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Message-ID: <20120313124738.GB10822@srcf.ucam.org> Date: Tue, 13 Mar 2012 12:47:38 +0000 From: Matthew Garrett <mjg@...hat.com> To: Pradeep Subrahmanion <subrahmanion.pradeep@...il.com> Cc: rpurdie@...ys.net, FlorianSchandinat@....de, akpm@...ux-foundation.org, linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [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@...f.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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