data connection lost
Bug #1955707 reported by
Slark Xiao
This bug affects 1 person
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| Cyborg (OpenStack) |
New
|
Undecided
|
Unassigned | ||
Bug Description
For Qualcomm based modem devices, with PCIE interface, and mhi driver based on kernel 5.13.0, it will lose data connection. Details as below:
Phenomenon:
1) Can NOT connect to Internet
2) /dev/wwan0p1QCDM, /dev/wwan0p2MBIM, /dev/wwan0p3AT NOT response
Reproduce steps
1) Connect Internet via cellular
2) Do speedtest(https:/
Recovery method
Only can be recovered by cold boot(Power off, then power on).
Others
It can NOT be reproduced in Windows 10/11.
Revision history for this message
| Freeman Zhang (zhanggyb) wrote | #1 |
Revision history for this message
| Slark Xiao (slarkxiao) wrote | #2 |
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(a) It's better that the modem's FW can provide the log including debug message to describe which event/command was sent from the driver to cause the modem's FW to crash.
(b) Enable the debug in ModemManager to collect the log to know the last command sent to the modem
For Ubuntu Core, to enable the modem-manager snap:
===
$ sudo snap set modem-manager debug.enable=true
$ sudo snap restart modem-manager
===