On Thu, 03 Oct 2019 06:39:19 +0200, Kai-Heng Feng wrote:
Headphone on XPS 9350/9360 produces a background white noise. The The noise level somehow correlates with "Headphone Mic Boost", when it sets to 1 the noise disappears. However, doing this has a side effect, which also decreases the overall headphone volume so I didn't send the patch upstream.
The noise was bearable back then, but after commit 717f43d81afc ("ALSA: hda/realtek - Update headset mode for ALC256") the noise exacerbates to a point it starts hurting ears.
So let's use the workaround to set "Headphone Mic Boost" to 1 and lock it so it's not touchable by userspace.
Fixes: 717f43d81afc ("ALSA: hda/realtek - Update headset mode for ALC256") BugLink: https://bugs.launchpad.net/bugs/1654448 BugLink: https://bugs.launchpad.net/bugs/1845810 Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com
Applied now. Thanks.
Takashi