Okay, I built another older version of the kernel for testing.
https://people.canonical.com/~acelan/bugs/lp1875254/
BTW, 5.4.0-28 is just released today, maybe you could install that new kernel
and then try the test kernel to make sure you have a working kernel installed.
The test kernel on my XPS 13(2020) fixed the same issue as you described
and doesn't introduce any regression. The patch applied on top of
5.4.0-21/5.4.0-26 is below commit which also could be found in the
directory with the test kernel.
>From 6a3916dc7d3dab9a7f41e3619532f928dc19a954 Mon Sep 17 00:00:00 2001
From: Kai Vehmanen <kai.vehma...@linux.intel.com>
Date: Tue, 31 Dec 2019 16:00:07 +0200
Subject: [PATCH] drm/i915: Limit audio CDCLK>=2*BCLK constraint back to GLK
only
Revert changes done in commit f6ec9483091f ("drm/i915: extend audio
CDCLK>=2*BCLK constraint to more platforms"). 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.
Revert to old behaviour until better mechanism to manage
probe-time clocks is available.
The full CDCLK>=2*BCLK constraint is still enforced at pipe
enable time in intel_crtc_compute_min_cdclk().
Bugzilla: https://gitlab.freedesktop.org/drm/intel/issues/913
Fixes: f6ec9483091f ("drm/i915: extend audio CDCLK>=2*BCLK constraint to more
platforms")
Signed-off-by: Kai Vehmanen <kai.vehma...@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.ro...@intel.com>
Signed-off-by: Matt Roper <matthew.d.ro...@intel.com>
Link:
https://patchwork.freedesktop.org/patch/msgid/20191231140007.31728-1-kai.vehma...@linux.intel.com
(bacported from commit 1ee48a61aa57dbdbc3cd2808d8b28df40d938e44)
Signed-off-by: AceLan Kao <acelan....@canonical.com>
** Bug watch added: gitlab.freedesktop.org/drm/intel/issues #913
https://gitlab.freedesktop.org/drm/intel/issues/913
** Tags added: oem-priority originate-from-1873148 somerville
** Changed in: linux (Ubuntu)
Status: Confirmed => Invalid
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1875254
Title:
Intermittent display blackouts on event
Status in HWE Next:
New
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Focal:
In Progress
Bug description:
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1875254/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
