Title: Issue#3 - Linux Kernel Issue in v4.8 to 4.17
Summary: In linux kernel verion 4.8 to 4.17, support to contorl the LEDs on the Delcom USB Visual Indicators was added. This support cause the USB HID event (such as the Keycode, Mouse and Joystick to not work. As well as defaulted the LED PWM values to 0%. This web note describes how to reslove this issue.
Date: Jan 24, 2018 -Updated September 11, 2019
Effects: Linux kernel versions v4.8 to 4.17.
All Delcom USB device with USB VID=0xFC5 and PID=0xB080.
With the release of the Linux Kernel v4.8 driver support was added for the Delcom USB HID Visual Indicator device. This driver (drivers/hid/hid-led.c) allows the user to control the USB light. When this driver was added the Delcom device was also added to the hid_have_special_driver list in hid-quirks.c file. This causes the Delcom device to no longer work as a HID device winch disables the USB HID Keycode, Mouse and Joystick events. The hid-led.c driver also changed the PWM values on the LED ports to zero when the device is opened.
Linux kernel links:
Delcom support corrected
Delcom support removed
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