On checking the syslog(cat /var/log/syslog) I got following output below. Note that it keeps cumulating and filesize of syslog grows in ~GBs.
Jun 8 05:06:01 hp kernel: [ 1625.694970] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.694983] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.695634] pcieport 0000:00:1c.5: can't find device of ID00e5 Jun 8 05:06:01 hp kernel: [ 1625.695651] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.695677] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.695685] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.695692] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.695705] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.696363] pcieport 0000:00:1c.5: can't find device of ID00e5 Jun 8 05:06:01 hp kernel: [ 1625.697518] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.697538] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.697547] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.697555] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.795949] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.795971] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.795980] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.795987] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.795998] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.796647] pcieport 0000:00:1c.5: can't find device of ID00e5 Jun 8 05:06:01 hp kernel: [ 1625.796677] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.796690] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.796696] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.796702] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.796712] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.797365] pcieport 0000:00:1c.5: can't find device of ID00e5 Jun 8 05:06:01 hp kernel: [ 1625.797383] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.797395] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.797401] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.797405] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.898207] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.898234] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.898246] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.898256] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.898271] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.898927] pcieport 0000:00:1c.5: can't find device of ID00e5 Jun 8 05:06:01 hp kernel: [ 1625.898944] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.898968] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.898977] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.898983] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.898994] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.899645] pcieport 0000:00:1c.5: can't find device of ID00e5 Jun 8 05:06:01 hp kernel: [ 1625.899662] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.899696] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e5(Receiver ID) Jun 8 05:06:01 hp kernel: [ 1625.899705] pcieport 0000:00:1c.5: device [8086:9d15] error status/mask=00000001/00002000 Jun 8 05:06:01 hp kernel: [ 1625.899713] pcieport 0000:00:1c.5: [ 0] Receiver Error Jun 8 05:06:01 hp kernel: [ 1625.899726] pcieport 0000:00:1c.5: AER: Corrected error received: id=00e5 Jun 8 05:06:01 hp kernel: [ 1625.900375] pcieport 0000:00:1c.5: can't find device of ID00e5 -- 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/1588428 Title: PCI bus error on startup while booting into login screen (Kubuntu 16.04) Status in linux package in Ubuntu: Incomplete Bug description: With a HP Pavilion Notebook - 15-ab549tx, and Kubuntu 16.04, the problem is on startup error messages show up before the login screen as per attached screenshot: https://launchpadlibrarian.net/263296837/screenshot.jpg At times it is just stops at this screen and doesn't move to the login screen. Or while it shuts down it stops at this screen. WORKAROUND: Adding kernel boot parameters: pci=nomsi pci=noaer stop the messages from showing on startup, but it takes 2.5 minutes to boot. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-22-generic 4.4.0-22.40 ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8 Uname: Linux 4.4.0-22-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: abhishek 1332 F.... pulseaudio CurrentDesktop: KDE Date: Thu Jun 2 21:27:21 2016 HibernationDevice: RESUME=UUID=bf42c497-2871-4fcb-9c6f-ea792ccf35ab InstallationDate: Installed on 2016-05-13 (19 days ago) InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 003: ID 0bda:b006 Realtek Semiconductor Corp. Bus 001 Device 004: ID 04ca:0060 Lite-On Technology Corp. Bus 001 Device 002: ID 04f2:b50d Chicony Electronics Co., Ltd Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: HP HP Pavilion Notebook ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=85cd7db1-5379-4a11-84d8-0b7ed7989962 ro quiet splash pci=nomsi vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-22-generic N/A linux-backports-modules-4.4.0-22-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 03/07/2016 dmi.bios.vendor: Insyde dmi.bios.version: F.78 dmi.board.asset.tag: Type2 - Board Asset Tag dmi.board.name: 80A4 dmi.board.vendor: HP dmi.board.version: 91.1D dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnInsyde:bvrF.78:bd03/07/2016:svnHP:pnHPPavilionNotebook:pvrType1ProductConfigId:rvnHP:rn80A4:rvr91.1D:cvnHP:ct10:cvrChassisVersion: dmi.product.name: HP Pavilion Notebook dmi.product.version: Type1ProductConfigId dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1588428/+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