-- BACKGROUND info -- (ie. skip!)
I upgraded to 18.04 last night from 17.10 (Ubuntu with GNOME, but also XFCE & MATE DEsktops were installed). I logged in last night & noticed nothing unusual (slow login, crash & apport bug report made [duplicate]). Otherwise upgrade was perfect. Last night I only used MATE.
-- END background
Today I logged into GNOME (first login since upgrade), my screen positional config was changed (as if side-by-side) so I altered to match my config - and now on top (secondary) screen left side of screen I get this few pixel wide graphic 'bar' type glitch.
It appears to dance when something moves on the screen (eg. cursor movement, or audio-metre bars on mp3 player (audacious). Moving the cursor alone causes minimal 'dance' in the glitch, moving a window around causes a lot higher-faster dance in the glitch. When I start music (audacious) with the audio metre (dancing with music) I get lots of activity on the glitch-bar; if music is stopped (audio-metre is static) glitch becomes minimal.
If I move audacious below screen (or out of display) screen it still acts as if on screen (my screen placement i think is reason for this; top right 1/3 of screen is to right of below screen; left 1/3 of bottom screen is to left top screen), but if I minimize the window the glitch has minimal movement, likewise if I move audacious to lower (primary) screen and move the bar off display.
As stated, the vertical-graphic-lines-glitch appears to be related to movement or redrawing of stuff on screen. If I stop music and have ~everything static but type into the `hexchat` screen on the bottom, the vertical-graphic-lines-glitch jumps on each keypress (or its being written to screen). If i hit random keys quickly the jumping movement is faster than slow keypresses
If I make no movements, glitch still has movement; maybe 2-4 moves per second., but a fraction of the 'jumps' (or movement) of when there is graphic movement.
OF NOTE: As I type this into chromium, the 'glitch' is the smallest its been and NOT moving to each keystroke which is different behavior to terms, hexchat etc. When I first login, its not evident, it takes a few minutes to become visible.
This behavior is only evident in GNOME (on X)
guiverc@d960-ubu2:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu Bionic Beaver (development branch)
Release: 18.04
Codename: bionic
guiverc@d960-ubu2:~$ sudo lshw -C video
*-display
description: VGA compatible controller
product: Cedar [Radeon HD 5000/6000/7350/8350 Series]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:30 memory:e0000000-efffffff memory:f7de0000-f7dfffff ioport:dc00(size=256) memory:c0000-dffff
guiverc@d960-ubu2:~$ sudo apt-cache policy gnome-session
gnome-session:
Installed: (none)
Candidate: 3.28.1-0ubuntu2
Version table:
3.28.1-0ubuntu2 500
500 http://ftp.iinet.net.au/pub/ubuntu bionic/universe amd64 Packages
500 http://au.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
For a bad video of what I see/mean - see https://www.youtube.com/watch?v=e5KA1as_lVA
(if it wasn't mostly white & bright-blue bars - it'd be less annoying)
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome (not installed)
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu5
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 21 13:59:30 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-11-16 (156 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: meta-gnome3
UpgradeStatus: No upgrade log present (probably fresh install)
note: I didn't know what package to put; so wrote `gnome` which became meta-gnome3 (via apport)