You have been subscribed to a public bug:
Environment:
Ubuntu 16.04.2 LTS
nvidia-375
I have a laptop screen with resolution 3840x2160 and external display with
resolution 3440x1440.
I am scaling laptop display to resolution 1920x1080 with
command nvidia-settings --attach CurrentMetaMode="DPY-0: nvidia-auto-select
@3440x1440 +1920+0 {ViewPortIn=3440x1440, ViewPortOut=3440x1440+0+0}, DPY-3:
nvidia-auto-select @1920x1080 +0+0 {ViewPortIn=1920x1080,
ViewPortOut=3840x2160+0+0}"
Bug: Display manager is not detecting scaled resolution correctly. Please see
the attachment.
Caused effect: When focus is on laptop display and pressing Alt + Tab the
application switcher is not shown in center of laptop display but partly in
external display.
$ apt-cache policy lightdm
lightdm:
Installed: 1.18.3-0ubuntu1.1
Candidate: 1.18.3-0ubuntu1.1
---
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: markus 3264 F.... pulseaudio
/dev/snd/controlC0: markus 3264 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-04-07 (2 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64
(20170215.2)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 8087:0a2b Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HP HP ZBook Studio G3
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-46-generic.efi.signed
root=UUID=2b78b572-05a1-4c01-b97d-9c1fea406faf ro quiet splash nomodeset
pnpacpi=off vt.handoff=7
ProcVersionSignature: Ubuntu 4.8.0-46.49~16.04.1-generic 4.8.17
RelatedPackageVersions:
linux-restricted-modules-4.8.0-46-generic N/A
linux-backports-modules-4.8.0-46-generic N/A
linux-firmware 1.157.8
Tags: xenial
Uname: Linux 4.8.0-46-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 11/02/2016
dmi.bios.vendor: HP
dmi.bios.version: N82 Ver. 01.15
dmi.board.name: 80D4
dmi.board.vendor: HP
dmi.board.version: KBC Version 11.67
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.modalias:
dmi:bvnHP:bvrN82Ver.01.15:bd11/02/2016:svnHP:pnHPZBookStudioG3:pvr:rvnHP:rn80D4:rvrKBCVersion11.67:cvnHP:ct10:cvr:
dmi.product.name: HP ZBook Studio G3
dmi.sys.vendor: HP
** Affects: lightdm (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: apport-collected xenial
--
Scaled display resolution is not detected correctly in lightdm display manager
https://bugs.launchpad.net/bugs/1681040
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