Hi,
I think I've read somewhere here that upgrading the kernel could solve such
hardware issues.
Ah, here it is: https://trisquel.info/en/wiki/update-linux-libre-kernel
But please wait for more experienced users advice.
Maybe there's a simpler way.
Also I suppose there's no garantee with the
Updating the kernel may provide solutions. Have you checked in the "Sound"
utility (in the "System settings") whether the speakers are muted? What is
your graphics card? The command 'lspci' (to execute in a terminal) would tell
if you do not know.
Next time, avoid AMD. Their cards have the worst support in Linux-libre.
The R9 280 is pretty recent. Have you installed the latest kernel in jxself's
repository?
jxself has just uploaded in his repository a new Linux-libre kernel that
should make the radeon module work:
https://trisquel.info/forum/video-using-amd-apu
