Thanks Dana. I'm including the corresponding upstream git commit id's
for the kernel team to reference. Thanks.
commit 38531e6fe51ad5c7dfe72e0e066b5f54bc1921cd
Author: Matthew Garrett <[EMAIL PROTECTED]>
Date: Wed Dec 26 02:03:26 2007 +0000
ACPI: video: Rationalise ACPI backlight implementation
The sysfs backlight class provides no mechanism for querying the
acceptable brightness for a backlight. The ACPI spec states that values
are only valid if they are reported as available by the firmware. Since
we can't provide that information to userspace, instead collapse the
range to the number of actual values that can be set.
http://bugzilla.kernel.org/show_bug.cgi?id=9277
Signed-off-by: Matthew Garrett <[EMAIL PROTECTED]>
Acked-by: Zhang Rui <[EMAIL PROTECTED]>
Signed-off-by: Len Brown <[EMAIL PROTECTED]>
commit 3fa2cdcc45a0176de15cac9dbf4ed2834ebf8932
Author: Matthew Garrett <[EMAIL PROTECTED]>
Date: Thu Feb 7 01:44:06 2008 +0000
ACPI: video: Ignore ACPI video devices that aren't present in hardware
Vendors often ship machines with a choice of integrated or discrete
graphics, and use the same DSDT for both. As a result, the ACPI video
module will locate devices that may not exist on this specific platform.
Attempt to determine whether the device exists or not, and abort the
device creation if it do not exist.
Signed-off-by: Matthew Garrett <[EMAIL PROTECTED]>
Signed-off-by: Len Brown <[EMAIL PROTECTED]>
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
Assignee: (unassigned) => Ubuntu Kernel Team (ubuntu-kernel-team)
Status: New => Triaged
--
LCD backlight turns off when between discrete levels, both from hotkeys and
from dim-on-idle.
https://bugs.launchpad.net/bugs/121833
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