU'
Path: \VBRU
Number of arguments: 0
ioctl: Device not configured
# no effect
acpi_ibm
========
sysctl dev.acpi_ibm.0.lcd_brightness=7
# value changes, but it no effect on the brightness
acpi_video
==========
sysctl hw.acpi.video.lcd0.brightness=50
hw.acpi.video.lcd0.brightness: 50 -> #
# no effect
pressing Fn+☼+- buttons has no effect, but logs:
can't evaluate \134_SB_.PCI0.VGA_.LCD_._BQC - AE_NOT_FOUND
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