indi_celestron_gps - Failed to read RA/DEC values - by: davidw

I get this "Failed to read RA/DEC values" error when connecting using KStars to my Celestron AVX mount. I'm running Ubuntu (wily) on a RPi2. Has anyone else experienced this, and/or is this a know issue? Below is the debug log from the session, and software versions are at the end. Any help would be appreciated.

INFO 64.505017 sec : Session log file /tmp/indi_celestron_gps_2016-04-08T18:56:29.log
DEBUG 74.697636 sec : Toggle Debug Level -- Scope Verbose
DEBUG 75.502239 sec : Toggle Logging Level -- Scope Verbose
DEBUG 91.053220 sec : Initializing Celestron using Kx CMD...
DEBUG 91.336533 sec : RES (x#)
INFO 91.336769 sec : Telescope is online.
DEBUG 91.336949 sec : Getting controller version...
DEBUG 91.337010 sec : CMD (V)
DEBUG 91.341731 sec : RES (05 1C 23)
DEBUG 91.341976 sec : Getting controller model...
DEBUG 91.342043 sec : CMD (m)
DEBUG 91.364547 sec : RES (14 23)
WARNING 91.364775 sec : Unrecognized model (20).
DEBUG 91.364844 sec : Getting GPS firmware version...
DEBUG 91.364905 sec : CMD (50 01 10 FE 00 00 00 02)
DEBUG 91.397612 sec : RES (07 0B 23)
DEBUG 91.397896 sec : Getting RA firmware version...
DEBUG 91.397975 sec : CMD (50 01 10 FE 00 00 00 02)
DEBUG 91.430259 sec : RES (07 0B 23)
DEBUG 91.430497 sec : Getting DE firmware version...
DEBUG 91.430568 sec : CMD (50 01 11 FE 00 00 00 02)
DEBUG 91.463149 sec : RES (07 0B 23)
DEBUG 91.464666 sec : CMD (t)
DEBUG 91.469929 sec : RES (02 23)
INFO 91.473475 sec : Mount is unparked.
DEBUG 91.474998 sec : CMD (h)
ERROR 96.477992 sec : Timeout error
SCOPE 96.483676 sec : CMD (E)
ERROR 101.489036 sec : Timeout error
ERROR 101.494879 sec : Failed to read RA/DEC values.
DEBUG 101.497569 sec : CMD (48 0E 39 11 04 08 10 FC 00)
ERROR 106.503074 sec : Timeout error
DEBUG 106.506371 sec : CMD (57 2B 28 0C 00 4F 16 0C 01)
ERROR 111.511745 sec : Timeout error
SCOPE 111.516666 sec : CMD (E)
ERROR 116.522010 sec : Timeout error
ERROR 116.524757 sec : Failed to read RA/DEC values.
DEBUG 116.525114 sec : CMD (50 02 11 24 05 00 00 00)
ERROR 121.529589 sec : Timeout error
ERROR 121.532293 sec : Error setting N/S motion direction.
SCOPE 121.532526 sec : CMD (E)
ERROR 126.537806 sec : Timeout error
ERROR 126.540447 sec : Failed to read RA/DEC values.
DEBUG 126.540816 sec : CMD (50 02 11 24 00 00 00 00)
ERROR 131.546136 sec : Timeout error
ERROR 131.550306 sec : Error stopping N/S motion.
SCOPE 131.550621 sec : CMD (E)
ERROR 136.555965 sec : Timeout error
ERROR 136.561048 sec : Failed to read RA/DEC values.
DEBUG 136.561377 sec : CMD (50 02 10 24 05 00 00 00)
ERROR 141.562059 sec : Timeout error
ERROR 141.564623 sec : Error setting W/E motion direction.
SCOPE 141.564842 sec : CMD (E)
ERROR 146.567569 sec : Timeout error
ERROR 146.570015 sec : Failed to read RA/DEC values.
DEBUG 146.570336 sec : CMD (50 02 10 24 00 00 00 00)
ERROR 151.575576 sec : Timeout error
ERROR 151.580193 sec : Error stopping W/E motion.
SCOPE 151.580414 sec : CMD (E)
ERROR 156.585696 sec : Timeout error

I'm running:
INDI Library: 1.2.0
Code $Rev$. Protocol 1.7.

KStars Version 2.5.0
KDE Frameworks 5.15.0
Qt 5.4.2 (built against 5.4.2)
The xcb windowing system