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Tried a lot of options described here, here, here and on other forums but neither worked for me .

Tried a number of grub parameters including acpi=force reboot=acpi as well as all sorts of reboot params as described in this answer.

There are no problems with reboot however, only with power off (system shuts down to a black screen and then I have to hold the HW shutdown button to switch the computer off)

Any suggestions/thoughts on how to fix this specific problem?

vir us
  • 151

1 Answers1

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UPDATE:

It appeared that this problem was caused by the fact that I've switched off the intel graphic driver with nomodset boot parameter while I was trying to fix laggish/screen redraw problem. I was able to fix the original problem with i915.enable_psr=0 boot parameter so no need for nomodset anymore and this problem went away. I'll leave it here anyways in case it might help someone.

ORIGINAL ANSWER:

This boot command finally fixed the problem for me:

pci=nommconf

Here is how one can add it:

  1. in terminal type sudo -i (enter root shell)
  2. then gedit /etc/default/grub
  3. Find the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
  4. Change to: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pci=nommconf"
  5. Save and close the file.
  6. again, in terminal update-grub
  7. and finally exit (to end the root shell)

Hope that helps someone

vir us
  • 151