Input / Output error on a L860 wwan card
Hello everyone,
I am seeking for advises. When trying to access my WWAN card over PCI, I get the error message Input / Output error.
For example, from C, open('/dev/wwan0at0', O_RDWR)
returns -1
along the error code Input / Output error
.
Tools like minicom return the same error.
The card works fine under Windows, so the hardware is not the issue.
A few months ago, I could access the card by adding the kernel option intel_iommu=on
to the grub command line, however I observe that the behavior has changed and now the card remains unusable, probably due to system updates.
I am interested in any explanation that could help me troubleshooting, as I have limited knowledge about PCI / drivers.
Is the problem related to a PCI driver issue ?
Is it related to ModemManager / MBIM / IOSM ?
Is it related to the FCC lock ?
Thanks