3G modem causes system reset when no signal - Raspberry Pi Forums

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brief description:
when there no proper 3g signal 3g modem, system resets when usb_modeswitch. if system not reset, usb devices becomes non responsive , have reset hand.

long description:
can gather, there seems problem dwc_otg usb driver. seems patches have been applied driver, issues may still persist. rpi fine when there 3g signal or when remove sim card modem. but, if sim card inserted , there no 3g signal, rpi resets try switch modem or system becomes non responsive. problem appears both raspbian , archlinux. both distro's date latest packages on 19-06-2014. modem interrogated @ boot time, when there no signal, system goes constant reboot cycle until 3g signal becomes available.

not know if know error or if patch under way. slowing down usb speed down tot usb1.1 not option because need add hd webcam later on. if can shed light on problem appreciated.

hardware setup:
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raspberrypi model-b rev.2 (i have 2 boards, same problem)
4gb class10 sd card raspbian updated latest packages (19-06-2014)
4gb class10 sd card archlinux updated latest packages (19-06-2014)
ethernet cable connected
huawei e173 usb 3g modem connected directly top usb port
targus 4-port usb hub connected bottom usb port
trendnet tew-648ubm wifi adapter (rtl8188cus chipset) connected usb hub (not connected network)
dell usb keyboard connected usb hub
raspicam connected
hdmi monitor.
ds3231 realtime clock on i2c-1
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note on power supply:
rpi powered 25w, 5v power supply connected directly pin2 (+5v) , pin6 (gnd) on pin header.
have bridged wire directly pin2 (the +5v pin) +5v pins of usb socket. placed 330uf capacitor between +5v pins , ground @ bottom of usb socket make sure not power related. rpi , usb port therefore has stiff 5v power supply. therefore regard problem software related.

note on 3g modem:
3g modem works fine on pc running ubuntu window 7. there no 3g signal, not connect , system runs normally.

reboots usb devices common problem on pi , despite best efforts stabilise +5v line believe it's wasn't enough.
may better off using powered usb hub or provide 3g dongle it's own regulated 5v supply while removing usb +5v line prevent feeding pi.

richard s.


raspberrypi



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