Arch Linux

m.mickey

Member

Registered: 2019-10-12

Posts: 1

No Sound via DisplayPort - Graphics working

Laptop: Microsoft Surface Pro 6

I get no audio via DisplayPort (connected TV) - graphics is working. Works with Windows 10.

$ uname -a
Linux surface 5.3.2-1-surface #1 SMP PREEMPT Thu Oct 3 01:27:31 CEST 2019 x86_64 GNU/Linux

$ dmesg | grep i915
[    3.025384] i915 0000:00:02.0: vgaarb: deactivate vga console
[    3.030575] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    3.033105] [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[    3.066842] [drm] HuC: Loaded firmware i915/kbl_huc_ver02_00_1810.bin (version 2.0)
[    3.073149] mei_hdcp mei::b638ab7e-94e2-4ea2-a552-d1c54b627f04:01: bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
[    3.078332] [drm] GuC: Loaded firmware i915/kbl_guc_ver9_39.bin (version 9.39)
[    3.088520] i915 0000:00:02.0: GuC firmware version 9.39
[    3.088523] i915 0000:00:02.0: GuC submission enabled
[    3.088525] i915 0000:00:02.0: HuC enabled
[    3.092639] [drm] Initialized i915 1.6.0 20190417 for 0000:00:02.0 on minor 0
[    3.106348] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[    3.149840] fbcon: i915drmfb (fb0) is primary device
[    3.200333] i915 0000:00:02.0: fb0: i915drmfb frame buffer device

$ sudo lspci -vvs 00:1f.3
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) (prog-if 80)
	Subsystem: Intel Corporation Sunrise Point-LP HD Audio
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 64
	Interrupt: pin A routed to IRQ 143
	Region 0: Memory at a1738000 (64-bit, non-prefetchable) [size=16K]
	Region 4: Memory at a1720000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: [50] Power Management version 3
		Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
		Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
	Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
		Address: 00000000fee004b8  Data: 0000
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel, snd_soc_skl

ALSA doesn't show an audio device for the DisplayPort:

$ aplay -L
null
    Discard all samples (playback) or generate zero samples (capture)
jack
    JACK Audio Connection Kit
pulse
    PulseAudio Sound Server
default
    Default ALSA Output (currently PulseAudio Sound Server)
sysdefault:CARD=PCH
    HDA Intel PCH, ALC298 Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    Front speakers
surround21:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    4.0 Surround output to Front and Rear speakers
surround41:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=PCH,DEV=0
    HDA Intel PCH, ALC298 Analog
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
usbstream:CARD=PCH
    HDA Intel PCH
    USB Stream Output

What to check next?