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EHS8 problem. CDC_ACM driver fails with "failed to set dtr/rts" | Telit Cinterion IoT Developer Community

June 13, 2016 - 1:19pm, 13289 views

Hello, We are using EHS8 modem +gps module. We have found that sometimes data service and modem stop working.  We have checked kernel output when that situation takes place and we get this error message:

521389.344607] cdc_acm 1- failed to set dtr/rts

The only way the recover gps / modem function is rebooting system.

We are using LInux with version:

Linux  3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux