(In reply to Paulo J. Matos from comment #11) > Created attachment 144319 [details] > rc5+ kernel with enable_psr=0
The log was cut off so couldn't see that PSR was in fact disabled. You can fix that by passing eg. log_buf_len=2M to the kernel cmdline. Anyways, after a second glance at the logs I see the sink does sometimes indicate that the receiver port was not synchronized. Not sure why the failure manifests at that level with the link otherwise being reported as stable. Looks like we could try to reduce the link rate a bit and still have enough bandwidth for the 4k@60 mode. I'll attach something to that effect. -- 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/1826125 Title: Dell XPS 13 9380 flickering (Whiskey Lake) Status in Linux: Incomplete Status in linux package in Ubuntu: Confirmed Bug description: A brand new Dell XPS 13 9380 preinstalled with Ubuntu 18.04 flickers to the point of being totally unusable. I have upgraded since to 18.10 and 19.04 with no changes. I have tried several combinations of the i915 parameters fastboot, enable_rc6 and enable_fbc to no avail. Examples of flickering are here: https://photos.app.goo.gl/1PkL2HrjMBP41aML9 https://photos.app.goo.gl/CMzmMwrCPH5wh8aw6 --- ProblemType: Bug ApportVersion: 2.20.10-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: gdm 1430 F.... pulseaudio DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-bionic-amd64-20180608-47+italia-whl+X31 DistroRelease: Ubuntu 19.04 InstallationDate: Installed on 2019-04-13 (10 days ago) InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38 MachineType: Dell Inc. XPS 13 9380 Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-1035-oem root=UUID=252898e9-6e96-4705-a709-2db930b7c4c7 ro quiet splash i915.fastboot=1 i915.enable_rc6=0 vt.handoff=1 ProcVersionSignature: Ubuntu 4.15.0-1035.40-oem 4.15.18 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.15.0-1035-oem N/A linux-backports-modules-4.15.0-1035-oem N/A linux-firmware 1.178 Tags: disco Uname: Linux 4.15.0-1035-oem x86_64 UpgradeStatus: Upgraded to disco on 2019-04-24 (0 days ago) UserGroups: _MarkForUpload: True dmi.bios.date: 02/14/2019 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.2.1 dmi.board.name: 0KTW76 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.2.1:bd02/14/2019:svnDellInc.:pnXPS139380:pvr:rvnDellInc.:rn0KTW76:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: XPS dmi.product.name: XPS 13 9380 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1826125/+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
