My Kb & mouse [kb&m] work just fine when plugged directly into RPi, but neither are “seen” when plugged into your 81x4 hub. [Note: neither device is mentioned in the Verified Peripherals list [http://elinux.org/RPi_VerifiedPeriphe… ].
H/W: SIIG Mini Multimedia Kb 02-1230B (wired); MS Wheel Mouse Optical USB1.1; 16GB Sandisc U-1; 1Gb LAN; HDMI output. The hub used a micro-USB2 cable to power the RPi, and used a classic USB2 “A/B” up-link cable with what appeared to be a ferrite choke.
Otherwise, the hub seems Fine: RPi recognized a USB3 Seagate Backup Plus drive through the hub – I had to plug the mouse into the hub to free up the USB2 port for the hub, so the mouse disappeared in this connection; and the hub worked Beautifully when I attached it to my Win8 desktop computer’s USB3 port as I created the RPi SD drive and ran throughput tests.
Likewise, the kb&m work just fine off a hub when I replace your hub with an APC USB2HUB-7P-1V, ceteris paribus.
I’ve had both your hub and the RPi only one week: I haven’t learned enough of RPi-LINUX to diagnose this problem further. Note: I had no luck with a wireless kb&m connection to the RPi – which was just a brief test and may have some resolution – which left me with only my one set of -wired- kb&m… and the above problem. If I can unearth or borrow another kb&m, I’ll see if I have the same result.
Worst case: I’ve a great USB3 hub for my other computers. I’m quite impressed with the email exchanges I’ve had with Jeromy, the insightful posts I’ve read here, and the enthusiastic posts regarding Plugable I’ve read elsewhere.