From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Forconi <forconi@wavecomm.it>
Cc: linux-kernel@vger.kernel.org
Subject: Re: KMS Framebuffer on Intel N2600 (GMA3600)
Date: Wed, 14 Nov 2012 17:17:55 +0000 [thread overview]
Message-ID: <20121114171755.27b8423b@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <624976355.1341772.1352911727159.JavaMail.root@zmail.sgconsulting.it>
> This backlight problem appears only when I run linux with KMS framebuffer,
> when I run linux without KMS framebuffer, the backlight is always on.
>
> Yes, I have ACPI enabled and ACPI backlight enabled, but running:
> echo 100 > /sys/class/backlight/psb-bl/brightness
psb-bl/backlight willbe the backlight of the graphics not the ACPI
driver. You may need to enable that and also hack the acpi_video code to
add it anyway on that device.
> But, in the end, this means that the driver si correctly loaded and the
> framebuffer is running but the panel backlight is off?
> In other words, I can't see anything only because the backlight is off?
I think so.
> I don't know which could be the maximum value, there are any standard values
> for backlight settings? I could try setting some values and see what happens...
Unfortunately not - and I have no idea what overdriving it would do to
the hardware.
Alan
next prev parent reply other threads:[~2012-11-14 17:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1877610299.1316440.1352881150817.JavaMail.root@zmail.sgconsulting.it>
2012-11-14 8:40 ` Forconi
2012-11-14 11:52 ` Alan Cox
2012-11-14 16:48 ` Forconi
2012-11-14 17:17 ` Alan Cox [this message]
2012-11-15 9:09 ` Forconi
2012-11-15 12:57 ` Alan Cox
2012-11-16 14:50 ` Forconi
2012-11-16 15:44 ` Alan Cox
2012-11-16 16:32 ` Forconi
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