I have a similar issue on Debian 9 (Stretch) on a Lenovo X1 Carbon 6th
Gen laptop.
DMI: LENOVO 20KHCTO1WW/20KHCTO1WW, BIOS N23ET63W (1.38 ) 04/20/2019
The built-in speaker volume is limited to about 20% even if the volume
is set at 100%.
The sound card is a ALC285 handled by the snd_hda_intel driver.
On my kernel (4.9.0-9-amd64 #1 SMP Debian 4.9.168-1+deb9u2
(2019-05-13)), I managed to find this work-around which addresses the
low volume issue:
Edit /etc/modprobe.d/alsa-base.conf
add the following line:
options snd-hda-intel model=nofixup
After modprobe -r/modprobe of the snd_hda_intel module (or reboot), the
volume works fine.
Hopefully this can help others facing this open issue as well.
Here is the output of lspci -vvv for the sound card:
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21) (prog-if 80)
Subsystem: Lenovo Device 225c
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 125
Region 0: Memory at 2ffb018000 (64-bit, non-prefetchable) [size=16K]
Region 4: Memory at 2ffb000000 (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: 00000000fee00278 Data: 0000
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel, snd_soc_skl
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https://bugs.launchpad.net/bugs/1465766
Title:
low sound volume
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