Hui Wang, Yes, this solves the noise issue. Both the modprobe method from Lenovo forum and the command you provided work perfectly. Thank you, and thank you James!
I still have quiet sound initially. And, now that I compared it to the kernel without the 0x12 line, it seems that the sound is quieter also after replugging the headphones (which must be dome while sound is playing). It's about 20dB lower before replugging and about 10dB lower after, and perhaps less bassy, though I may be imagining things here. I'm testing it with http://www.vygo.net/hda/11-Ultimatum.ogg which has strong bass indeed. But I understand that you can reproduce it, so I trust in you :) Many thanks for solving the noise issue, and happy new year! Vadim. -- 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
