No brightness control on Acer laptop

[Nikolay Tychina]

I tried aceracpi project's dstd too for my Aspire 5520,
but that dsdts are not fixed. :-(

2009/5/24 Székvölgyi Péter <ghostp at mcss.hu>

> Székvölgyi Péter wrote:
>
>> I have a Acer Extensa 5620 laptop and i didn't change the brightness
>> with keys or sysctl value.
>> I loaded asus, ibm and other laptop acpi modul, but nothing change.
>> Anyone has an idea how
>> can i change the brightness fater the system booted? ( Without ACPI i
>> can change, the brightness. )
>>
>
> Hi everyone!
>
> A boot-ed with verbose mode, and if i want to change the brightness i saw
> on dmesg: ( brightness down with key ):
> acpi: bad write to port 0x080 (32), val 0x1d
> or ( brightness up with key )
> acpi: bad write to port 0x080 (32), val 0x1c
>
> I tested with other dsdt file from google acer acpi, nothing changed:
> http://aceracpi.googlecode.com/svn/trunk/dsdt/acer/extensa/
>
> I installed FreeBSD-Current to an usb key and booted. The error is the
> same with brightness control.
>
> Anyone has an idea wath wrong?
>
> Thanks ours help!
> Peter
>
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