ASUS U46E laptop brightness

[Henry Hu]

On Wed, Oct 30, 2013 at 11:12 AM, Sergiy Mikhailushko <ooomka at yandex.ru>wrote:

>
> Hi all
> Could you please help me with a little annoying problem concerning
> laptop backlight?
> I've got ASUS U46E laptop with Intel GMA graphics running FreeBSD
> 9-STABLE amd64. The problem is that backlight is always set to maximum
> value. Pressing Fn+F5 (brightness down) has no effect, just yielding the
> following to /var/log/messages:
>
> ACPI Error: Result stack is empty! State=0xfffffe00017fa800
> (20110527/dswstate-113)
> ACPI Exception: AE_AML_NO_RETURN_VALUE, Missing or null operand
> (20110527/dsutils-695)
> ACPI Exception: AE_AML_NO_RETURN_VALUE, While creating Arg 0
> (20110527/dsutils-821)
> ACPI Error: Method parse/execution failed [\_SB_.PCI0.GFX0.GCBL] (Node
> 0xfffffe000181f600), AE_AML_NO_RETURN_VALUE (20110527/psparse-560)
>
> This happens both in console and X Window mode
>
> What I've tried:
>
> 1) Flashed the latest BIOS version from ASUS website (ver301)
>
> 2) Upgraded OS to the latest STABLE version (last upgrade Oct 28 2013)
>
> 3) Loading acpi_asus module:
>       # kldload acpi_asus
>       # sysctl -a | grep asus
>       #
>
> 4) Loading acpi_video module:
>      # sysctl hw.acpi.video.lcd0.active=1
>       hw.acpi.video.lcd0.active: 0 -> 0
>       # sysctl hw.acpi.video.lcd0.fullpower=**60
>       hw.acpi.video.lcd0.fullpower: 100 -> 60
>       # sysctl hw.acpi.video.lcd0.economy=60
>       hw.acpi.video.lcd0.economy: 77 -> 60
>       # sysctl hw.acpi.video.lcd0.brightness=**60
>       hw.acpi.video.lcd0.brightness: 60 -> 60
> Values are changed but brightness doesn't
>
> 5) Using acpi_call utility (not sure what value should be changed, tried
> acpi_call -p '\_SB_.PCI0.GFX0.GCBL' and acpi_call -p
> '\_SB_.PCI0.LPCB.EC0_._Q0E' -- both resulting in Unknown object type '0')
>
>

I'm using ASUS UX51VZ and I can use this to adjust the brightness:

acpi_call -p "\_SB.ATKD.SPLV" -i $2
acpi_call -p "\ISMI" -i 154

I found these statements in acpidump, so you may find similar statements.


> 6) Writing to freebsd-questions and freebsd-acpi mailing lists -- no
> replies so far
>
> # uname -a
> FreeBSD toysrv 9.2-STABLE FreeBSD 9.2-STABLE #0 r257265: Mon Oct 28
> 23:05:31 EET 2013     oomka at toysrv:/usr/obj/usr/src/**sys/TOYSRV  amd64
>
> # acpidump -dt > u46e.asl (http://tny.cz/452a2978)
>
> I used to run i386 FreeBSD on this laptop -- the brightness control was
> okay on it. There were often kernel panics on that architecture so I've
> switched to amd64. Panics disappeared and the things work fine so far,
> except the screen brightness.
> I know that my problem isn't critical when I'm working on daylight or
> with external LCD display, but when I have to work at the laptop at
> night -- this spotlight really drives me crazy. Thank you in advance for
> your help.
>
>
>
>
>
>
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>



-- 
Cheers,
Henry