@spike speigel: The tlp issue in the arch Linux wiki is unrelated. The point I was that when tlp is installed and no audio is currently playing, tlp turns off the sound card and thus the hiss disappears.
The second point I was trying to say: Of course the white noise is audible when nothing is playing, but only if audio is not muted.
@Kai-Heng Feng: Unfortunately I can't boot your kernel (BTRFS error: could not find root 8).
Could you give me the applied patch or supply a more recent kernel build?
@spike speigel: The tlp issue in the arch Linux wiki is unrelated. The point I was that when tlp is installed and no audio is currently playing, tlp turns off the sound card and thus the hiss disappears.
The second point I was trying to say: Of course the white noise is audible when nothing is playing, but only if audio is not muted.
@Kai-Heng Feng: Unfortunately I can't boot your kernel (BTRFS error: could not find root 8).
Could you give me the applied patch or supply a more recent kernel build?