Wrong resolution at unlock screen

Bug #1760068 reported by Kev Bowring on 2018-03-30
This bug affects 4 people
Affects Status Importance Assigned to Milestone
light-locker (Ubuntu)

Bug Description

After coming out of suspend - the unlock screen is at 640x480 resolution.

Expect to see unlock screen at 1920x1080 resolution.

Using nvidia-340.

Previously tested using nouveau driver where resolution at unlock screen was correct.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: light-locker 1.8.0-1ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
Uname: Linux 4.15.0-13-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.20.9-0ubuntu2
Architecture: amd64
CurrentDesktop: XFCE
Date: Fri Mar 30 11:31:20 2018
InstallationDate: Installed on 2017-09-02 (209 days ago)
InstallationMedia: Xubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170902)
SourcePackage: light-locker
UpgradeStatus: No upgrade log present (probably fresh install)

Kev Bowring (flocculant) wrote :
Sean Davis (bluesabre) wrote :

Doesn't seem to affect Intel graphics.

Card-1: Intel Haswell-ULT Integrated Graphics Controller
Card-2: NVIDIA GK107M [GeForce GT 745M]
Display Server: x11 (X.Org 1.19.6 )
drivers: modesetting,nouveau (unloaded: fbdev,vesa)
Resolution: 1920x1080@60.00hz
OpenGL: renderer: Mesa DRI Intel Haswell Mobile
version: 4.5 Mesa 18.0.0-rc5

Kev Bowring (flocculant) wrote :

doesn't affect nouveau either

Sean Davis (bluesabre) wrote :

Unable to confirm for nvidia-340, but also not sure it's fully installed. Installed via Software & Updates, and it says it's installed, but nvidia-settings has two tabs and this is inxi's output. If this is correct output, it seems to be working on nvidia-340 here.

$ inxi -G
Graphics: Card-1: Intel Haswell-ULT Integrated Graphics Controller
           Card-2: NVIDIA GK107M [GeForce GT 745M]
           Display Server: x11 (X.Org 1.19.6 )
           drivers: modesetting,nouveau (unloaded: nvidia,fbdev,vesa)
           Resolution: 1920x1080@60.00hz
           OpenGL: renderer: N/A version: N/A

Sean Davis (bluesabre) wrote :

Also no luck getting nvidia-driver-390 installed to test.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in light-locker (Ubuntu):
status: New → Confirmed
Hélio Nunes (dedalu-dedalu) wrote :

Me too. Xubuntu 18.04, fresh install.

It happens after resume from suspend and when I switch users (dm-tool switch-to-greeter). For the first user the resolution is correct:

user_a$ inxi -G
Graphics: Card: NVIDIA GT215M [GeForce GT 335M]
           Display Server: x11 (X.Org 1.19.6 ) driver: nvidia Resolution: 1600x900@59.98hz
           OpenGL: renderer: GeForce GT 335M/PCIe/SSE2 version: 3.3.0 NVIDIA 340.106

user_a$ xrandr --query
Screen 0: minimum 8 x 8, current 1600 x 900, maximum 8192 x 8192
VGA-0 disconnected (normal left inverted right x axis y axis)
LVDS-0 connected 1600x900+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
   1600x900 59.98*+
HDMI-0 disconnected (normal left inverted right x axis y axis)

But for the second user:

user_b$ inxi -G
Graphics: Card: NVIDIA GT215M [GeForce GT 335M]
           Display Server: x11 (X.Org 1.19.6 ) driver: nvidia
           Resolution: 640x480@73.00hz
           OpenGL: renderer: N/A version: N/A

user_b$ xrandr --query
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480
default connected 640x480+0+0 0mm x 0mm
   640x480 73.00*

Note: user_b screen resolution is fine if he is the only one using the system. The problem happens only when he is the second.


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