https://bugzilla.kernel.org/show_bug.cgi?id=43741
Summary: /sys/class/backlight/ is empty with AMD (ATI) Radeon
HD 4350
Product: ACPI
Version: 2.5
Kernel Version: 3.2.0-26-generic
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=74171)
--> (https://bugzilla.kernel.org/attachment.cgi?id=74171)
/var/log/dmesg
Hi!
On an Ubuntu 12.04 PC with Linux 3.2.0-26-generic x86_64 and
AMD (ATI) Radeon HD 4350 VGA controller the kernel does not recognize
the ability of the VGA to change brightness of the connected monitor
(HP LA2405wg).
/sys/class/backlight/ is empty and tools for brightness control report
errors. I tried the following options in /etc/default/grub (and
updated grub configuration after the change):
GRUB_CMDLINE_LINUX="pcie_aspm=force acpi_osi=Linux acpi_backlight=vendor"
but to no avail.
-- rpr.
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