GPS not working - could not open gps serial device /dev/ttyUSB3: Permission denied

[Guest beegee1962]

I have a Viewpad 10s with internal 3G/GPS modem. I am running CorvusKernel 0.2 (non AOSP version) and my own ROM Ganbarou V 1.0. But the same problem happens with other ROMs.

The GPS never finds a fix, so I started investigations, special because other users of my ROM report that the GPS is working for them.

I started logcat immediately after booting of the tablet starts and get the following: (Filtered to show only GPS related messages)

08:20:23.671 Debug gps_hw 1083 gps_get_hardware_interface: called

08:20:24.218 Debug gps_hw 1083 hw_gps_init: called

08:20:24.218 Debug gps_hw 1083 GPS-V100R001B001D01SP00C03

08:20:24.218 Error gps_hw 1083 could not open gps serial device /dev/ttyUSB3: Permission denied

08:20:24.218 Debug gps_hw 1083 hw_gps_init fail !

08:20:24.218 Warning GpsLocationProvider 1083 Failed to enable location provider

08:20:28.156 Debug gps_hw 1083 hw_gps_init: called

08:20:28.156 Debug gps_hw 1083 GPS-V100R001B001D01SP00C03

08:20:28.156 Error gps_hw 1083 could not open gps serial device /dev/ttyUSB3: Permission denied

08:20:28.156 Debug gps_hw 1083 hw_gps_init fail !

08:20:28.265 Warning GpsLocationProvider 1083 Failed to enable location provider

08:20:44.359 Debug GpsLocationProvider 1083 NTP server returned: 1308180045574 (Thu Jun 16 08:20:45 GMT+09:00 2011) reference: 81720 certainty: 160 system time offset: 8114

08:20:44.359 Debug gps_hw 1083 hw_gps_inject_time: called

08:20:44.359 Debug gps_hw 1083 hw_gps_get_extension: called

08:20:44.359 Debug gps_hw 1083 GPS_XTRA_INTERFACE

Anybody has an idea why the access to the GPS communication port is denied?

[Guest trevor432990]

Hiya ... not familiar with internal GPS systems but maybe you have the same timing problems as external devices so why not try downloading the GPS On/off widget I have mentioned previously in my GPS threads and see if that makes any difference. Worth a try anyway ;)

[Guest beegee1962]

Hiya ... not familiar with internal GPS systems but maybe you have the same timing problems as external devices so why not try downloading the GPS On/off widget I have mentioned previously in my GPS threads and see if that makes any difference. Worth a try anyway ;)

Tried it already. Not working.

The problem occurs long before Android is showing the lock screen. Must be somewhere deep in the system or kernel. Maybe my 3G/GPS modem is slower during initializing than others. I know another user on a German forum who has the same problem.