# AT Commands Server & UART

**URL:** <https://forum.legato.io/t/at-commands-server-uart/4747>\
**Category:** Uncategorized\
**Created:** [October 2, 2019, 1:08pm UTC](https://forum.legato.io/t/at-commands-server-uart/4747 "2019-10-02T13:08:14Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![mrjoso](https://avatars.discourse-cdn.com/v4/letter/m/9e8a1a/32.png) [@mrjoso](https://forum.legato.io/u/mrjoso)\
**Post date:** [May 21, 2020, 2:33pm UTC](https://forum.legato.io/t/at-commands-server-uart/4747/5 "2020-05-21T14:33:40Z")

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In WP7702 the UART1 driver have the power management independent of system suspend/resume.  
UART1 wakeup can be triggered by RX or TX activity. But before it wakes up from RX, it loses several bits from the RX and then got out of sync.

The default auto suspend delay is 5 second.

root@swi-mdm9x28-wp:~# cat /sys/devices/platform/msm\_serial\_hs.0/power/autosuspend\_delay\_ms  
5000

There is a possiblility to increase this auto suspend by changing this value.  
E.g. change the suspend delay to 20 sec:

echo 20000 \> /sys/devices/platform/msm\_serial\_hs.0/power/autosuspend\_delay\_ms

Maybe there is a possiblility to disable the suspend completely.

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