Theory about why GPS performs poorly - Page 7 - maemo.org

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Page 7 of 14

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	superbondbond	2008-02-05 , 18:31
	Posts: 103 \| Thanked: 31 times \| Joined on Sep 2006 @ US	#61

Originally Posted by tabno

How did you flash?

Which version do you get with "apt-cache show osso-esd"?
I get 0.52-14

I downloaded the update image from tablets-dev.nokia.com and used the Linux flasher tool.

"apt-cache show osso-esd" returns version 0.52-8

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jussik	2008-02-05 , 18:55
Posts: 139 \| Thanked: 24 times \| Joined on Sep 2005	#62

superbondbond, Christian K:
If you do IRC, please come to #maemo on freenode (the latency on these web forums is killing me). my nick is jku.

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tabno	2008-02-05 , 19:02
Posts: 17 \| Thanked: 0 times \| Joined on Nov 2007	#63

Originally Posted by superbondbond

I downloaded the update image from tablets-dev.nokia.com and used the Linux flasher tool.

"apt-cache show osso-esd" returns version 0.52-8

And which version do you get with "/usr/sbin/gpsd -V"?

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mikkov	2008-02-05 , 19:04
Posts: 1,208 \| Thanked: 1,028 times \| Joined on Oct 2007	#64

apt-cache show can give you multiple versions which are found from repos. With my N800 apt-cache prints both versions 0.52-14 and 0.52-8 of osso-esd but only newer one is installed. Maybe some of the repos I have in use have old versions available too.

Use dpkg -l osso-gpsd to verify your installed package versions.

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jussik	2008-02-05 , 19:08
Posts: 139 \| Thanked: 24 times \| Joined on Sep 2005	#65

Originally Posted by mikkov

apt-cache show can give you multiple versions which are found from repos. With my N800 apt-cache prints both versions 0.52-14 and 0.52-8 of osso-esd but only newer one is installed. Maybe some of the repos I have in use have old versions available too.

Use dpkg -l osso-gpsd to verify your installed package versions.

Bloody hell, that's it. You guys all have repository.maemo.org enabled and only noticed the last version that was mentioned? That must be it. If you (Christian K, superbondbond) can check this, that would be cool.

Another way to check is "apt-cache policy osso-gpsd"

Last edited by jussik; 2008-02-05 at 19:11.

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Christian K	2008-02-05 , 19:36
Posts: 9 \| Thanked: 1 time \| Joined on Feb 2008	#66

That's it, apt-cache policy gives me the latest version.

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	superbondbond	2008-02-05 , 20:06
	Posts: 103 \| Thanked: 31 times \| Joined on Sep 2006 @ US	#67

Same here.

"apt-cache policy osso-gpsd" returns version 1.0-25

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jussik	2008-02-05 , 20:09
Posts: 139 \| Thanked: 24 times \| Joined on Sep 2005	#68

All right, three pages later we're back in square one

Thanks for checking.

What I still do not understand is how these two facts can be both true:

I tested the GPS _extensively_ in the beginning of January (on OS v50-2 with osso-gpsd 1.0-25) and decided it was absolute crap. Now, after patching the leap-year-bug it's dramatically better. Others have similar experiences.
osso-gpsd maintainer says leap-year-fix could not help fix-times (and I believe him)

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fms	2008-02-05 , 20:37
Posts: 1,418 \| Thanked: 1,541 times \| Joined on Feb 2008	#69

Originally Posted by jussik

I tested the GPS _extensively_ in the beginning of January (on OS v50-2 with osso-gpsd 1.0-25) and decided it was absolute crap. Now, after patching the leap-year-bug it's dramatically better. Others have similar experiences.

osso-gpsd maintainer says leap-year-fix could not help fix-times (and I believe him)

I suppose the only logical course of action would be to go into gpsd 1.0-25 and see how exactly the timestamps are used. This way you can verify maintainer's statement.

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lardman	2008-02-05 , 20:39
Posts: 2,102 \| Thanked: 1,309 times \| Joined on Sep 2006	#70

Really gpsd should have no effect on the fix speed, etc., as this is handled at a lower level (i.e. gpsdriver is the one which saves the last fix location and feeds it back to the gps hardware).

Note the "should" in that sentence, it is possible that gpsdriver uses data passed back from gpsd to avoid processing the data twice (or perhaps to ensure that it only rewrites the file once a fix has been found).