How do I tell?Everything supports A2DP nowadays, so that's not an issue. The bigger question is, does bluetooth itself work on the laptop?
# hccontrol -n ubt0hci read_local_name bluetooth-config scanvirtual_oss_configs="btdsp"
virtual_oss_btdsp="-S -a o,-1 -C 2 -c 2 -r 44100 -b 16 -s 1024 -R /dev/null -P /dev/bluetooth/$BT_DEVICE -d btdsp -t btdsp.ctl"