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@@ -676,7 +676,21 @@ after a size change. Upgrading to a new version of curses will fix it.
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Q: I have multiple USB stick devices but I can't get them all to work at once?
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A: Very few USB hubs deliver the promised power required to run as many devices
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-as they fit if all of them draw power from USB.
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+as they fit if all of them draw power from USB. Devices may use up to 2.5 watts
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+of power (or 4.5 watts for USB 3 devices), and mining USB sticks usually need it
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+all. You can estimate how much power your USB hub can provide by multiplying its
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+power supply's output amps by volts (so, if it says 12V 2.5A, you have 12*2.5=
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+30 watts).
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+
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+Q: I've confirmed my USB miners are powered sufficiently, but BFGMiner still
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+is having problems running more than a few at once?
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+A: Some USB hosts cannot deal with polling as often as miners may need for quick
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+delivery of shares. On Linux, you can request putting VCOM devices in "high
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+latency" mode (or rather, disabling the default "low latency" mode) using the
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+setserial command:
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+ setserial /dev/ttyUSB0 '^low_latency'
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+You can further tweak device latency by finding the latency_timer attribute in
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+sysfs.
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Q: I've plugged my devices into my USB hub but nothing shows up?
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A: RPis and Windows have incomplete or non-standard USB3 support so they may
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Luke Dashjr