https://bugzilla.kernel.org/show_bug.cgi?id=59671
Summary: Backlight keys don't work correctly out-the-box
Product: ACPI
Version: 2.5
Kernel Version: 3.9.5-1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: low
Priority: P1
Component: Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Hello. I have noticed for a long ago this bug, and I have "solved" it with
Archlinux forums help. I don't understand a lot of things of the Linux Kernel,
but I try to explain.
I have a Packard Bell EasyNote TS with nVidia Optimus. Out-the-box backlight
keys work correctly, but I can't set brightness with this nor xbacklight. If I
add to the kernel line "acpi_backlight=vendor", I can set brightness with
xbacklight, but backlight keys don't work. In that forum an user recommends me
add acpi_osi="!Windows 2006" acpi_osi="!Windows 2009" to the kernel line and it
solved my problem, but this user think is a bug (I think this too, in a too old
kernel version it works correctly with acpi_backlight=vendor line).
I attach an acpidump and show you the topic.
https://bbs.archlinux.org/viewtopic.php?id=164662
Sorry for my English :).
Regards.
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