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).
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=d961cfbf429b c18b38ce8d1cf8e 931482ba4a627
[1] https:/ /forums. lenovo. com/t5/ Linux-Discussio n/X1-Carbon- Gen-6-weird- audio-behaviour /m-p/4172468/ highlight/ true#M11520
[2] https:/ /youtu. be/f2kesmAO8VU