From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: <4e3ec2c35ebbcea203b84f774fab99fe@brasstown.quanstro.net> References: <80c35127014a05aaaa0ce39ebeddac96@hamnavoe.com> <4e3ec2c35ebbcea203b84f774fab99fe@brasstown.quanstro.net> Date: Wed, 23 Jan 2013 10:05:25 +0200 Message-ID: From: Harri Haataja To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary=bcaec54fb98a1aad9a04d3f028b3 Subject: Re: [9fans] 9pi + apple keyboard Topicbox-Message-UUID: 0d1033ec-ead8-11e9-9d60-3106f5b1d025 --bcaec54fb98a1aad9a04d3f028b3 Content-Type: text/plain; charset=ISO-8859-1 On 22 January 2013 19:06, erik quanstrom wrote: > > I've seen similar things with my apple keyboard on plan9 with > > the pi (as well as the failure you noted earlier). the pi is *very* > > picky about power. > USB power management is pretty smart in its way, but can do odd things. And what different devices do seems to vary. I've tested a wireless dongle that works in a hub (no extra power) connected to the pi, but won't even detect when plugged in directly. sort of sad when the keyboard uses more power than the computer. > > Coming from the embedded side of things, it seems natural to me that the electromechanical bits tend to eat most of the power budget. I have several things where a burning indicator LED would more than double the overall power consumption. On the other hand, good old raw LCD's basically take nothing. You can run a pocket calculator on a thumbprint's worth of old solar panel in room light. I always found that kind of amazing. A desktop keyboard shouldn't be that demanding, though. Saving power just probably hasn't been a priority in the design. -- I appear to be temporarily using gmail's horrible interface. I apologise for any failure in my part in trying to make it do the right thing with post formatting. --bcaec54fb98a1aad9a04d3f028b3 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable
On 2= 2 January 2013 19:06, erik quanstrom <quanstro@quanstro.net> wrote:
> I&= #39;ve seen similar things with my apple keyboard on plan9 with
> the pi (as well as the failure you noted earlier). the pi is *very* > picky about power.

USB power management is prett= y smart in its way, but can do odd things. And what different devices do se= ems to vary. I've tested a wireless dongle that works in a hub (no extr= a power) connected to the pi, but won't even detect when plugged in dir= ectly.

sort of sad when the keyboard uses more power than the computer.


Coming from the embedded side of thing= s, it seems natural to me that the electromechanical bits tend to eat most = of the power budget. I have several things where a burning indicator LED wo= uld more than double the overall power consumption. On the other hand, good= old raw LCD's basically take nothing. You can run a pocket calculator = on a thumbprint's worth of old solar panel in room light. I always foun= d that kind of amazing.

A desktop keyboard shouldn= 't be that demanding, though. Saving power just probably hasn't bee= n a priority in the design.

--
I appear to be temporarily using gmail's horrible interface. I apologis= e for any failure in my part in trying to make it do the right thing with p= ost formatting.
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