According to this, apparently it is not advisable to use both lines at the same
time:
https://devtalk.nvidia.com/default/topic/828962/screen-tearing/
At least for me, first line is enough to eliminate tearing.
** Description changed:
Kubuntu 18.04 64bits
GTX 960
==
$ uname -a
Linux yafu 4.15.0-12-generic #13-Ubuntu SMP Thu Mar 8 06:24:47 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
==
$ sudo dpkg -l | grep -i nvid
-
+
ii libnvidia-cfg1-390:amd64 390.42-0ubuntu1
amd64 NVIDIA binary OpenGL/GLX configuration library
ii libnvidia-common-390 390.42-0ubuntu1
all Shared files used by the NVIDIA libraries
ii libnvidia-compute-390:amd64 390.42-0ubuntu1
amd64 NVIDIA libcompute package
ii libnvidia-compute-390:i386 390.42-0ubuntu1
i386 NVIDIA libcompute package
ii libnvidia-decode-390:amd64 390.42-0ubuntu1
amd64 NVIDIA Video Decoding runtime libraries
ii libnvidia-decode-390:i386 390.42-0ubuntu1
i386 NVIDIA Video Decoding runtime libraries
ii libnvidia-encode-390:amd64 390.42-0ubuntu1
amd64 NVENC Video Encoding runtime library
ii libnvidia-encode-390:i386 390.42-0ubuntu1
i386 NVENC Video Encoding runtime library
ii libnvidia-fbc1-390:amd64 390.42-0ubuntu1
amd64 NVIDIA OpenGL-based Framebuffer Capture runtime
library
ii libnvidia-fbc1-390:i386 390.42-0ubuntu1
i386 NVIDIA OpenGL-based Framebuffer Capture runtime
library
ii libnvidia-gl-390:amd64 390.42-0ubuntu1
amd64 NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and
Vulkan ICD
ii libnvidia-gl-390:i386 390.42-0ubuntu1
i386 NVIDIA OpenGL/GLX/EGL/GLES GLVND libraries and
Vulkan ICD
ii libnvidia-ifr1-390:amd64 390.42-0ubuntu1
amd64 NVIDIA OpenGL-based Inband Frame Readback
runtime library
ii libnvidia-ifr1-390:i386 390.42-0ubuntu1
i386 NVIDIA OpenGL-based Inband Frame Readback
runtime library
ii nvidia-compute-390 390.42-0ubuntu1
amd64 NVIDIA computing metapackage
ii nvidia-compute-no-dkms-390 390.42-0ubuntu1
amd64 NVIDIA computing metapackage - no DKMS
ii nvidia-compute-utils-390 390.42-0ubuntu1
amd64 NVIDIA compute utilities
ii nvidia-dkms-390 390.42-0ubuntu1
amd64 NVIDIA DKMS package
ii nvidia-driver-390 390.42-0ubuntu1
amd64 NVIDIA driver metapackage
ii nvidia-kernel-source-390 390.42-0ubuntu1
amd64 NVIDIA kernel source package
ii nvidia-prime 0.8.6
all Tools to enable NVIDIA's Prime
ii nvidia-settings 390.42-0ubuntu1
amd64 Tool for configuring the NVIDIA graphics driver
ii nvidia-utils-390 390.42-0ubuntu1
amd64 NVIDIA driver support binaries
ii xserver-xorg-video-nvidia-390 390.42-0ubuntu1
amd64 NVIDIA binary Xorg driver
==============
=====
- Hello, since many versions of Kubuntu/KWin this problem of
tearing/flickering/bad refresh screen/screen synchronization when using nvidia
proprietary drivers persists. The problem is that when there are fast changes
in screen, you can see annoying horizontal lines/flashes. For example in
videos, fast scrolling in web browsers, or applications such as Blender 3D. In
Blender 3D the problem is easily verifiable and visible, simply open default
cube scene, rotate the view with middle mouse button making one vertex on top
of the cube to be in front of you, then quickly zoom in and out with the mouse
wheel.
-
- Even though this has been reported many times and marked as solved, but it
has never really been solved.
+ Hello, since many versions of Kubuntu/KWin this problem of
+ tearing/flickering/bad refresh screen/screen synchronization when using
+ nvidia proprietary drivers persists. The problem is that when there are
+ fast changes in screen, you can see annoying horizontal lines/flashes.
+ For example in videos, fast scrolling in web browsers, or applications
+ such as Blender 3D. In Blender 3D the problem is easily verifiable and
+ visible, simply open default cube scene, rotate the view with middle
+ mouse button making one vertex on top of the cube to be in front of you,
+ then quickly zoom in and out with the mouse wheel.
+
+ Even though this has been reported many times and marked as solved, but
+ it has never really been solved.
The only thing that has worked for me and solves the problem (I use it since
Kubuntu 14.04) is this workaround:
https://www.muylinux.com/2014/02/25/corregir-sincronizacion-tearing-nvidia-kde/
which consists of copying the following lines within this file kate
"/etc/profile.d/kwin.sh":
export __GL_YIELD="USLEEP"
export KWIN_TRIPLE_BUFFER=1
+ ===
+ Edit:
+ According to this, apparently it is not advisable to use both lines at the
same time:
+ https://devtalk.nvidia.com/default/topic/828962/screen-tearing/
+
+ At least for me, first line is enough to eliminate tearing.
+ ===
The question is, would it be possible for Kubuntu or nvidia maintainers
to apply that workaround by default when you install Kubuntu or nvidia
proprietary driver?
Otherwise there are a lot of new Kubuntu users having this problem over
the years.
Thank you very much.
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https://bugs.launchpad.net/bugs/1758685
Title:
[Kubuntu 18.04] Persistent tearing/screen refresh problem in KWin and
nvidia
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