https://bugzilla.kernel.org/show_bug.cgi?id=65601
Bug ID: 65601
Summary: Linux dell-xps 3.13.0-031300rc1-generic #201311221535
SMP Fri Nov 22 20:36:51 UTC 2013 x86_64 x86_64 x86_64
GNU/Linux
Product: ACPI
Version: 2.5
Kernel Version: 3.13.0-031300rc1-generic
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: acpi_power-vi...@kernel-bugs.osdl.org
Reporter: tomas.iva...@gmail.com
Regression: No
On Lenovo T440s with kernel 3.13.0-031300rc1-generic are only 5 modes of
brightness. First mode shutdown back light completely off, so there are only 4
modes of brightness.
4 modes are too bright or too low, there is nothing between. It hurts my eyes.
as a parameter using this:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
root@dell-xps:/sys/class/backlight/intel_backlight/device/intel_backlight/subsystem/intel_backlight#
ll
total 0
drwxr-xr-x 3 root root 0 Nov 24 12:05 ./
drwxr-xr-x 5 root root 0 Nov 24 12:05 ../
-r--r--r-- 1 root root 4096 Nov 24 12:05 actual_brightness
-rw-r--r-- 1 root root 4096 Nov 24 12:14 bl_power
-rw-r--r-- 1 root root 4096 Nov 24 12:13 brightness
lrwxrwxrwx 1 root root 0 Nov 24 12:14 device -> ../../card0-eDP-1/
-r--r--r-- 1 root root 4096 Nov 24 12:05 max_brightness
drwxr-xr-x 2 root root 0 Nov 24 12:14 power/
lrwxrwxrwx 1 root root 0 Nov 24 12:05 subsystem ->
../../../../../../../class/backlight/
-r--r--r-- 1 root root 4096 Nov 24 12:14 type
-rw-r--r-- 1 root root 4096 Nov 24 12:05 uevent
root@dell-xps:/sys/class/backlight/intel_backlight/device/intel_backlight/subsystem/intel_backlight#
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