I recently installed Ubuntu 18.04 on my Thinkpad x1 Carbon 7th, the machine worked without a microphone or fingerprint identifier, but apart from that it had no problem. After a click on an updated window, I have two additional problems:

  1. No audio. Sound changed to "dummy" and now audio is not working
  2. Wake up. Computer doesn't wake up, after inactivity moments.

This is the command sequence:

$ uname -r

$ aplay -l
aplay: device_list:270: no soundcards found...

$ nano /etc/default/grub

# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`

# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)

# Uncomment to disable graphical terminal (grub-pc only)

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'

# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux

# Uncomment to disable generation of recovery mode menu entries

# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"

Any idea how to fix this ?

2 Answers 2


Same problem with my Acer Swift SF514 and Ubuntu 19.10: Kernel 5.3.0-40-generic worked fine Kernel 5.3.0-42-generic has problems with sound. Kernel 5.3.0-45-generic has problems with sound. Kernel 5.3.0-46-generic has problems with sound.

So I installed Kernel 5.3.0-40-generic with: sudo apt-get install linux-image-5.3.0-40-generic and select the right version from the boot menue; still hoping that the next kernel version will do better.

Peter M


I find solution. Need manually update linux kernel from https://kernel.ubuntu.com/~kernel-ppa/mainline/

I update to 5.6.3 version and all after update fine.


  1. Download generic modules, image and headers
  2. Install from deb packages
  3. Make sudo update-grub
  4. reboot
  • Can you give some detailed insights (step by step), on howto change/downgrade the current Kernel back to the previous one, please?!
    – v2r
    Apr 8, 2020 at 0:12

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