於 三，2011-12-21 於 10:16 +0800，joeyli 提到：
> 於 二，2011-12-20 於 14:20 +0100，Pali Rohár 提到：
> > On Tuesday 20 December 2011 16:13:39 joeyli wrote:
> > > > > >
> > > > > > adding any acpi_osi values did not changed anything (also tried
> > > > > > other osi strings from decompiled DSDT table). Brightness
> > > > > > problem is in both BIOS and UEFI boot mode.
> > > > > >
> > > > > > I attached acpidump and dmidecode output from bios and uefi mode
> > > > > > too.
> > > > >
> > > > > Did you find way how to control display brightness?
> > > >
> > > > I am really sorry for I am sticking on another tough issue.
> > > > I will look at your DSDT tomorrow.
> > > >
> > > >
> > > > Thanks
> > > > Joey Lee
> > >
> > > I just look at the DSDT of HP EliteBook, this machine check _OS name
> > > string, it's essentially obsolete.
> > >
> > > Please add the following kernel parameter to /boot/grub/menu.lst:
> > > acpi_os_name="Windows 2009"
> > >
> > > Let's by-pass the _OS name check first, hope it fix this issue.
> > >
> > >
> > > Thanks
> > > Joey Lee
> >
> > Hello,
> >
> > I tried to add one of these acpi_os_name into grub kernel command line:
> >
> > acpi_os_name="Windows 2009"
> > acpi_os_name="Windows 2006"
> > acpi_os_name="Windows 2001"
> > acpi_os_name="Windows 2001 SP1"
> > acpi_os_name="Windows 2001 SP2"
> >
> > but brightness control (via /sys/class/backlight/acpi_video0/brightness) did
> > not worked.
> >
> > --
> > Pali Rohár
> > pali.rohar@xxxxxxxxx
>
> In DSDT, check the following 3 OS name strings, just need feed a string
> not in list could be by-pass _OS check:
>
> Name (OSID, Package (0x03)
> {
> "Microsoft Windows",
> "Microsoft WindowsME: Millennium Edition",
> "Microsoft Windows NT" /* match with Linux kernel's _OS name default define */
> })
>
> Unfortunately, just by-pass _OS check cann't fix your problem. I need
> spend time to dig more detail in your DSDT.
> Could you please attached your whole dmesg log that cover system boot
> and press brightness control key a couple of times?
>
>
> Thanks a lot!
> Joey Lee
Sorry! forgot say! could you please also enable the acpi debug messages
in kernel parameter?
Just need add the following kernel parameter to /boot/grub/menu.lst:
acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF
Please attached dmesg and messages log.
Thanks a lot!
Joey Lee
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