https://bugzilla.kernel.org/show_bug.cgi?id=51051
Summary: Acer Aspire S7 Brightness changes but hotkeys do not
work
Product: ACPI
Version: 2.5
Kernel Version: 3.6.7-4
Platform: All
OS/Version: Linux
Tree: Fedora
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Acer Aspire S7-391
Fedora 17
Intel 4000HD Onboard Graphics
With no acpi options specified for the kernel two devices are shown under
/sys/class/backlight. They are intel_backlight and something along the line of
acpi_video. Adding acpi_osi=Linux acpi_backlight=vendor to the boot arguments
gets rid of the acpi entry under backlights and leave only the intel_backlight.
This allows tools such as gnome power manager to adjust the backlight
successfully. Adding the boot options has the side effect of disabling the
brightness hot keys completely. Using xev and showkey show no key presses being
registered. If the boot options are removed then the hot keys function but do
not actually change the backlight. Also I can sucessfully echo a brightness
value in to /sys/class/backlight/intel_backlight/brightness at any time with
any boot options and have it take effect.
Steps to reproduce:
1. Add acpi_osi=Linux acpi_backlight=vendor to kernel command line
2. See only intel_backlight under /sys/class/backlight
3. Try to use brightness keys and see they don't register
Actual results:
1. Function keys to change brightness do not actually register but brightness
can be changed through gnome power applets
Expected results:
1. Brightness function keys should register and brightness should be changed
with them
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