Public bug reported:
For all ASUS machines, it will only notify the userspace app by udev event
while the brightness value is changed, instead of keyevent.
The procedure in the asus-wmi kernel module is as described below
1. receive the keyevent from WMI
2. if the brightness event is not handled by ACPI, then update the brightness
value through WMI
3. call backlight_force_update(), it will
1. send a change notification on the actual_brightness file (userspace can
monitor it using inotify or related), and
2. send a uevent which can be catched by udev or others (with SOURCE
being an env variable containing the source of this change)
The problem is that it won't report keyevent, so g-s-d won't show the
brightness OSD. But it actually reports the event, uevent.
It won't harm to monitor the uevent and read the brightness value from
actual_brightness and shows the OSD, even if there is already a keyevent
reported.
Please consider to add this feature, thanks.
The brightness uevent looks like this
==
KERNEL[16407.000334] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[16407.000555] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [16407.000605] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[16407.000730] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [16407.000997] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [16407.001164] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[16407.002040] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [16407.002212] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
==
** Affects: gnome-settings-daemon (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: GNOME Bug Tracker #672380
https://bugzilla.gnome.org/show_bug.cgi?id=672380
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https://bugs.launchpad.net/bugs/959106
Title:
brightness changing problem in ASUS machines
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