Hi Pali,
於 五，2011-12-09 於 22:36 +0800，Li Joey 提到：
>
>
> ---------- Forwarded message ----------
> From: Pali Rohár <[email protected]>
> Date: 2011/7/15
> Subject: Brightness on HP EliteBook 8460p
> To: [email protected]
>
>
> Hello,
>
> on my HP EliteBook 8460p is not possible to set display brightness
> when ACPI
> is enabled in kernel. Entries in sysfs is properly created without
> errors. But
> when I try write any value
> to /sys/class/backlight/acpi_video0/brightness
> nothing happened (and no error is in dmesg). When I press Fn key for
> chaining
> display brightness kernel send correct key event (tested with xev) but
> nothing
> happened too.
>
> When I disabled ACPI (acpi=off in kernel command line) all Fn keys are
> broken
> and not working (no events in xev). But brightness keys working (I
> think on HW
> level, because xev does not see it) - increase and decrease display
> brightness.
>
> So what can I do with my notebook? I think that there is error/bug in
> BIOS or
> ACPI because with disabled ACPI brightness working. But with disabled
> ACPI is
> notebook unuseable (no battery info, no Fn keys, no WIFI rfkill, ...).
> Can
> somebody help me with this problem?
>
> --
> Pali Rohár
> [email protected]
>
You can try to put kernel parameter:
acpi_osi="!Windows 2009"
to /boot/grub/menu.lst, then reboot look at maybe better.
And,
could you please kindly share DSDT and dmidecode to me?
Plesae login by root then:
% acpidump > acpidump.dat
% dmidecode > dmidecode.log
Thanks a lot!
Joey Lee
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