Public bug reported:

Fairly recently I got an old HP Pavillion 14 laptop and installed
Kubuntu 17.10 on it. As far as I recall it ran fine, however, not long
after I upgraded to 18.04 and noticed frequent freezing (approx every
few hours). When this happens, all of a sudden, the screen just stays
with it's image immobile and unchanging. There is no visual corruption
onscreen and even the cursor does not move. Ctrl+alt+F[1-9] and
alt+ctrl+sysrq+RSEINUB do nothing.

Often when I look at the logs, at the end of kern.log.1 I see:

[drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe
A (start=96545 end=96546) time 394 us, min 763, max 767, scanline start
760, end 778

Sometimes, earlier on, there is also:

Could not find key with description: [d4628bf1c812c861]
process_request_key_err: No key
Could not find valid key in user session keyring for sig specified in mount 
option: [d4628bf1c812c861]
One or more global auth toks could not properly register; rc = [-2]
Error parsing options; rc = [-2]

I tested, and this also occurs in a brand new live usb of 18.04, and
noticed that it still happens there, even before any upgrades or
installation of packages (such as the wireless driver).

Other than the wireless driver, there are no proprietary drivers
installed (eg Nvidia, FGLRX etc).

Is there any more info I can provide to help troubleshoot this?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-24-generic 4.15.0-24.26
ProcVersionSignature: Ubuntu 4.15.0-24.26-generic 4.15.18
Uname: Linux 4.15.0-24-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  user       1152 F.... pulseaudio
CurrentDesktop: KDE
Date: Fri Jul 13 05:38:09 2018
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=ed1ff2d7-7aa5-4119-91ac-2720da50cb7c
InstallationDate: Installed on 2018-03-20 (115 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.2)
MachineType: Hewlett-Packard HP Pavilion 14 Notebook PC
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-24-generic 
root=UUID=dabc38a5-afcf-4cec-be94-9ee49972e248 ro quiet splash vt.handoff=1
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-24-generic N/A
 linux-backports-modules-4.15.0-24-generic  N/A
 linux-firmware                             1.173.1
SourcePackage: linux
UpgradeStatus: Upgraded to bionic on 2018-05-22 (52 days ago)
dmi.bios.date: 03/18/2015
dmi.bios.vendor: Insyde
dmi.bios.version: F.42
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: 227A
dmi.board.vendor: Hewlett-Packard
dmi.board.version: 76.35
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.chassis.version: Chassis Version
dmi.modalias: 
dmi:bvnInsyde:bvrF.42:bd03/18/2015:svnHewlett-Packard:pnHPPavilion14NotebookPC:pvr096C110800405F10000620180:rvnHewlett-Packard:rn227A:rvr76.35:cvnHewlett-Packard:ct10:cvrChassisVersion:
dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
dmi.product.name: HP Pavilion 14 Notebook PC
dmi.product.version: 096C110800405F10000620180
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1781565

Title:
  Frequent hangs / lockups with "[drm:intel_pipe_update_end [i915]]
  *ERROR* Atomic update failure on pipe A"

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