the problem happen on my desktop (amd GPU) and two laptop (intel GPU), arch linux last version.

it is the same: it is like some part of the screen are not updated/refreshed, sometimes opening thge windows make them ppear and disappear, and thing like that.

forcing the wiondows to update (like moving it, resizing, scrolling) is a workaround for when opening a window it is not repainted.

i realli like the plasma-next, but it is too bugged, it worst than kde4 smile

here a littel example: http://youtu.be/dS5E8Hgdxgg

Please provide the output of "qdbus org.kde.KWin /KWin supportInformation"

now just retsarted is working, in a couple of minute when it will start oing that again i'll post it again, if needed
https://paste.kde.org/pusmg1go1

try

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export KWIN_EXPLICIT_SYNC=0
export KWIN_USE_BUFFER_AGE=0
kwin --replace &


you can check the output of "glxinfo" to figure whether the driver believes to support either:

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glxinfo | grep -E '(GLX_EXT_buffer_age|GL_EXT_x11_sync_object)'


glxinfo | grep -E '(GLX_EXT_buffer_age|GL_EXT_x11_sync_object)'
GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,

This means that
export KWIN_USE_BUFFER_AGE=0
will have impact.

yes, it worked.

tomorrow i'll try just export KWIN_USE_BUFFER_AGE=0

as this appen to two PC with AMD opensource driver (li found out i was wrong, the problematic laptop is an APU by AMD) but with this same driver i play 3d games without problem. Should i open a bug? is it something known? because it has been a killer bug and i didn't find anything about it.

Games will certainly not make use of the buffer age feature (they typically repaint the entire scene with every frame, because it likely changed in total)

You should file a bug against the radeon driver, GLX_EXT_buffer_age allows to re-use the former buffer and thus provides performance and battery usage improvements.

PS:
This feature is in KDE SC4 as well ;-P

weird, i come from kde4 and never had this problem.

Eventually updated the radeon driver as well?

i'm on the laptop now, and the problem persist even after the suggested step. Also tryed to get rid of blur deskop effec, still have to remove all the others.

When this appen, i just relaunch kwin and it fix it for a while

The intel chip/driver probably does not even have that feature (yet)
The video you posted was from the AMD chip? Is the intel problem *really* comparable?
Do you eventually use glamor acceleration or OpenGL 3.1 on the intel chips?

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grep -i glamor /var/log/Xorg.0.log

ah no wait, this laptop has an APU E1-1200

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% glxinfo | grep -E '(GLX_EXT_buffer_age|GL_EXT_x11_sync_object)'
    GLX_EXT_buffer_age, GLX_EXT_create_context_es2_profile,


disabling all desktop effect solve the problem, still have to check if the export have effect, but i DON'T think so, unless some magic make them persistent.


EDIT: nope, even without any desktop effect AND using export give the probem.

Please still check for glamor acceleration and confirm or deny that the problem is *really* comparable (glitch is not glitch - the video looked like old frames were painted, thus my guess on GLX_EXT_buffer_age)

the problema are the same on all PC, and all pc has AMD opensource driver