It doesn’t seem to show up in the verbose log at all on initial boot. Here’s the log from unplugging it and plugging it back in, post-boot:
235750 Vanished MIDI INPUT : Electra Controller
235750 Vanished MIDI OUTPUT : Electra Controller
238971 Discovered MIDI INPUT : Electra Controller
238971 Discovered MIDI OUTPUT: Electra Controller
The corresponding kernel log is:
[ 251.420000] usb 1-1.4.4.3.4: USB disconnect, device number 24
[ 254.220000] usb 1-1.4.4.3.4: new full-speed USB device number 29 using ehci-platform
Reading back up through the kernel logs on that boot, I see the following log entries right after device 24 shows up for the first time that might or might not be relevant:
[ 19.440000] usb 1-1.4.4.3.4: new full-speed USB device number 24 using ehci-platform
[ 19.440000] hid_holtekff: Unknown symbol hid_unregister_driver (err 0)
[ 19.440000] hid_holtekff: Unknown symbol __hid_register_driver (err 0)
[ 19.440000] hid_holtekff: Unknown symbol hid_connect (err 0)
[ 19.440000] hid_holtekff: Unknown symbol hid_open_report (err 0)
[ 19.440000] soundcore: exports duplicate symbol register_sound_dsp (owned by kernel)
[ 19.460000] ath: EEPROM regdomain: 0x0
[ 19.460000] ath: EEPROM indicates default country code should be used
[ 19.460000] ath: doing EEPROM country->regdmn map search
[ 19.460000] ath: country maps to regdmn code: 0x3a
[ 19.460000] ath: Country alpha2 being used: US
[ 19.460000] ath: Regpair used: 0x3a
[ 19.470000] ieee80211 phy0: Selected rate control algorithm ‘minstrel_ht’
[ 19.480000] cfg80211: Calling CRDA for country: US
[ 19.480000] cfg80211: Regulatory domain changed to country: US
[ 19.480000] cfg80211: DFS Master region: FCC
[ 19.480000] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 19.480000] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
[ 19.480000] cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 1700 mBm), (N/A)
[ 19.480000] cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (N/A, 2300 mBm), (0 s)
[ 19.480000] cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 3000 mBm), (N/A)
[ 19.480000] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
[ 19.480000] ieee80211 phy0: Atheros AR9330 Rev:1 mem=0xb8100000, irq=2
[ 19.500000] hid_holtekff: Unknown symbol hid_unregister_driver (err 0)
[ 19.500000] hid_holtekff: Unknown symbol __hid_register_driver (err 0)
[ 19.500000] hid_holtekff: Unknown symbol hid_connect (err 0)
[ 19.500000] hid_holtekff: Unknown symbol hid_open_report (err 0)
[ 19.500000] soundcore: exports duplicate symbol register_sound_dsp (owned by kernel)
[ 19.500000] hid_holtekff: Unknown symbol hid_unregister_driver (err 0)
[ 19.500000] hid_holtekff: Unknown symbol __hid_register_driver (err 0)
[ 19.500000] hid_holtekff: Unknown symbol hid_connect (err 0)
[ 19.500000] hid_holtekff: Unknown symbol hid_open_report (err 0)
[ 19.500000] soundcore: exports duplicate symbol register_sound_dsp (owned by kernel)
(not the 802.11/ath stuff, obviously)
Right before I rebooted to get these logs, I plugged it and unplugged it and it showed up perfectly, with exactly the set of logs that you see. One thing that may or may not make a difference — I’m on firmware 1.5 beta2 (52191) on my Bome Box, which is a private build Florian sent me that re-enabled more than 16 USB midi devices after a regression in the last release build.
The device is on a powered hub — one of two chained Startech 60W industrial 10-port hubs. The behavior seems to be the same even if there’s only one hub and it’s the only thing plugged in. However, in testing that, I did discover that there seems to be some ordering issues. If I boot up with everything else other than the electra unplugged and then put everything else in, the electra shows up with all ports and everything else plays nicely. If I boot with everything plugged in, everything else except the electra shows up normally, but the electra only shows the single port, as above.
I do have another hub I can try it with if you think it’s worth it, but these have been rock solid otherwise, and the ordering stuff suggests that it’s not that.