On Oct 6, 2013 1:26 PM, "Gene Mosher" <[email protected]> wrote: > > 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
You should always try to save power, even if you are using electricity instead of a battery. Its the right thing to do.
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