Editing Wifi power saving mode
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The tablets support what is called Wifi Power Saving Mode (PSM). PSM allows the tablet to switch its wifi radio on and off several times a second to save battery. While this does greatly improve battery life (6-8 hours idle on Wifi without PSM, 3-4 days with), there are still many routers on the market which do not support PSM or have a buggy implementation and this can cause problems for the tablets. | The tablets support what is called Wifi Power Saving Mode (PSM). PSM allows the tablet to switch its wifi radio on and off several times a second to save battery. While this does greatly improve battery life (6-8 hours idle on Wifi without PSM, 3-4 days with), there are still many routers on the market which do not support PSM or have a buggy implementation and this can cause problems for the tablets. | ||
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== Issues == | == Issues == | ||
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PSM can cause some network issues even on routers with good support. Particularly with PC-to-tablet stuff like [[SSH]], connections may be dropped while idle or lag severely. There are two ways to reduce the negative impact of aggressive PSM in these situations. Either have an active network process running on the tablet (XChat in an active channel, ping to google.com, etc), or [[#Configuration|disable PSM completely]] on connections where you'll be doing a lot of work over SSH. | PSM can cause some network issues even on routers with good support. Particularly with PC-to-tablet stuff like [[SSH]], connections may be dropped while idle or lag severely. There are two ways to reduce the negative impact of aggressive PSM in these situations. Either have an active network process running on the tablet (XChat in an active channel, ping to google.com, etc), or [[#Configuration|disable PSM completely]] on connections where you'll be doing a lot of work over SSH. | ||
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== Configuration == | == Configuration == | ||
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PSM can be configured on a per-connection basis in the Connectivity control panel (Application menu -> Settings -> Control panel -> Connectivity). Under the Other tab of Advanced settings when editing a saved connection. There are 3 options available: On (Maximum), On (Intermediate), and Off (note, the WLAN transmission power setting will not significantly impact battery life—though it will impact Wifi roaming distance—and is simply there for legislative reasons). Maximum and Intermediate change the timeout period (200ms and 1000ms, respectively), and Off turns off PSM entirely. | PSM can be configured on a per-connection basis in the Connectivity control panel (Application menu -> Settings -> Control panel -> Connectivity). Under the Other tab of Advanced settings when editing a saved connection. There are 3 options available: On (Maximum), On (Intermediate), and Off (note, the WLAN transmission power setting will not significantly impact battery life—though it will impact Wifi roaming distance—and is simply there for legislative reasons). Maximum and Intermediate change the timeout period (200ms and 1000ms, respectively), and Off turns off PSM entirely. | ||
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