fglx killing sound

System is built around a three(ish) year old Gigabyte m/b with on board sound and radeon HD 6140 graphics.
I use a DVI to HDMI into my Toshiba television as a monitor and a cable connecting the green audio port into the television for audio.
I've been using 14.04 since it was released with no problems.
Tried 14.10 but no sound so discarded it.
During May and update was released for fglrx (I tend to do all software updates just before shutting down for the day).
Next day a kernel update then next day noticed no sound.
As per various post's, played around with pulseaudio and alsamixer - still no sound.
As 15.04 was available, installed it into a new partition, checked it out and had sound.
Loaded updates, ubuntu-restricted-extras, fglrx and regular packages - no sound.
Re-installed 15.04 and updates - sound ok.
installed fglrx and no sound.
Un-installed fglrx and sound came back.
Took fglrx off 14.04 system and got sound.
Options:-
1) install fglrx to get good graphics and no sound - not really an option.
2) leave fglrx off and get sound but poor resolution - not ideal but usable.
3) get an new graphics board, either radeon or Nvidia and hope that the drivers will work better with a newer card, possibly pushing sound through an HDMI connection which I currently don't have.
4) throw the toys out of the pram and get a new m/b