Inactive laptop screen fades to blank, then immediately brightens again showing the login screen, and stays lit.
This happens whether the laptop if charging or running on battery.
The problem occurs with both the gnome screensaver package installed and with xscreensaver.
Indicators in the status bar in addition to the default ones include
Classic Menu indicator
Dropbox indicator
System Load indicator
(I have been running the same set of indicators on a different, 14.04, laptop without them interfering with screen blanking behavior)
Charging with the screen lit seems very slow and discharge seems fast, but this is a new laptop that came with 16.04 installed, so I don't really have a basis for comparison.
I have not installed TLP on this laptop.
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ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: emgrasso 1464 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=26ebcc5d-ea41-40ff-8be8-03ec45a11d99
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 04f2:b550 Chicony Electronics Co., Ltd
Bus 001 Device 005: ID 8087:0a2b Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: System76, Inc. Lemur
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic.efi.signed root=UUID=d91fefd0-99fb-416c-9315-8d8e7f460e84 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.4.0-22.39-generic 4.4.8
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
Tags: xenial
Uname: Linux 4.4.0-22-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 11/29/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.05.06RS76
dmi.board.asset.tag: Tag 12345
dmi.board.name: Lemur
dmi.board.vendor: System76, Inc.
dmi.board.version: lemu6
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.05.06RS76:bd11/29/2015:svnSystem76,Inc.:pnLemur:pvrlemu6:rvnSystem76,Inc.:rnLemur:rvrlemu6:cvnSystem76,Inc.:ct10:cvrN/A:
dmi.product.name: Lemur
dmi.product.version: lemu6
dmi.sys.vendor: System76, Inc.
ubuntu-bug and its documentation makes it very hard to post a bug that is actually related to power management. I told it that it was an apport bug in order to get into the system at all.