The main status for this bug is 'Invalid' which doesn't sound right. Can someone fix that up?
** Tags added: ice-lake-flicker -- 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: [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. 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
