Canonical System Image

Bug #1468020
Comment #16

Comment 16 for bug 1468020

Revision history for this message

Thomas Voß (thomas-voss) wrote on 2016-04-09: Re: [Bug 1468020] Re: Two GPS compatible apps conflict and loose GPS

#16

Let's clarify on the terminology here first: AGPS refers to assistance
technology that
enables a GPS chipset to query relevant information
(ephemeris/almanac) over a data link (mobile data/wifi)
that offers more bandwidth than the satellite down link (~1Hz). With
that, *if* you are travelling in
situations with little satellite visibility, AGPS will be of no help,
as the GPS chipset just has no beacons
from satellites to determine which ones are visible and subsequently
triangulate a position.

I think you are referring to the network-based positioning which
estimates positions based on visible wifis and the radio cell
the phone is currently connected to. For the scenario you are
mentioning: What kind of "dark zones" did you drive through?
Did you have wifi enabled?

On Sat, Apr 9, 2016 at 12:29 AM, Sergi Quiles Pérez <email address hidden> wrote:
> @thomas-voss I forgot to say in my comments that the those tests were
> made travelling inside a car. So the phone was sometimes trying to
> connect to AGPS to know the satellites positions when I was travelling
> in 'dark zones' for satellites.
>
> --
> You received this bug notification because you are a bug assignee.
> https://bugs.launchpad.net/bugs/1468020
>
> Title:
> Two GPS compatible apps conflict and loose GPS
>
> Status in Canonical System Image:
> Incomplete
> Status in location-service package in Ubuntu:
> Incomplete
>
> Bug description:
> Meizu MX4 with Ubuntu 15.04 r2
>
> 1. run OSMscout (for example)
> 2. drive/cycle a distance to confirm that GPS tracking is working fine
> 3. run the camera app (for example)
> 4. take a few photos (they'll be tagged with GPS info)
> 5. switch to OSMscout
> 6. drive/cycle and OSM will now not update from GPS
>
> Haven't tested this with other apps as yet, but it seems that one app
> will take control of the GPS and not hand it back. (For want of a
> better explanation.)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/canonical-devices-system-image/+bug/1468020/+subscriptions

On Sat, Apr 9, 2016 at 12:29 AM, Sergi Quiles Pérez <sergiqp@gmail.com> wrote:
> @thomas-voss I forgot to say in my comments that the those tests were
> made travelling inside a car. So the phone was sometimes trying to
> connect to AGPS to know the satellites positions when I was travelling
> in 'dark zones' for satellites.
>
> --
> You received this bug notification because you are a bug assignee.
> https://bugs.launchpad.net/bugs/1468020
>
> Title:
>   Two GPS compatible apps conflict and loose GPS
>
> Status in Canonical System Image:
>   Incomplete
> Status in location-service package in Ubuntu:
>   Incomplete
>
> Bug description:
>   Meizu MX4 with Ubuntu 15.04 r2
>
>   1. run OSMscout (for example)
>   2. drive/cycle a distance to confirm that GPS tracking is working fine
>   3. run the camera app (for example)
>   4. take a few photos (they'll be tagged with GPS info)
>   5. switch to OSMscout
>   6. drive/cycle and OSM will now not update from GPS
>
>   Haven't tested this with other apps as yet, but it seems that one app
>   will take control of the GPS and not hand it back. (For want of a
>   better explanation.)
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/canonical-devices-system-image/+bug/1468020/+subscriptions