Comment 4 for bug 397617

(In reply to comment #3)
> On the driver side, we just need to hook up support for sysfs backlight in the
> KMS code.
> The i915 driver probably needs to get new code here to support i2c based
> backlight control on pre-opregion platforms.

do you mean that register a sysfs backlight class device in KMS code, and control the backlight via i2c when poking this I/F?

If yes, this may be a regression.
Because we are trying to provide a unique backlight sysfs I/F for users. i.e. hiding platform specific functions if the generic ACPI video interface is available.

(In reply to comment #2)
> Created an attachment (id=24394) [details]
> acpidump

From the acpidump attached, it seems that there is not ACPI video extension support on this platform.
can you tell me the model name of your computer please?