Re: [PATCH 1/3] backlight: Allow drivers to update the core, andgenerate events on changes

[Matthew Garrett]

On Tue, Jul 14, 2009 at 08:58:48AM +0800, ykzhao wrote:

> It will be better to send the event to user space only when the
> brightness is updated successfully.

That guarantees that we have to read back the brightness, which may be 
expensive on some hardware.

> It seems that the acpi video driver will send the ACPI event to user
> space when updating the brightness. 
> Is it necessary to send the udev-event again?

Yes. There's no reason to special-case the ACPI driver.

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
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