Message ID | 20200828025304.7390-1-hui.wang@canonical.com |
---|---|
Headers | show |
Series | The DP/HDMI audio via USB-C to DP dongle or Dell Zeus adapter can't work after suspend | expand |
On 28.8.2020 5.53, Hui Wang wrote: > BugLink: https://bugs.launchpad.net/bugs/1893290 > > Since this patch is CCed to stable kernel, I just sent this patch > to oem-5.6 kernel, our oem project is waiting for this patch to > be landed to oem-5.6 kernel first. > > [Impact] > On the Dell TGL laptop, if connecting a monitor via type-c to DP/HDMI > adapter, we will have an audio issue, that is playing the music and > suspend the system, after resuming back, the audio can't output from > DP/HDMI monitor anymore. > > [Fix] > Cherry-pick a fix from upstream, this patch is verifying the needed > converter and pin to be in the D0 state. > > [Test Case] > Connect a monitor with USB-C to DP/HDMI adapter, open the youtu.com > and playing sth, suspend the system and resume, check if the sound > could play the music, repeat 20 times, all work very well. > > [Regression Risk] > If this patch could introduce regression, it should be the power > consumption regression on Intel HDMI audio, since it makes the > converter and pin to be D0 state earlier than before. But this > impact is very small. one converter and one pin consume very little > power. > > Kai Vehmanen (1): > ALSA: hda/hdmi: always check pin power status in i915 pin fixup > > sound/pci/hda/patch_hdmi.c | 1 + > 1 file changed, 1 insertion(+) > applied to oem-5.6, thanks