APPLIED/cmnt[Artful]: [SRU][Artful][OEM][PATCH 0/2] speaker can't output sound anymore after system resumes from S3 on a lenovo machine with alc257
kleber.souza at canonical.com
Thu Mar 29 16:27:12 UTC 2018
On 03/26/18 09:45, Hui Wang wrote:
> BugLink: https://bugs.launchpad.net/bugs/1758829
> The 1st patch is already in the kernel 4.15 and the 2nd patch
> is already in the 4.15 stable-queue, so will not send them to bionic
> again here.
> 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.
> 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
> Kailang Yang (2):
> ALSA: hda/realtek - New codec support for ALC257
> ALSA: hda/realtek - Fix speaker no sound after system resume
> sound/pci/hda/patch_realtek.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
Patch 1/2 had already been applied, applied only patch 2/2 to
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