[Bug 1875254] Re: Intermittent display blackouts on event

Just to give you an update from my case.
- Updated Kernel for latest - didnt work
- Ubuntu to 20.10 (daily build) issue keep persist

Decided to go hard way - backed up all my data and installe fresh 20.10
All works fine

I am thinking the problem could be that I had installed workspaces-grid
on 20.04 and that was causing the issue. Didnt show from the beginning
only when did one of the updates on 20.04 so I thought one of those
updates broke it but moving to 20.10 and having same issue made it clear
was not any of the updates. This is only my suspissions reg workspaces-
grid - I am not installing it anymore tho.

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Title:
Intermittent display blackouts on event

Status in HWE Next:
New
Status in OEM Priority Project:
New
Status in linux package in Ubuntu:
Invalid
Status in linux-oem-osp1 package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Invalid
Status in linux-oem-osp1 source package in Bionic:
Fix Released
Status in linux source package in Eoan:
Fix Released
Status in linux source package in Focal:
Fix Released
Status in linux-oem-osp1 source package in Focal:
Invalid

Bug description:
[Impact]
When audio device enters runpm D3(idle for 7 seconds) and then wakes it up to make a sound, it flicks the screen.
This behavior could be observed while plug/remove AC cable or USB disk, or open a terminal and press backsapce key.

[Fix]
This issue could be fixed by this commit, it fixes the flicker during boot-time, but it also fixes the flicker during rumtime wakeup.
1ee48a61aa57 drm/i915: Limit audio CDCLK>=2*BCLK constraint back to GLK only

Audio drivers communicate with i915 over HDA bus multiple times during system boot-up and each of these transactions result in matching
get_power/put_power calls to i915, and depending on the platform,
a modeset change causing visible flicker.

GLK is the only platform with minimum CDCLK significantly lower
than BCLK, and thus for GLK setting a higher CDCLK is mandatory.

For other platforms, minimum CDCLK is close but below 2*BCLK
(e.g. on ICL, CDCLK=176.4kHz with BCLK=96kHz). Spec-wise the constraint
should be set, but in practise no communication errors have been
reported and the downside if set is the flicker observed at boot-time.

[Test]
Verified on Dell XPS 13 9300

[Regression Potential]
Low, it fixes below commit which contains in ubuntu kernel and should have been applied on ubuntu kernel, too.
Fixes: f6ec9483091f ("drm/i915: extend audio CDCLK>=2*BCLK constraint to more platforms")

=========================================

Issues with the screen going black for a second on certain events on a dell XPS 9370 2 in 1, especially when on battery.
Seems to be a known bug in arch (https://wiki.archlinux.org/index.php/Dell_XPS_13_2-in-1_(7390)).
Last 5.6.7 kernel tested and the issues has disappears but pb with sound card.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: lucie 2232 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2020-04-25 (1 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Dell Inc. XPS 13 7390 2-in-1
Package: linux (not installed)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-26-generic root=UUID=056fd229-d014-4b3b-a581-1b646105d1ed ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-26.30-generic 5.4.30
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-26-generic N/A
 linux-backports-modules-5.4.0-26-generic N/A
 linux-firmware 1.187
Tags: focal
Uname: Linux 5.4.0-26-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 03/02/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.1
dmi.board.name: 06CDVY
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 31
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.1:bd03/02/2020:svnDellInc.:pnXPS1373902-in-1:pvr:rvnDellInc.:rn06CDVY:rvrA00:cvnDellInc.:ct31:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 13 7390 2-in-1
dmi.product.sku: 08B0
dmi.sys.vendor: Dell Inc.

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