Bug still exists on Ubuntu 16.04.6 LTS, Kernel 4.14.140. Found when looking for what was causing xrandr to reset screens to full brightness and gamma. Even if `colord` isn't culprit, life is easier with less spam in journalctl.
Ignore extra `s` in `fails` below (line wrap off) for bug report: $ journalctl | grep "failed to get session \[pid" Aug 24 08:43:54 alien colord[1366]: (colord:1366): Cd-WARNING **: fails Aug 24 08:43:54 alien colord[1366]: (colord:1366): Cd-WARNING **: fails Aug 25 07:41:51 alien colord[1366]: (colord:1366): Cd-WARNING **: fails Aug 25 07:41:51 alien colord[1366]: (colord:1366): Cd-WARNING **: fails .. (SNIP) .. Oct 22 04:33:50 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 22 04:33:50 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 23 04:34:53 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 23 04:34:53 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 24 04:36:20 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 24 04:36:20 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 25 04:36:56 alien colord[1215]: (colord:1215): Cd-WARNING **: fails Oct 25 04:36:56 alien colord[1215]: (colord:1215): Cd-WARNING **: fails -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to colord in Ubuntu. https://bugs.launchpad.net/bugs/1442050 Title: (colord:832): Cd-WARNING **: failed to get session [pid 690]: Unknown error -2 Status in colord package in Ubuntu: Confirmed Bug description: Get that error logged into journalctl (colord:832): Cd-WARNING **: failed to get session [pid 690]: Unknown error -2 ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: systemd 219-6ubuntu3 ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3 Uname: Linux 3.19.0-12-generic i686 NonfreeKernelModules: nvidia ApportVersion: 2.17-0ubuntu1 Architecture: i386 CurrentDesktop: GNOME Date: Thu Apr 9 11:57:02 2015 Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 002: ID 046d:c50e Logitech, Inc. Cordless Mouse Receiver Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: ASUSTEK COMPUTER INC P5W DH Deluxe ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-12-generic root=UUID=7b1f4a51-558f-468f-85e0-f815d2f791e1 ro SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/22/2010 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3002 dmi.board.asset.tag: To Be Filled By O.E.M. dmi.board.name: P5W DH Deluxe dmi.board.vendor: ASUSTeK Computer INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Asset-1234567890 dmi.chassis.type: 3 dmi.chassis.vendor: Chassis Manufacture dmi.chassis.version: Chassis Version dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3002:bd07/22/2010:svnASUSTEKCOMPUTERINC:pnP5WDHDeluxe:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP5WDHDeluxe:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion: dmi.product.name: P5W DH Deluxe dmi.product.version: System Version dmi.sys.vendor: ASUSTEK COMPUTER INC To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/colord/+bug/1442050/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp