I am using an X1 Carbon Gen 6 (BIOS 1.31) with Ubuntu 18.04.1 LTS, and I too experience the popping sounds in the left-channel of my headphones (this does not occur when connecting the same headphones with a 3.5mm- to-USB-C adapter to the second USB-C port).
Other than that issue, audio through the headphones sounds great and can get very loud (I typically cannot go above 58%), but audio through the speakers can get tinny/distorted and is quiet at 100%. I believe this is a known issue with the X1 Carbon's speakers and is probably unrelated to the issue at hand, but I thought it is worth mentioning since there is discussion in this thread about using the speaker's DAC for the headphones instead of the headphone's DAC. I applied the changes mentioned here [1], and the popping sounds in the left-channel of my headphones appear to have stopped. I have been using this video [2] to test before and after the changes due to its wide range of audio and vocals (quiet, normal, and loud moments). alsa-info: http://www.alsa-project.org/db/?f=d961cfbf429bc18b38ce8d1cf8e931482ba4a627 [1] https://forums.lenovo.com/t5/Linux-Discussion/X1-Carbon-Gen-6-weird- audio-behaviour/m-p/4172468/highlight/true#M11520 [2] https://youtu.be/f2kesmAO8VU -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1805079 Title: click/pop noise in the headphone on several lenovo laptops Status in linux package in Ubuntu: Fix Committed Bug description: [Impact] Lenovo told us that some linux uers reported headphone noise on Lenovo's website. After investigating, we found those Lenovo laptop mdoels all have the codec of alc285, and we can reproduce the noise problem too. [Fix] Don't use the DAC of headphone, let headphone share the DAC with speaker, the noise disappears. [Test Case] After applying this patch, we tested on Lenovo P52, P72, X1 carbon and X1 Yoda2, no noise anymore [Regression Potential] Low. This patch only apply to several lenovo machines, and after applying this patch, both speaker and headphone still work very well. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp