So what seems to be happening, is that the radio technology switch causes the modem to unregister from the current carrier, and attempt to re-register using the new tech preference ( eg. umts, lte, gsm, ... ). This will cause the ofono ConnectionManager 'Attached' property to return FALSE until the phone re-registers and re-attaches to GPRS.
NM detects the device change state from 'Activated' to 'Failed' ( more on this later ) and in turn schedules an auto-activation attempt of the connection ( context1 ). As the modem's not attached, the activation fails and the retry_count gets decremented, and it tries again repeatedly ( with no delay ), until the retry_count ( initialized to four ) drops to zero. At this point, NM disables the connection and adds a timeout of 300s in the future which will call a policy function that resets the connection's retry_count, and triggers a new autoconnect sequence. 300s / 60s/m == 5m, our mysterious delay. What we need is some mechanism for autoconnect to be blocked when the modem is not registered. It looks like nm-device-modem.c implements something like this in it's device_state_changed(). It checks a bunch of reason codes, but NM_DEVICE_STATE_REASON_MODEM_NO_CARRIER ( which is the error returned by stage1 if the modem isn't registered ) isn't checked. The code also would need a mechanism which would re-enable the autoconnect when the device becomes enabled again ( ie. when 'Attached' becomes TRUE again ). Also with regards to the device 'Activated' to 'Failed' transition, it's a bit odd that 'Disconnected' isn't used, as 'Failed' causes a retry attempt to be wasted ( see nm-policy.c ) because device_state_changed() treats a new state of FAILED as a connect failure and decrements the retry_count. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1418077 Title: After radio technology is changed, mobile-data takes ~5m to re-connect Status in the base for Ubuntu mobile products: In Progress Status in network-manager package in Ubuntu: In Progress Bug description: Steps to reproduce: 1. Confirm cellular data (disable wifi) 2. Change TechnologyPreference on online SIM 3. Confirm no cellular data 4. Wait ~10 minutes 5. Confirm cellular data What happens: Changing something on the modem causes cellular data to disappear for 10 minutes What should happen: It should behave as before, i.e. cellular data should come back immediately current build number: 97 device name: krillin channel: ubuntu-touch/devel-proposed alias: ubuntu-touch/vivid-proposed last update: 2015-02-02 12:48:25 version version: 97 version ubuntu: 20150202 version device: 20150128-5379bdb version custom: 20150202 To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1418077/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
