[Bug 33362] No ACPI device

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=33362

--- Comment #1 from Alex Deucher <agd5f at yahoo.com> 2011-01-22 09:54:50 PST ---
(In reply to comment #0)
> Sorry for my english...
> I installed Ubuntu 10.10 x64 on a MacBookPro 2,2 with Radeon Mobile X1600.
> I try to change brightness of my screen but i discover that
> /sys/class/blacklight is empty and there isnt /sys/class/lcd.

That's an issue with acpi on your system.

> I read the dmesg and i found this 2 lines:
> 
> failed to evaluate ATIF got AE_BAD_PARAMETER
> radeon 0000:01:00.0: Error during ACPI methods call

You can ignore this.  It's an acpi method used by the driver that's only
available on some systems.

> 
> is a bug of the driver? i look for it in internet but i dont find anything...

The driver doesn't control the backlight natively.  The backlight is handled
via acpi methods as the way the backlight is wired up varies from oem to oem.

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