According to comment #106 it looks like the bug is still happening also
in 5.3.0-52-generic, so maybe we have just reduced the probability to
hit the bug.

Let's try a different approach.

Assuming that the bug wasn't happening in -45 and it started to happen
in -46, the bug is likely to be introduced by:

 411b24761d28 "drm/i915: Schedue request retirement in
execlists_user_end()"

that was supposed to fix a power consumption issue.

The alternative approach that I would like to try is to revert all the
commits that I backported and revert also 411b24761d28. This would re-
introduce the power consumption issue, but if we are not hitting the GPU
HANG anymore, it would tell us the exact commit that introduced the bug
and we can figure out an alternative way of fixing the power consumption
problem.

So, I've upload a new test kernel (5.3.0-52.46+lp1861395v1) with the changes 
mentioned above:
https://kernel.ubuntu.com/~arighi/LP-1861395/5.3.0-52.46+lp1861395v1/

It would be great if someone could give it a try and report if they are
still experiencing the GPU HANG bug also with this new test kernel.
Thanks!

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https://bugs.launchpad.net/bugs/1872001

Title:
  5.3.0-46-generic - i915 - frequent GPU hangs  / resets rcs0

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Eoan:
  Confirmed

Bug description:
  Hi,

  Since update to HWE kernel 5.3.0-46-generic I am experiencing frequent
  (every couple of minutes) GPU hangs and reset manifesting as 2-3
  seconds freezes of the GUI (other than the mouse pointer).

  No particular triggers identified although have Chrome / Chromium
  running with Hardware Acceleration enabled does appear to increase the
  frequency.

  I have seen incidences of these hangs in jounralctl output using
  previous kernels in the 5.3.0-xx series but they were very infrequent
  (one or twice in a week of daily usage)

  System Info
  steve@steve-Inspiron-5580:~$ inxi -SCGxxxz
  System:    Host: steve-Inspiron-5580 Kernel: 5.3.0-46-generic x86_64 bits: 64 
compiler: gcc v: 7.5.0
             Desktop: Cinnamon 4.4.8 wm: muffin 4.4.2 dm: LightDM 1.26.0 
Distro: Linux Mint 19.3 Tricia
             base: Ubuntu 18.04 bionic
  CPU:       Topology: Quad Core model: Intel Core i5-8265U bits: 64 type: MT 
MCP arch: Kaby Lake rev: B
             L2 cache: 6144 KiB
             flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx 
bogomips: 28800
             Speed: 1173 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 800 2: 
800 3: 800 4: 800 5: 800 6: 800 7: 800
             8: 800
  Graphics:  Device-1: Intel vendor: Dell driver: i915 v: kernel bus ID: 
00:02.0 chip ID: 8086:3ea0
             Display: x11 server: X.Org 1.20.5 driver: modesetting unloaded: 
fbdev,vesa resolution: 1920x1080~60Hz
             OpenGL: renderer: Mesa DRI Intel UHD Graphics (Whiskey Lake 3x8 
GT2) v: 4.5 Mesa 19.2.8 compat-v: 3.0
             direct render: Yes

  steve@steve-Inspiron-5580:~$ journalctl -b | grep i915
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: i915 0000:00:02.0: vgaarb: 
deactivate vga console
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: i915 0000:00:02.0: vgaarb: 
changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: [drm] Finished loading DMC 
firmware i915/kbl_dmc_ver1_04.bin (v1.4)
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: [drm] Initialized i915 1.6.0 
20190619 for 0000:00:02.0 on minor 0
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: fbcon: i915drmfb (fb0) is primary 
device
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: i915 0000:00:02.0: fb0: i915drmfb 
frame buffer device
  Apr 10 06:15:17 steve-Inspiron-5580 kernel: snd_hda_intel 0000:00:1f.3: bound 
0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
  Apr 10 06:16:28 steve-Inspiron-5580 kernel: i915 0000:00:02.0: GPU HANG: 
ecode 9:0:0x00000000, hang on rcs0
  Apr 10 06:16:28 steve-Inspiron-5580 kernel: i915 0000:00:02.0: Resetting rcs0 
for hang on rcs0
  Apr 10 06:31:46 steve-Inspiron-5580 kernel: i915 0000:00:02.0: Resetting rcs0 
for hang on rcs0
  Apr 10 06:37:48 steve-Inspiron-5580 kernel: i915 0000:00:02.0: Resetting rcs0 
for hang on rcs0
  Apr 10 06:40:46 steve-Inspiron-5580 kernel: i915 0000:00:02.0: Resetting rcs0 
for hang on rcs0

  I note another user has reported similar issues on the same kernel at 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861395/comments/52
  ---
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  steve      3920 F.... pulseaudio
   /dev/snd/pcmC0D0p:   steve      3920 F...m pulseaudio
  CurrentDesktop: X-Cinnamon
  DistroRelease: Linux Mint 19.3
  HibernationDevice: RESUME=none
  InstallationDate: Installed on 2019-12-27 (104 days ago)
  InstallationMedia: Linux Mint 19.3 "Tricia" - Release amd64 20191213
  MachineType: Dell Inc. Inspiron 5580
  Package: linux (not installed)
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.3.0-46-generic 
root=UUID=b0eaa5bb-0276-42d4-938f-ee6ce1627906 ro usb_storage.quirks=0bc2:2320: 
quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 5.3.0-46.38~18.04.1-generic 5.3.18
  RelatedPackageVersions:
   linux-restricted-modules-5.3.0-46-generic N/A
   linux-backports-modules-5.3.0-46-generic  N/A
   linux-firmware                            1.173.17
  Tags:  tricia
  Uname: Linux 5.3.0-46-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip input lpadmin plugdev sambashare sudo vboxusers
  _MarkForUpload: True
  dmi.bios.date: 07/02/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.4.0
  dmi.board.name: 0K0DFT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.4.0:bd07/02/2019:svnDellInc.:pnInspiron5580:pvr:rvnDellInc.:rn0K0DFT:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Inspiron
  dmi.product.name: Inspiron 5580
  dmi.product.sku: 089D
  dmi.sys.vendor: Dell Inc.

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