Hi there,

I'm using KDE neon LTS 5.8 (see screenshot) and one of the latest updates have caused some graphics glitches on the system, more exactly, two of them (or the two I have caught so far), I will try to explain :

1. The first one is kinda hard to explain. Basically, I have a "square" around the mouse cursor which always displays the last ... frame? I think "frame" is not the right word for describing it but it is the best one on my mind right now. Anyway, I have attached a screenshot, so you can see it by yourself.

2. All animations made with QMl (qt), like the KDE loading, is TOO fast, the animations ran like a racer.

Some important notes:
1. I'm using a Samsung Expert X51 laptop, which has a Nvidia 940m card.

2. These bugs only occur with Nvidia graphic card, if I switch to the integrated Intel card it's work like ever.

3. These bugs seems not to be with Nvidia driver, once I have tried to downgrade the driver and the bugs still occur. Besides that, the driver is working like ever, all games are working fine and Gnome seems fine too.

As a workaround, I'm using the Intel card now, but it is much limited, not attend my necessities at all. Could someone help me?

Screenshots

Maybe, this helps:

$ command aptitude search '?name(\-hwe\-) ?installed ?not(?automatic)' -F '%p'
linux-generic-hwe-16.04
linux-tools-generic-hwe-16.04
xserver-xephyr-hwe-16.04
xserver-xorg-hwe-16.04
xserver-xorg-input-mtrack-hwe-16.04
xwayland-hwe-16.04

1) sounds the same as: https://www.kubuntuforums.net/showthread.php?t=72149

So likely an update in the ubuntu kernel/graphics/HWE stack.

Confirmed to be working correctly is this:

#######

# 1/2) Ubuntu Part: X Window System + Linux Kernel

$ /usr/lib/xorg/Xorg -version 2>&1 | command grep -o -E '.*Operating System.*|.*[Ss]erver[^(]+' | sort

Build Operating System: Linux 4.4.0-87-generic x86_64 Ubuntu

Current Operating System: Linux neon 4.10.0-28-generic #32~16.04.2-Ubuntu SMP Thu Jul 20 10:19:48 UTC 2017 x86_64

X.Org X Server 1.19.3

xorg-server 2:1.19.3-1ubuntu1~16.04.2

#######

# 2/2) Nvidia Part: Proprietary Driver(s)

$ command aptitude search '?name(nvidia) ?installed ?not(?automatic)' -F '%p'

nvidia-340

#######

# Edit: Complete Nvidia-Data

$ command aptitude search '?name(nvidia) ?installed ?not(?automatic)' --disable-columns --display-format 'Name: "%?p"; CurrentVersion: "%?v"'

Name: "nvidia-340"; CurrentVersion: "340.102-0ubuntu0.16.04.2"

#######

Check 2 things:

1) Source of Nvidia drivers should be Ubuntu, not Nvidia.

2) Must be ZERO:
$ command aptitude search '?action(hold)' | wc -l
0

Thanks to all! I have updated the kernel as acheronuk suggested but it had not help. So I changed from Nvidia Source for the Ubuntu one, like suggested NoNameNoBlame, and then I reinstalled the driver. Works like a charm. Thanks!

Have I to close this topic? Because actually, I don't know how.

Click the "Accept this answer" at
the posting that helped You most.
So other users will find it.

Result is a Green Check Mark on Your topic's
header. Meaning: Solved.

I have the exact same issue (nvidia 960M/intel hybrid GPU)

There is a simple workaround to fix this.

If you logout of Plasma, then re-login the issue goes away.

So for time being you can workaround by

- booting up neon (to sddm login)
- go to a tty (ctrl+alt+f2)
- login then use

Code: Select all

# sudo systemctl restart sddm

- login
-> Issue has now gone until the next reboot...

I think its an Xserver issue rather than Nvidia as the older driver (which was fine is now having a same issue)

I have found the exact same problem now, had the issue on saturday the first time and reinstalled neon. I was worried that I made a mistake installing something. But your quick solution with restarting sddm helped me a lot for the time being. Thank you, hopefully there will be a fix soon.

For the sake of it, and since restarting SDDM every time is VERY annoying, there's another workaround found here
https://bugs.launchpad.net/ubuntu/+sour ... ug/1684240 - #16

Go to KDE System Settings -> Display and Monitor -> Compositor (left side) -> set "Rendering Backend" to XRender

that is a relatively new nvidia chip ,,,,,,you may get better performance out of a newer driver @ hear with a GTX-860M and the nvidia-387 driver I seam to be good ,,,,,,,,,,add

#graphics drivers (nvidia)
deb http://ppa.launchpad.net/graphics-drivers/ppa/ubuntu/ xenial main

to your sources.list ,,,,,,then

Code: Select all

sudo apt-get update && sudo apt-get install nvidia-387

VINNY