The correct solution to the problem I've been facing was finally solved
on comment #58, thanks @prasanth-s-cmi. I've contacted the kernel
developer responsible for these patches introduced around Linux 4.16.1
on , and he will
blacklist my laptop model (Lenovo G40-80) for newer versions of Linux.
Meanwhile, `ahci.mobile_lpm_policy=0` can workaround this problem.

** Bug watch added: Red Hat Bugzilla #1571330

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  Random unrecoverable freezes on Ubuntu 18.10

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Bug description:
  First thing I notice is that the mouse cursor freezes as I'm using it,
  then I hit the CAPS LOCK key and the LED indicator doesn't respond.
  Then I try the "REISUB" command, but it doesn't do anything either.
  Only a hard reset works, pressing down the power button for a few

  How to reproduce?
  I couldn't figure out a consistent method. It is still random to me.

  Version: Ubuntu 4.18.0-10.11-generic 4.18.12
  System information attached.

  Also happens under Arch Linux and Fedora.
  I've talked to another user on IRC who seems to be having the same freezes.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: linux-image-4.18.0-10-generic 4.18.0-10.11
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.10-0ubuntu13
  Architecture: amd64
   /dev/snd/controlC1:  dsilva     1213 F.... pulseaudio
   /dev/snd/controlC0:  dsilva     1213 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Sat Oct 20 09:54:50 2018
  InstallationDate: Installed on 2018-10-20 (0 days ago)
  InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
  MachineType: Dell Inc. Inspiron 5458
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.18.0-10-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=1
   linux-restricted-modules-4.18.0-10-generic N/A
   linux-backports-modules-4.18.0-10-generic  N/A
   linux-firmware                             1.175
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 02/02/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15 09WGNT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvrA15:bd02/02/2018:svnDellInc.:pnInspiron5458:pvr01:rvnDellInc.:rn09WGNT:rvrA00:cvnDellInc.:ct9:cvr: Inspiron 5458
  dmi.product.sku: Inspiron 5458
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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