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SubjectRe: [PATCH] Added backlight driver for Acer Aspire 4736
On Tue, Mar 13, 2012 at 08:09:52AM -0400, Pradeep Subrahmanion wrote:
> Before taking this approach , I had a look at the WMI interface.But I found from acer-acpi site that , the 4730 series
> is using new WMI interface which needs to be reverse engineered.
> As far as acpi interface is concerned , by default it is not at all causing any change in brightness.
> When 'acpi_osi=Linux' was added to the boot grub config , the brightness control with hot key started to work .
> But it was not changing to correct values. Increasing brightness after maximum level gives blank screen.

That page was last updated in 2009. Have you tried the current acer-wmi
code? You'd probably need to pass backlight=vendor if there's a
non-working ACPI interface.

When you say the ACPI interface doesn't work, what do you mean? Have you
tried using the /sys/class/backlight interface directly?

--
Matthew Garrett | mjg59@srcf.ucam.org


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