On Mon, 28 Aug 2017, Aaron Armstrong Skomra wrote:

Commit a50aac7193f1 introduces 'led.groups' and adds EKR support
for these groups. However, unlike the other devices with LEDs,
the EKR's LEDs are read-only and we shouldn't attempt to control
them in wacom_led_control().

See bug: https://sourceforge.net/p/linuxwacom/bugs/342/

Fixes: a50aac7193f1 ("HID: wacom: leds: dynamically allocate LED groups")
Cc: stable <redacted>     # 4.9
Signed-off-by: Aaron Armstrong Skomra <redacted>

Applied to for-4.14/upstream-fixes.

-- 
Jiri Kosina
SUSE Labs