Cheap UPS with USB «flicker» with FreeBSD but not with Windows

Fri Apr 17 12:59:13 UTC 2020

 Cheap Ippon UPS flickers with USB connection when master is FreeBSD CURRENT:

....
Apr 17 15:49:02 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2 (disconnected)
Apr 17 15:49:07 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2
Apr 17 15:49:21 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2 (disconnected)
Apr 17 15:49:26 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2
Apr 17 15:49:40 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2 (disconnected)
Apr 17 15:49:45 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2
Apr 17 15:49:59 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2 (disconnected)
Apr 17 15:50:04 gateway kernel: ugen2.2: <PPC Offline UPS> at usbus2
....

 It works stable when connected to Windows notebook. Yes, I understand, that it is different host hardware.
 Unfortunately, I can not check other OSes on hardware where it flickers, but maybe it is possible to set (or add) some quirk on our side?

-- 
// Lev Serebryakov

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