Hi,
I'm currently running Fedora 26 on Lenovo T450s laptop, running Linux 4.12 kernel, and there's an annoying bug with the sound support. Basicly after proper (power cycle) boot everything works fine, both the laptop internal speakers, and also headphones are correctly detected when I plug them in to the headphone jack/port, and the headphones work OK, I can listen to music just fine.
But.. after a while, most probably after some laptop suspend/resume cycles, the headphone output stops working. Headphones are still detected OK when I plug them in, and *everything* looks correct in sound control applet and in pavucontrol, but there's no audio coming out from the headphones. All the alsa/pulseaudio settings are 100% correct, but there's only silence.. Nothing seems to help.. until I suspend/resume the laptop again, and then it works OK again..
Any idea what might cause that? It feels like a kernel sound driver bug to me.. Basicly the driver fails to initialize the headphone jack/output sometimes when it resumes from suspend/sleep?
I've seen this same issue happening also earlier when I was running Fedora 24, with older Linux kernel versions. So it's not a new bug.. it has been there for many kernel releases already.
Any ideas how to fix it? Do other people have the same issue?
$ cat /proc/asound/cards
0 [HDMI ]: HDA-Intel - HDA Intel HDMI
HDA Intel HDMI at 0xe1230000 irq 47
1 [PCH ]: HDA-Intel - HDA Intel PCH
HDA Intel PCH at 0xe1234000 irq 46
$ dmesg | grep -i hda
[ 8.448592] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 8.479972] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC3232: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[ 8.479974] snd_hda_codec_realtek hdaudioC1D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 8.479975] snd_hda_codec_realtek hdaudioC1D0: hp_outs=2 (0x16/0x15/0x0/0x0/0x0)
[ 8.479976] snd_hda_codec_realtek hdaudioC1D0: mono: mono_out=0x0
[ 8.479976] snd_hda_codec_realtek hdaudioC1D0: inputs:
[ 8.479977] snd_hda_codec_realtek hdaudioC1D0: Dock Mic=0x19
[ 8.479978] snd_hda_codec_realtek hdaudioC1D0: Mic=0x1a
[ 8.479979] snd_hda_codec_realtek hdaudioC1D0: Internal Mic=0x12
[ 8.481799] input: HDA Intel HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/sound/card0/input10
[ 8.481881] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input11
[ 8.481940] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input12
[ 8.481992] input: HDA Intel HDMI HDMI/DP,pcm=9 as /devices/pci0000:00/0000:00:03.0/sound/card0/input13
[ 8.482047] input: HDA Intel HDMI HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:03.0/sound/card0/input14
[ 8.507015] input: HDA Intel PCH Dock Mic as /devices/pci0000:00/0000:00:1b.0/sound/card1/input16
[ 8.507095] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card1/input17
[ 8.507157] input: HDA Intel PCH Dock Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card1/input18
[ 8.507404] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card1/input19
$ lsmod | grep -i snd
snd_usb_audio 196608 0
snd_usbmidi_lib 32768 1 snd_usb_audio
snd_rawmidi 32768 1 snd_usbmidi_lib
snd_hda_codec_realtek 90112 1
snd_hda_codec_hdmi 49152 1
snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
snd_hda_intel 40960 11
snd_hda_codec 126976 4 snd_hda_intel,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
snd_hda_core 81920 5 snd_hda_intel,snd_hda_codec,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_codec_realtek
snd_hwdep 16384 2 snd_hda_codec,snd_usb_audio
snd_seq 65536 0
snd_seq_device 16384 2 snd_seq,snd_rawmidi
snd_pcm 102400 5 snd_hda_intel,snd_hda_codec,snd_usb_audio,snd_hda_core,snd_hda_codec_hdmi
snd_timer 32768 2 snd_seq,snd_pcm
snd 77824 36 snd_hda_intel,snd_hwdep,snd_seq,snd_hda_codec,snd_usb_audio,snd_timer,thinkpad_acpi,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_usbmidi_lib,snd_seq_device,snd_hda_codec_realtek,snd_pcm
soundcore 16384 1 snd
Thanks,
-- Pasi
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