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19878
November 26th, 2013 12:00
Increase USB time-out time to power Raspberry Pi?
I'm seeing more and more unloved 1703FPs and similar becoming available and they're great monitors for something like a Rapberry Pi, but they have one problem - the USB ports power down too fast. Newer Dell monitors power the USB ports, which can be used to power the Raspberry Pi, and retain power long enough for a cable back from the R-Pis USB port to the hub input to keep the USB hub live. But on the 1703s, the USB ports power down before the R-Pi has managed to power up the USB ports and convince the monitor to keep the hub powered up. So, any way to increase the timeout? Or is there a way to update the firmware? Is there anyone at Dell who might put some instructions together as a vanity project? I'm a software engineer who likes fiddling with hardware so if there is away to update the firmware to increase the timeout, or some service menu to do this perhaps, then I'd be happy to try things out if you contact me directly. Let's get these old monitors doing good work!
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papadeltasierra
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November 27th, 2013 00:00
Problem - if I try to power the Raspberry Pi from the 1703FPs monitor, it starts to boot and then the monitor decides "nobody using the USB hub, let's power it down". I've proved this by running a cable from another live PC to the hub-input port and then the hub stays up and powers the R-Pi quite happily.
Aside - on later Dell monitors, there is a sufficiently long "check USB orts are live" interval to "loop-back from the R-Pi to the monitor and this keeps the ports live - but the 1703FPs times out before the R-Pi gets a chance to bring it's USB ports up. So, is there any little bit of electronics I can cook up that if plugged into the Dell monitor will fool it into keeping the ports up long enough for the R-Pi to book? Or is there a way to increase the timeout period somehow?