I understand this has been asked few times and I've read through few threads as swell but I didn't understand everything: I've read AMD graphics drivers and fglrx: No matching Device section for instance... found. how to fix it?. Both are helpful.
I'm using Ubuntu 14.04 (Gnome/KDE) -- not using Unity.
- When I use proprietary drivers
a. in KDE the desktop looks like its zoomed in but when any app is opened it looks good
b. in GNOME everything looks like zoomed in
- For open source drivers everything looks good.
I've a TV with speaker connected to HDMI and audio system connected to SPDIF port. I can't seem to get audio out from HDMI
a. When I switch output in KDE then I can run test and hear sound from TV.
b. In GNOME I don't even see option of master audio as HDMI.
Can someone explain these things?
The sound device on your HDMI should appear the same whether you use Proprietary (fglrx) or Open Source (Mesa) drivers.
On AMD cards it is run through the ALSA drivers, and is on a separate PCI sub-device as far as software is concerned.
You probably simply do not have it set as your default sound output. You should be able to do this in the appropriate audio settings for your desktop environment(s).