http://bugzilla.kernel.org/show_bug.cgi?id=13023
--- Comment #11 from ykzhao <yakui.z...@intel.com> 2009-04-08 02:28:26 ---
Hi, Piotr
From the acpidump we know that there is no _DOS object, which is required
for brightness control. In such case we have no generic ACPI backlight I/F.
At the same time there is no ACPI device for fujitsu driver, which means
that the backlight I/F registered by fujitsu driver is meaningless. Of course
the brightness can't be controlled by it.
When the system is booted with ACPI disabled, the brightness can be
controlled by hotkey. Maybe this is handled in SMI mode. But this is different
with ACPI.
From the above analysis it seems that this issue is related with BIOS. And
this had better be fixed by BIOS upgrading.
Thanks.
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