** Description changed:
+ [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
+ 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
+ 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
+ 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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https://bugs.launchpad.net/bugs/1875254
Title:
Intermittent display blackouts on event
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