I've had these freeze issues for a while, and I've been following this
thread for a while (comment #42 helped, though I still have occasional
freezes).

Googled "Fedora random freeze" today and found this:
https://fedoraproject.org/wiki/Common_F28_bugs#Certain_laptops_.28Lenovo.29_hang_randomly

Apparently an issue in Ubuntu also:
https://www.phoronix.com/forums/forum/software/desktop-linux/1020821
-fedora-workstation-28-is-shaping-up-to-be-another-terrific-
update?p=1020982#post1020982

And the timing of these bugreports/comments coincides with when these
freezes started affecting me...

Long story short, we can try adding `ahci.mobile_lpm_policy=1` or
`ahci.mobile_lpm_policy=0` to the kernel options in grub. Supposedly
confirmed to help Lenovo G50-80, X250 and T450s. We have a G40-80 and
T470s affected on this thread, and mine's a Lenovo G500s (similar to
G50-80). Maybe it'll help? (praying that it helps)

It's possible that these freezes have multiple causes, and won't be
completely fixed even if the workaround helps at all.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1798961

Title:
  Random unrecoverable freezes on Ubuntu 18.10

Status in Linux:
  New
Status in linux package in Ubuntu:
  Triaged
Status in xserver-xorg-video-intel package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Triaged
Status in xserver-xorg-video-intel source package in Bionic:
  Invalid
Status in linux source package in Cosmic:
  Triaged
Status in xserver-xorg-video-intel source package in Cosmic:
  Invalid
Status in linux source package in Disco:
  Triaged
Status in xserver-xorg-video-intel source package in Disco:
  Invalid

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
  seconds.

  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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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 
(20181017.2)
  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
  RelatedPackageVersions:
   linux-restricted-modules-4.18.0-10-generic N/A
   linux-backports-modules-4.18.0-10-generic  N/A
   linux-firmware                             1.175
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/02/2018
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 09WGNT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA15:bd02/02/2018:svnDellInc.:pnInspiron5458:pvr01:rvnDellInc.:rn09WGNT:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Inspiron 5458
  dmi.product.sku: Inspiron 5458
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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