# USB-SS mode

**URL:** <https://forum.sierrawireless.com/t/usb-ss-mode/31127>\
**Category:** RC76\
**Created:** [November 24, 2023, 10:13am UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127 "2023-11-24T10:13:14Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![saim](https://avatars.discourse-cdn.com/v4/letter/s/c57346/32.png) [@saim](https://forum.sierrawireless.com/u/saim)\
**Post date:** [November 24, 2023, 10:13am UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127/1 "2023-11-24T10:13:14Z")

</div>

How to put the RC7620 modem in USB\_SS mode? Does modem go to USB\_SS automatically when nothing is keeping it awake? Or we need to configure it first to do that? I have R9 firmware in the RC7620 and I am communicating with it from Linux host.

Regards,  
Sai.

---

<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [November 24, 2023, 10:24am UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127/2 "2023-11-24T10:24:21Z")

</div>

does this document help?

> [@QMI interface unresponsive for first command](https://forum.sierrawireless.com/t/qmi-interface-unresponsive-for-first-command/25432/18):
>
> I tried selective suspend setting on other module SL808x. see if this document can be reused: [How to test the sleep mode for SL808X under Linux.docx](https://forum.sierrawireless.com/uploads/short-url/5mN0YGZJ0B5MFXJawZfMZ5B9Etp.docx) (13.2 KB)

---

<div class="post-metadata">

**Author:** ![saim](https://avatars.discourse-cdn.com/v4/letter/s/c57346/32.png) [@saim](https://forum.sierrawireless.com/u/saim)\
**Post date:** [November 24, 2023, 11:18am UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127/3 "2023-11-24T11:18:32Z")

</div>

I am not sure if this document is complete… after finding the correct USB device, it just lists the nodes there and not much about how to set? I could find the correct node with my dmesg info:

$ cd /sys/bus/usb/devices/1-1/  
$ cat idVendor  
1199  
$ cat idProduct  
68c0  
$ cat manufacturer  
Sierra Wireless, Incorporated  
$ ls power  
active\_duration control runtime\_status  
autosuspend level runtime\_suspended\_time  
autosuspend\_delay\_ms persist  
connected\_duration runtime\_active\_time  
$ cd power  
$ cat autosuspend  
2  
$ cat control  
on  
$ cat level  
on  
$ echo ‘auto’ \> control  
$ cat autosuspend  
2  
$ cat control  
auto  
$ cat level  
auto

---

<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [November 24, 2023, 11:22am UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127/4 "2023-11-24T11:22:49Z")

</div>

Setting auto seems to be the selective suspend mode  
Did you monitor the currect consumption?

---

<div class="post-metadata">

**Author:** ![saim](https://avatars.discourse-cdn.com/v4/letter/s/c57346/32.png) [@saim](https://forum.sierrawireless.com/u/saim)\
**Post date:** [November 24, 2023, 12:13pm UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127/5 "2023-11-24T12:13:44Z")

</div>

I see ~35 mA lower consumption, when I switch from ‘on’ to ‘auto’, so I believe this is the way to keep USB to SS? Just wanted to confirm.

Regards,  
Sai.

---

<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [November 24, 2023, 2:04pm UTC](https://forum.sierrawireless.com/t/usb-ss-mode/31127/6 "2023-11-24T14:04:19Z")

</div>

You can check whether uart has response when usb-ss mode and at+ksleep=1