This tarball file contains those 5 patches mentioned in the bug description.
** Description changed: Steps: 1. Install the ubuntu 18.04 on the machine of Lenovo P520. 2. Login system. 3. Plug in an external headset to record and playback in front and rear panel. Expected result: Output and input audio should work in front and rear panel. Actual result: Front panel audio doesn't work at all. Just output audio working, input audio does't work in rear panel. + + + So far the ubuntu 18.04 just imported alsa-lib v1.1.3-5 from debian.org. + + And we have several Lenovo machines like Lenovo P520 which have 2 + analogue audio codecs on them, to make the audio work on those machines, + the kernel needs 3 patches for alsa driver, and those 3 patches are + already in the linux kernel from linux-4.12, kernel is not a blocking + issue under ubuntu 18.04: + + 7beb3a6e ALSA: hda - Support Gigabyte Gaming board with dual Realtek codecs + 56798e6b ALSA: hda - Use a helper function for renaming kctl names + ca169cc2 ALSA: hda/realtek - Add Dual Codecs support for Lenovo P520/420 + + + Besides those 3 patches for kernel, we also need 5 more patches for alsa-lib. Because the ucm configuration files are named by card_long_name, these 5 patches intends to introduce the card_long_name searching for ucm and the configuration folder/files for Lenovo machines with dual analogue codecs. the 5 patches are: + + 2b9b3f01 ucm: Assure the user input card name not to exceed max size of + card long name (it is in the alsa-lib v1.1.4) + + 4b9297e6 ucm: Load device-specific configuration file based on the card + long name (it is in the alsa-lib v1.1.4) + + b7e56af8 conf/ucm: Add dual HD-audio codecs config for Lenovo (it is in + the alsa-lib v1.1.6) + + 181f8e25 ucm: adding the folder of card_long_name when finding verb conf + file (it is in the alsa-lib v1.1.6+) + + 81db276f conf/ucm: increase the input volume for LineIn (it is in the + alsa-lib v1.1.6+) + + To backport these 5 patches to v1.1.3-5, the 3rd and 4th patch need + minor change to resolve the patch conflict. And I attached 5 patches to + this bug, these patches can be successfully applied to v1.1.3-5 without + any change. + + After applying this patches, the ucm searcher will look for folder + according to card_long_name first, if it fails, it will fallback to use + card_name as before, so these 5 patches are safe and will not introduce + any regression. ** Attachment added: "patches.tar.bz2" https://bugs.launchpad.net/ubuntu/+source/alsa-lib/+bug/1768830/+attachment/5132947/+files/patches.tar.bz2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1768830 Title: the audio can't work on Lenovo machines with dual analogue codecs under ubuntu 18.04 To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1768830/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
