** Description changed: - Steps: - 1. Install image sutton-hamming-xenial-amd64-20180110-33 - 2. Make sure system works under Intel graphic card - 3. Login system and press mute key, volume up and down keys - 4. Execute a S3 (Close lid) - 5. Open lid and try to use mute, volume up and down keys again + [Impact] + After booting up, the speaker works well. If we suspend the machine then resume + it back, the speaker can't output sound, even rebooting can't make the speaker + work, we need to power off the machine then power up the machine, the speaker + can work again. + + [Fix] + We need to add the basic support for the codec alc257 first (0001-xxx.patch), + then add hooking function for this codec and clear the bit of 15 for register + 0x57 (0002-xxx.patch). Both of these two patches come from mainline kernel. + + [Test Case] + After booting up the system, suspend the machine, then resume the machine, + test the speaker, the speaker can output sound. Repeat the testing steps many + times, the speaker still can work. + + [Regression Potential] + Very low, since the 1st patch just add the support for a new codec alc257, it + will not affect other codecs. The 2nd patch just apply a fix for alc257, it + doesn't affect other codecs too. And both of them come from mainline and + realtek.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1758829 Title: speaker can't output sound anymore after system resumes from S3 on a lenovo machine with alc257 To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1758829/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
