No sound unless reboot if TV turned off

Hi,

Running ubuntu 12.04 on an Acer Revo rl70. Running Frodo. Got an HDMI cable connecting the pc to the tv. All works ok.

One annoying problem though - if I leave the pc on and turn the tv off (overnight for example) when I turn the TV back on (without rebooting the pc) then there's no sound.

If I reboot the pc after turning the tv off and on then sound works just fine.

don't want to have to reboot every time though - anyone know a way around this?

Thanks,
Mark