[Bug 1813765] Re: Regression/crash in i915 for 4.15.0-44.47

Initial summary of the changes affecting i915 specifically:

gitlog Ubuntu-4.15.0-43.46..Ubuntu-4.15.0-44.47 -- drivers/gpu/drm/i915
d2da7cbf2ae0 2019-01-14 09:28:55 +0000 N Ville Syrjälä drm/i915: Fix PIPESTAT irq ack on i965/g4x
e417085e7913 2019-01-14 09:28:55 +0000 N Lyude Paul drm/i915/dp: Send DPCD ON for MST before phy_up
0f5eea60a4f8 2019-01-14 09:28:55 +0000 N Kenneth Graunke drm/i915: Enable provoking vertex fix on Gen9 systems.


** Summary changed:

- Freeze on Lenovo laptop in dock station
+ Regression/crash in i915 for 4.15.0-44.47

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Title:
Regression/crash in i915 for 4.15.0-44.47

Status in linux package in Ubuntu:
Confirmed

Bug description:
I have a Lenovo T470s laptop with a Thinkpad Ultra dock.

After upgrading kernel to 4.15.0-44, the system freeze and has to be
hard reset (hold power button for 7 seconds) when booting, unlocking
or changing display configuration when in dock.

I downgraded the kernel to 4.15.0-43 and the problem went away.

(The system information is collected after downgraded the kernel to
4.15.0-43 and removing 4.15.0-44.)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-44-generic (not installed)
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
Uname: Linux 4.15.0-43-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: mikaelstaldal 2219 F.... pulseaudio
CurrentDesktop: Unity:Unity7:ubuntu
Date: Tue Jan 29 13:20:45 2019
HibernationDevice: RESUME=UUID=3c08f9f9-c1a9-43fa-97c9-5dc4873f87d9
InstallationDate: Installed on 2018-10-12 (108 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
MachineType: LENOVO 20HF004UMX
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-43-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
RelatedPackageVersions:
linux-restricted-modules-4.15.0-43-generic N/A
linux-backports-modules-4.15.0-43-generic N/A
linux-firmware 1.173.3
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/27/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: N1WET25W (1.04 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HF004UMX
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1WET25W(1.04):bd12/27/2016:svnLENOVO:pn20HF004UMX:pvrThinkPadT470s:rvnLENOVO:rn20HF004UMX:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T470s
dmi.product.name: 20HF004UMX
dmi.product.version: ThinkPad T470s
dmi.sys.vendor: LENOVO

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