** Description changed: - Following on bugzilla #1648448. There's a constant background - "hum/whitenoise" in the headset. The tone and level change whenever - something changes on the LCD screen (window resize, GNOME expose, - click/drag a window around the screen). Muting the headset using Fn+F1 - makes the "hum/whitenoise" go away. Unmuting the headset brings the - noise back. + [Impact] + It is reported that there is constant noise on lenovo X1 machines, and after + investigating, I found this issue will happen on all Lenovo machines with the + codec alc285. + + [Fix] + According to Realtek's comment, the noise comes from PC peeb in, after + disable this pin or disable the passthrough of this pin will fix the + problem. + + [Test Case] + After applying this patch, we play sound on Lenovo P52, P72, X1 carbon and X1 + Yoda2, no noise anymore. And this patch is confirmed to work by many other + users too (https://bugzilla.redhat.com/show_bug.cgi?id=1660581, + https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/comments/38). + + [Regression Potential] + Low. This patch only apply to several lenovo machines, and it is tested + by many users already.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1817263 Title: Constant noise in the headphone on Lenovo X1 machines To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1817263/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
