https://bugzilla.kernel.org/show_bug.cgi?id=71991
Bug ID: 71991
Summary: Brightness is always on maximum level, changing by
xbacklight or FN keys not work
Product: ACPI
Version: 2.5
Kernel Version: Brightness controll issue on laptops since 3.10.x
Kernel (can't adjust, always on max)
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Other
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Since 3.10.x kernels, brightess is always on maximum level (even on the newest
3.10.11-200 kernel). Changing level to max or low by Fn keys os xbacklight do
nothing, brightness is always on maximum. Bug was not on 3.9.x kernels, where
brightness control worked. Affect Fedora 18 too.
Laptop is Lenovo B570e. From Fedora 16 (it was the first Fedora on this laptop)
to 18 since 3.10.x, controlling brightness levels always worked.
Bug affects other laptops too. There is a topic about this on FedoraForums:
http://forum.fedoraforum.org/showthread.php?p=1665803
- The only solution I've found is adding this line to /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=Linux acpi_backlight=vendor
thinkpad-acpi.brightness_enable=0"
- Then execute as root: grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
- Then after restart Fn keys not work anymore, but brightness can be changed by
xbacklight.
Lspci:
$ lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family
DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series
Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family
USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family
High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 1 (rev b5)
00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 2 (rev b5)
00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI
Express Root Port 4 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family
USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC
Controller (rev 05)
00:1f.2 IDE interface: Intel Corporation 6 Series/C200 Series Chipset Family 4
port SATA IDE Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus
Controller (rev 05)
00:1f.5 IDE interface: Intel Corporation 6 Series/C200 Series Chipset Family 2
port SATA IDE Controller (rev 05)
02:00.0 Network controller: Qualcomm Atheros AR9285 Wireless Network Adapter
(PCI-Express) (rev 01)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
PCI Express Gigabit Ethernet Controller (rev 06)
Version-Release number of selected component (if applicable):
Kernels 3.10.x to newest 3.10.11-200
Steps to Reproduce:
1. Install Linux distro with 3.10.x on HP or Lenovo laptops
2. Upgrade system
3. Reboot system, brightness from start will be set to maximum and there is no
way to change it.
Actual results:
- Brightess is always on maximum
Expected results:
- Fixed bug, so brightes can be controlled again by Fn keys and xbacklight like
on 3.9.x kernels and olders kernels or Fedora versions
At start I thought it was only Fedora problem because it was my primary distro,
but on Ubuntu/Debian/Fedora with Linux 3.10.x or higher i have this same issue.
Before 3.10.x brightness can be controlled but on every start it was on maximum
level again after all and it had to be scaled once again. So it seems that this
is mainline Linux issue. Few months ago i posted above bug on Fedora bugzilla
but it seems that it's not problem of only one distro.
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