Hi Hui Wang, While waiting for your patch to reach the mainline, I just insert these two lines myself.
However, I still have issues with the sound. Scenario: laptop is off, headphones are inserted, sound (both mic and output) is muted; I turn it on, log in etc., unmute the output and play something. The sound is often too quiet (maybe 10 to 15 dB weaker than expected). If I unplug the headphones and plug them back in, the sound level rises to expected levels, but I start hearing noise reminiscent of cheap soundcards (with grounding problems?), where the noise characteristics change with the activity of other devices (e.g., mouse movements). The noise is stronger if I touch the touchpad. If I mute the sound, the noise disappears. This does not happen if I remove the "0x12" line, whether or not I add the .chained/.chain_id lines. Interestingly, init_pin_configs in sysfs shows the same value for 0x12: $ cat /sys/class/sound/hwC0D0/init_pin_configs 0x12 0x90a60130 0x13 0x40000000 0x14 0x90170110 0x16 0x411111f0 0x17 0x411111f0 0x18 0x411111f0 0x19 0x04a11040 0x1a 0x411111f0 0x1b 0x411111f0 0x1d 0x40600001 0x1e 0x411111f0 0x21 0x04211020 (driver_pin_configs and user_pin_configs are empty.) Thank you, 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
