Problems Connecting to TV Monitor (Opensuse 13.1)

I am running Opensuse 13.1 (x86_64) with KDE 4.11.5 (dual boot with Win 7) on a Lenovo X230 laptop with an Intel (Ivybridge Mobile) HD 4000 (i915 driver) graphics chip and a mini-displayport connector providing DP and HDMI + audio output and a VGA connector. I wish to setup a Bauhn (Aldi) HDTV (1080p - 1920×1080p) as an external monitor and audio/video system.

However, when the HDTV is connected with a DP to HDMI adaptor cable while Opensuse 13.1 is running, the HDTV display is not recognised or shown in the KDE System Settings Monitor Configuration window as an external monitor. Clicking on <I> (identify screens) has no effect. Setting (Phonon GStreamer) Audio to Digital Sterio HDMI has no effect.

Under mswin 7 this connection with a DP to HDMI adaptor cable does work in 'projector mode' with native resolution (1366x768). I have not yet tested audio or the 'external monitor mode' connection option under mswin 7.

I note that the "SDB:Connecting to TV Monitor" page relates to 12.1 and that multimedia has changed in some respects since then. I have installed pavucontrol, as suggested.

In disconnected state 'xrandr' shows:
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
LVDS1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 277mm x 156mm
1366x768 60.0*+
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I have a lot to learn and would be grateful for helpful advice from the forum.