Comment 0 for bug 1735134

Since linux-4.4.0-98, the kernel additionally load gcserial driver for Dell Wireless DW5818/5819. The reason behind it is to support firmware switching and upgrading. However, the change makes ModemManager to use Gobi plugin for this two modules. With Gobi plugin, the modules could establish data links, but it failed to retrieve the signal state. And it caused the mmcli and nm-applet giving wrong signal strength. The modules support the MBIM protocol, so ModemManager should use Dell plugin for these two modules.

I have worked out a patch to forbid these two modules in Gobi plugin, and it does work well.