I've got a Gigabyte TX3 motherboard with 2 built-in USB ports. I ran Windows
on this previously with a USB scanner (HP 3300C). I later turned it into a
Linux router.
I've burned through 3 APC BK500 UPSs and I've tracked the problem down to
the USB connector.
Into the first UPS I plugged a bunch of equipment into (way too much) and the
USB connector and smoke started pouring out of the back. I unplugged everything
and APC kindly sent me a new unit. I then plugged in just the PC which
has a 250W power supply and the USB. It again started to burn right away.
Both times the UPS was on a rack so it was difficult to see exactly what was
going on, but the acrid smoke was enough to tell me something was amiss.
The APC test folks had looked at the first UPS I had returned and they found
a bunch of burned components but they coudln't tell why it failed. I haven't
returned the 2nd unit yet.
I just got the 3rd unit yesterday and charged the battery. This time I
decided to to a little detective work. First I plugged it into the outlet it
would be powered on (it was charged elsewhere) and everything was a-ok. I then
grabbed the USB cable from the new UPS and plugged it into the PC and
the UPS. I had already loaded the USB and HID drivers into linux
(kernel 2.2.18 with the USB patches). The UPS immediately started to smoke,
and this time it was obviously smoking from the USB/data connector.
I'll call APC on Monday to see what's going on, but I can't believe that
USB has enough juice to cause the thing to fry, I'm wondering if you guys
have any ideas.
thanks
rob
% lspci -vv
00:07.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Step
ping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort
- <MAbort- >SERR- <PERR-
Latency: 32 set
Interrupt: pin D routed to IRQ 11
Region 4: I/O ports at 6400
% modprobe usb-uhci
usb-uhci.c: $Revision: 1.237 $ time 23:24:37 Dec 23 2000
usb-uhci.c: High bandwidth mode enabled
usb-uhci.c: USB UHCI at I/O 0x6400, IRQ 11
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 1
usb.c: USB new device connect, assigned device number 1
usb.c: kmalloc IF c5fa3840, numif 1
usb.c: new device strings: Mfr=0, Product=2, SerialNumber=1
usb.c: USB device number 1 default language ID 0x0
Product: USB UHCI Root Hub
SerialNumber: 6400
hub.c: USB hub found
hub.c: 2 ports detected
hub.c: ganged power switching
hub.c: standalone hub
hub.c: global over-current protection
hub.c: power on to power good time: 2ms
hub.c: hub controller current requirement: 0mA
hub.c: port 1 is removable
hub.c: port 2 is removable
hub.c: local power source is good
hub.c: no over-current condition exists
hub.c: enabling power on all ports
usb.c: hub driver claimed interface c5fa3840
usb.c: kusbd: /sbin/hotplug add 1
usb.c: kusbd policy returned 0x0
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