On 10/06/2013 12:00 PM, [email protected] wrote: > Message: 2 Date: Sun, 06 Oct 2013 11:17:13 -0700 From: Keith Packard > <[email protected]> To: Mark Kettenis <[email protected]> Cc: > [email protected], [email protected], > [email protected] Subject: Re: [PATCH] Close non-keyboard devices > on DPMS off Message-ID: <[email protected]> Content-Type: > text/plain; charset="utf-8" Mark Kettenis <[email protected]> > writes: >> > Is that really desirable? > It has a couple of benefits -- the first is that touch screens and touch > pads often get input while your laptop screen is closed; this prevents > that from waking up the X server. > > The second is that turning off input devices can allow the system to > shut down USB resources and save a bunch of power. I posted the patch so > that we could get measurements of the power savings. >> > For me, moving the mouse has always been the most natural way to wake >> > up the screen. > Yeah, that's the usual way I wake my machine up as well. However, if you > try this on an OS X machine, you'll find that only the keyboard will > wake the machine up. So, it's not a universal policy at least. > >> > And I can imagine that touching the screen is the most >> > natural way to do it on a device with a touchscreen. Such devices >> > might not even have keyboard. > It's hard to imagine a device without *any* keys, but it's certainly > possible. The trick would be to figure out how to detect this > automatically; my machine lists six "keyboard" devices: > > ? Power Button id=6 [slave > keyboard (3)] > ? Power Button id=8 [slave > keyboard (3)] > ? Sleep Button id=9 [slave > keyboard (3)] > ? FaceTime HD Camera (Built-in) id=11 [slave > keyboard (3)] > ? Apple Inc. Apple Internal Keyboard / Trackpad id=12 [slave > keyboard (3)] > ? Video Bus id=7 [slave > keyboard (3)] > > I think the interesting part here is the potential for power savings > while the screen is blanked; getting some idea of how much closing the > other devices is worth would be really helpful in figuring out when to > make this choice. > > -- [email protected] Keith, why do you want to fix something that isn't broken, by breaking it? You say it's hard to imagine a device without *any* keys, well such 'devices' are the ONLY kind of devices I ship running the X server. These are not battery operated machines so the advantage of saving power doesn't exist. What is wrong with waking up a touchscreen driven computer by touching the screen? There's nothing wrong with it!
--Gene Mosher
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