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Date:	Wed, 19 Dec 2012 17:10:29 -0500 (EST)
From:	Tom St Denis <>
To:	Fabio Coatti <>
Subject: Re: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?

----- Original Message -----
> From: "Fabio Coatti" <>
> To:
> Sent: Wednesday, 19 December, 2012 5:01:30 PM
> Subject: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?
> Hi,
> I'm testing kernels 3.7.X vs 3.6.11 on an HP Folio 9470m machine,
> i915
> driver for a VGA compatible controller: Intel Corporation 3rd Gen
> Core
> processor Graphics Controller (rev 09) 8086:0166
> With 3.6.11, the brightness can be correctly set using fn+f9/10: kde
> shows the bar and brightness changes.
> With 3.7.1 kde shows the percentage bar and
> /sys/class/backlight/acpi_video0/brightness is updated, but the
> screen
> brightness does not changes.

I had a similar problem with my Dell laptop and i915/acpi...

Is there another acpi_video? device?  In my case two showed up in 3.7 whereas in 3.6 there was one.  In 3.7 it was controlling the wrong one apparently.

Tom St Denis
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