https://bugzilla.kernel.org/show_bug.cgi?id=43310
Summary: no backlight control present for 3.4
Product: ACPI
Version: 2.5
Kernel Version: 3.4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: fafathe...@gmail.com
Regression: Yes
Created an attachment (id=73445)
--> (https://bugzilla.kernel.org/attachment.cgi?id=73445)
output of fwts on the latest linux 3.4 from the ubuntu quantal repositories.
beginning with 3.4-rc1 (I think), backlight control seems to be not in a
working state for my laptop.
the keyboard shortcuts have no effect (but work) and the backlight settings are
not displayed in gnome-control-center.
I compiled the latest 3.3.7 kernel from kernel.org and those things just work
fine.
but it neither works with the latest kernel from the ubuntu quantal repository,
nor with the latest kernel from kernel.ubuntu.com/~kernel-ppa/mainline, nor
with a manually compiled kernel from kernel.org mainline git.
Hardware details:
Sony VAIO VGN-FW21M, ATI Radeon HD 3400, Intel Core 2 Duo (P8600)
Setting acpi_backlight=vendor didn't change anything, still no entries in
/sys/class/backlight for 3.4.
I encountered some errors concering the DSDT, though.
I tried with both 3.4 ubuntu kernel and my vanilla 3.3.7 kernel, I got the same
results using fwts:
The reassembly of DSDT failed because of some "zero length" errors.
Something odd I found in my dmesg for 3.4 and 3.3.7 is the two lines
[ 0.687620] [Firmware Bug]: ACPI: No _BQC method, cannot determine initial
brightness
[ 24.098132] sony_laptop: brightness ignored, must be controlled by ACPI video
driver
for both kernels.
But then, I wonder why backlight control works with 3.3.7 and it doesn't with
3.4, when I get the same test results and corresponding dmesg outputs.
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