Hi, On Saturday 09 May 2009, Alan Stern wrote: [...] > > Of course I can enable autosuspend manually: > > > But this should be done every single time after device plug-in. Currently I use > > udev for this task, but it looks like an ugly hack. Is there any better way to > > handle this? > > I don't know. In theory programs like hal should take care of this for > you, but I'm not aware of how much progress has been made in this > direction. Well, currently I'm rather happy with udev and whitelist. > > IMO if kernel is configured with USB power saving enabled, it > > *should* be enabled by default. Is there any reason to avoid this? > > Yes indeed. A large percentage -- hard to estimate, but more than > large enough to cause widespread problems -- of USB devices can't > handle being suspended. They just die. > > If the kernel automatically suspended every USB device when it wasn't > in use, there would be loud and voluminous complaints. I know, because > the kernel used to work that way -- and there were! That was back > around 2.6.22 or earlier; see > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7d2c592609a7da950b458403f1936d382f38ff9c Ok, thanks for explanation. Previously I thought it will be good idea to use a blacklist, now I see why it isn't ;). -- Best regards, Andrew
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