Dell Latitude E5*50 Linux support

Tested on my Dell Latitude E5450 (late 2014) with Fedora 21 64bit, BIOS A06.

Please note: BIOS prior to A06 have serious a issue with de-bouncing/repeating keys under Linux, see http://en.community.dell.com/support-forums/laptop/f/3518/t/19593360. Updating to A06 is strongly reccomended.

WWAN module

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™.

Name	Dell Wireless 5809e Gobi™ 4G LTE Mobile Broadband Card
ID	413c:81b1
Kernel module	qcserial
Tested kernels	3.17, 3.16

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.

** 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.

GPS

To start the GPS

echo "\$GPS_START" > /dev/ttyUSB0

To stop the GPS

echo "\$GPS_STOP" > /dev/ttyUSB0

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

cat /dev/ttyUSB0

or using QGIS.

Work is still in progress!