Please note: BIOS prior to A06 have a serious issue with de-bouncing/repeating keys under Linux, see http://en.community.dell.com/support-forums/laptop/f/3518/t/19593360. Updating to [A10](http://www.dell.com/support/home/us/en/19/Drivers/DriversDetails?driverId=DHD06&fileId=3469377694&osCode=W764&productCode=latitude-e5450-laptop&languageCode=EN&categoryId=BI) or higher is strongly reccomended.
Dell Latitude E5*50 laptops could have a "Dell Wireless 5809e Gobi™ 4G LTE Mobile Broadband Card" WWAN module installed. This WWAN device is based on the Qualcomm Gobi™.
The device id of this Gobi™ module is still missing from the ```qcserial``` devices table, so I created a udev rule which loads the ```qcserial``` module, switchs the ```bConfigurationValue``` from 2 to 1** and adds the new device id ```413c:81b1``` to the ```qcserial``` driver. Current version of the udev rule loads the ```qmi_wwan``` modules too and adds the device id to that module to allow 4G/LTE connection through modern versions of NetworkManager/ModemManager.
** By default the device is loaded in the ```cdc_mbim``` mode (see https://www.kernel.org/doc/Documentation/networking/cdc_mbim.txt) instead in the classic serial modem mode.
In the ```bin``` folder you can find an utility (```gobigps```) to easily start and stop the GPS. To be able to use this utility as normal user (more in general, to use the GPS) the user must be member of the ```dialout``` group.
You can check if the GPS is running with a simple ```cat```
The Broadcom 5880v5 used in this Latitude (id `0a5c:5804`) is supported by `pcsc-lite-ccid` starting from release 1.4.19. Fedora 21 and 22 provide version 1.4.18; `pcsc-lite-ccid-1.4.19`, backported from rawhide, can be downloaded from the following repo:
