http://bugzilla.kernel.org/show_bug.cgi?id=13887
Summary: Broken backlight for Acer Aspire 4736z
Product: ACPI
Version: 2.5
Kernel Version: 2.6.30-4
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: vaibhav_19842...@yahoo.co.in
Regression: No
Created an attachment (id=22562)
--> (http://bugzilla.kernel.org/attachment.cgi?id=22562)
decompiled dsdt
while changing brightness value in sys or proc doesn't change brightness of the
laptop.
# cat /sys/class/backlight/acpi_video0/brightness
9
# cat /proc/acpi/video/OVGA/DD03/brightness
levels: 10 20 30 40 50 60 70 80 90 100
current: 100
I changed values to 1 and 10 corresponding in sys and proc, brightness doesn't
change.
OS : Debian/unstable
I am attaching decompiled dsdt for my laptop. I am not sure that it is an acpi
bug or the video driver bug. Fn+left/right keys change the value of brightness
in proc and sys.
# lspci -vxxx -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device 0260
Flags: bus master, fast devsel, latency 0, IRQ 29
Memory at 90000000 (64-bit, non-prefetchable) [size=4M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
I/O ports at 60f0 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 3
00: 86 80 42 2a 07 04 90 00 09 00 00 03 00 00 80 00
10: 04 00 00 90 00 00 00 00 0c 00 00 80 00 00 00 00
20: f1 60 00 00 00 00 00 00 00 00 00 00 25 10 60 02
30: 00 00 00 00 90 00 00 00 00 00 00 00 0b 01 00 00
40: 00 00 00 00 48 00 00 00 09 00 0a 61 b1 6d 51 1f
50: b9 e1 70 03 19 00 00 00 00 00 00 00 00 00 00 7c
60: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 05 d0 01 00 0c 30 e0 fe b1 41 00 00 00 00 00 00
a0: 00 00 00 00 09 00 06 20 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 40 01 00 00
d0: 01 00 23 00 00 00 00 00 00 00 00 00 34 00 00 00
e0: 00 00 00 00 00 00 00 00 00 80 00 1a 41 20 00 00
f0: 0b 19 34 07 cc 00 00 00 a0 0f 09 00 18 c0 a8 7b
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