backlight device, suspend/resume...

Carsten Haitzler (The Rasterman) raster at
Tue Jul 8 16:54:49 CEST 2008

On Tue, 8 Jul 2008 11:37:39 -0300 Werner Almesberger <werner at>

> Andy Green wrote:
> > Kernel is always "limiting [userspace] ability to [do everything
> > itself]" and sometimes that's a sign what you want should be in the kernel.
> Or that you're doing too much in the kernel, e.g., the part that
> does what you'd rather not have done :-)
> Anyway, if the kernel restores the exact state it was in before
> suspend, which would seem like reasonable enough behaviour to me,
> user space could still come up with the backlight off if it just
> made sure to turn it off before requesting the suspend.
> This may mean that user space needs a suspend/resume coordinator
> where there is none yet, but you'd also need this if the kernel
> did nothing.

just what i'm doing... which is why i'm asking for the kernel to "please just
leave the device just as you found it on suspend.. i left it in that state for
a good reason!" :)

Carsten Haitzler (The Rasterman) <raster at>

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