Mailinglist Archive: opensuse-kernel (110 mails)

[Greg KH <gregkh@xxxxxxx>]

On Thu, Oct 20, 2011 at 02:59:05PM +0200, Guido Berhoerster wrote:
> Hi,
> can anyone give me a rough estimation of the level of sysfs
> support for setting backlight brightness on common hardware
> compared to xrandr?

They are two totally different things.

> Basically, xfce4-power-manager has a bug in the xrandr backend
> making it crash on resume
> (https://bugzilla.novell.com/show_bug.cgi?id=707127,
> https://bugzilla.xfce.org/show_bug.cgi?id=7851) and since
> upstream is unresponsive I'm wondering what the cost/benefit of
> temporarily disabling the xrandr backend would be, ie. whether
> disabling the xrandr backend and relying exclusively on the sysfs
> backend would break brightness manipulation for a large number
> of users.

xrandr should be using the sysfs interface the kernel exposes, if it is
present, otherwise, it might try to use some other interface, but it
should always be trying to use the sysfs one if it is there.

greg k-h
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