Messages in this thread |  | | | Date | Sun, 8 Oct 2006 21:41:24 +0200 | | From | Pavel Machek <> | | Subject | /sys/.../power/state Re: [linux-usb-devel] error to be returned while suspended |
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Hi!
> > > The power management functions without > > > timeout are also exported. For other power control features like > > > cpu frequency considerable effort has been made to export them to > > > user space. > > > > Yes, and many of us use the much lighter weight kernel based control > > models by preference. Why waste hundreds of Kbytes of userspace for > > a daemon when a few hundred bytes of kernel code can implement a > > better and more reactive kernel policy for cpufreq? > > That's an important aspect. How about implementing autosuspend > first and keeping the sysfs-based suspension for now? If autosuspend
Current sysfs-based suspension allows people to do bad stuff to drivers, like confusing them, oopsing them, etc. It is so broken that it can not be fixed. (When I suspend my USB this way, I end up with dead USB. When I suspend my sound card, I get any soundcard users in unrecoverable D state.)
Now... you can prove me wrong, but that likely means auditing all the drivers with suspend() and/or resume() methods. I'm not prepared to do that work... are you? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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