the audio can't work on Lenovo machines with dual analogue codecs under ubuntu 18.04
| Affects | Status | Importance | Assigned to | Milestone | |
|---|---|---|---|---|---|
| HWE Next |
Fix Released
|
Undecided
|
Unassigned | ||
| alsa-lib (Ubuntu) |
Fix Released
|
Critical
|
Hui Wang | ||
| Bionic |
Fix Released
|
Undecided
|
Unassigned | ||
Bug Description
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.
SRU Document:
[Impact]
We have several Lenovo machines like Lenovo P520 which have 2 analogue audio codecs on them, the internal speaker and front headset are connected to the 1st codec, the Rear mic, Line in and Line out are connected to the 2nd codec. So far, under ubuntu 18.04 with the alsa-lib/libasound2 v1.1.3-5, only the audio devices (internal speaker and front headset) on the 1st codec can work. To make all audio devices work on this machine, upstream provided 3 patches for kernel audio driver and 5 patches for alsa-lib. The kernel patches are already in the linux-4.12, so this is not a problem anymore under 18.04 since we use linux-4.15 in 18.04. For the 5 patches of alsa-lib, we need to backport them to v1.1.3-5, the 5 patches are list as below:
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+)
Some explanation for these 5 patches, to make the audio work, the alsa-lib needs to add an audio configuration file and verb conf file for lenovo machines with dual codecs, these two files are put in a folder named by card_long_name, and the name of configuration file itself is also named by card_long_name, this is implemented by the patches of NO. 3rd and 5th.
But the alsa-lib v1.1.3-5 itself doesn't support to search conf file with card_long_name, it only support searching with card_name, So we need to backport 3 patches to let alsa-lib v1.1.3-5 support to search with card_long_name, these 3 patches are No. 1st, 2nd and 4th.
[Test Case]
On the Lenovo machines with dual codecs (p520), I insatlled the libasound2 v1.1.3-5ubuntu1 and libasound2-data v1.1.3-5ubuntu1, the alsa-lib can find the conf file and can parse the conf file successfully, and I tested the internal speaker, front headset, rear mic, line out and line in, all audio devices work well.
On a HP and Dell machines without dual codecs, I insatlled the libasound2 v1.1.3-5ubuntu1 and libasound2-data v1.1.3-5ubuntu1, the alsa-lib can't find conf file by card_long_name and card_name, the pulseaudio will drive the sound card as before, so all audio functions worked well as before.
[Regression Potential]
After adding these 5 patches, there 2 two changes introduced into the alsa-lib v1.1.3-5ubuntu1:
1) before: only have folder and conf files named by card_name; after: has one folder and conf file named by card_long_name, this folder and conf file will not affect others,
2) before: the ucm parser will search the conf file/folder by card_name only; after: the ucm parser will search the conf file/foler by card_long_name first, if it fails, it will fallback to use card_name to search again. So this change is compatible with old version.
There is no regression since there is only one folder named by card_long_name in v1.1.3-5ubuntu1, if it runs on lenovo machine with dual codecs, it will find the conf file by card_long_name, if it runs on other machines, the search by card_long_name will definitely fail and fall back to search by card_name, then it will be same as before. So the objective of these 5 patches is to let lenovo machines with dual codecs find the conf file by card_long_name, let other machines fail to search by card_long_name, then fallback to original searching method - search by card_name.
[Other Info]
Since I could not find the alsa-lib repository in canonical, I just generated the debdiff with "apt-get source ...".
| affects: | pulseaudio (Ubuntu) → alsa-lib (Ubuntu) |
| summary: |
- the audio can't work on Lenovo machines with dual analogue cocecs - underubuntu 18.04 + the audio can't work on Lenovo machines with dual analogue codecs under + ubuntu 18.04 |
| tags: | added: originate-from-1735041 sutton |
| Changed in alsa-lib (Ubuntu): | |
| assignee: | nobody → Hui Wang (hui.wang) |
| Timo Aaltonen (tjaalton) wrote | #3 |
| Hui Wang (hui.wang) wrote | #4 |
| Launchpad Janitor (janitor) wrote | #5 |
| Changed in alsa-lib (Ubuntu): | |
| status: | New → Fix Released |
| Changed in alsa-lib (Ubuntu Bionic): | |
| status: | New → In Progress |
| Hui Wang (hui.wang) wrote | #6 |
| Timo Aaltonen (tjaalton) wrote Please test proposed package | #7 |
| Changed in alsa-lib (Ubuntu Bionic): | |
| status: | In Progress → Fix Committed |
| tags: | added: verification-needed verification-needed-bionic |
| Hui Wang (hui.wang) wrote | #8 |
| tags: |
added: verification-done verification-done-bionic removed: verification-needed verification-needed-bionic |
| Łukasz Zemczak (sil2100) wrote Proposed package upload rejected | #9 |
| Łukasz Zemczak (sil2100) wrote | #10 |
| Launchpad Janitor (janitor) wrote | #11 |
| Changed in alsa-lib (Ubuntu Bionic): | |
| status: | Fix Committed → Fix Released |
| Łukasz Zemczak (sil2100) wrote Update Released | #12 |
| Changed in hwe-next: | |
| status: | New → Fix Released |
This tarball file contains those 5 patches mentioned in the bug description.