This version is no longer supported. If this is still reproducible on a
newer/supported version, please reopen.
** Changed in: linux (Ubuntu)
Status: Confirmed => Won't Fix
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Tested with kernel 3.9.0-rc1 (http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.9-rc1-raring/), and boot parameters "acpi_osi=Linux
acpi_backlight=vendor".
System settings brightness panel does affect brightness, with too issues:
1. lowest brightness is not very low, looks like 20-30% instead of
Tested with http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.9-rc1-raring/
No change in reported behavior.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.8 kernel[0] (Not a kernel in the daily directory) and install both
the linux-image and linux-image-extra .deb packages.
If this bug is fixed in the ma
The problem is cause by gsd-backlight-helper - it query udev for
"backlight" devices, and then pick the first device with type
"firmware", "platform", or "raw".
When running on this mahcine (Asus X101CH), it find these devices:
1. firmware: /sys/devices/pci:00/:00:02.0/backlight/acpi_vide
Fixed if adding this to the boot parameters:
acpi_osi=Linux acpi_backlight=vendor
But in this mode the system freeze when you try to change the brightness
using the hardware keys (Fn + F5, Fn + F6).
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** Description changed:
The brightness system setting page does not effect the display
brigthness and does not dispaly the currnet brightness.
To reproduce:
1. Set brightness to 50 using (as root):
echo 50 > /sys/class/backlight/psb-bl/brightness
2. Open System Settings > Brig
