Bug 423996

Summary:	Lag with Quadro RTX 5000
Product:	[Plasma] kwin	Reporter:	Attila Torok <attila.torok.3d>
Component:	compositing	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	major	CC:	kde, lemmyg, nate
Priority:	NOR
Version First Reported In:	5.18.5
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	wrongdpi and system info

Description Attila Torok 2020-07-08 14:25:06 UTC

SUMMARY

First of all I must apologise if I post this issue here, but to be honest the bugreport interface is a nightmare with millions of entries! After 5 minutes of searching I started to pull my hair out to find which is the right category for this!!!

All I want to simply report is that I am getting terrible lag with the kde interface using my new Quadro RTX 5000 card. Some of the facts:

1) Installation of Kubuntu 20.04 completely fails in normal graphics mode. The text printed on the screen during loading is completely covered with bad green pixel errors. Only 'safe graphics mode' installation is possible (if that's how it is called exactly)

2) Desktop Affects and the whole KDE experience is lagish. On this system I had an AMD Radeon 7 before, which worked very fine with Pop OS 19.10/20.04 Gnome + KDE Standard combo.

3) On a fresh Kubuntu 20.04 install the mouse size changes from giant to small and back based on which interface the mouse is on. I have to force a constant mouse size which I did not have to do before.

4) The entire DPI scaling seems to be off. Please see attached picture.

I am using a 4k monitor in the middle, and two 2K monitor on the side in portrait position.

NVIDIA Driver version is 440.100 which is the default that gets installed.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Kubuntu/Pop OS 20.04
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.5
Qt Version: 5.12.8
Kernel: 5.4.0-7634-generic

Comment 1 Attila Torok 2020-07-08 14:28:15 UTC

Created attachment 129975 [details]
wrongdpi and system info

Comment 2 Attila Torok 2020-07-08 14:32:49 UTC

I do not notice similar lag on a fresh Pop OS 20.04 install which uses gnome

Comment 3 David Edmundson 2020-07-08 15:03:46 UTC

Can we try to stick to one issue per bug report.

1) That's outside our control upstream in KDE I'm afraid
2) I do have reports on that, I'm sure I can find some duplicate to track that as
4) On X, only a single scale is supported. On our wayland session we support mixed scales.

As for the lag, does this occur with and without compositing? (alt+shift+f12)

Comment 4 Attila Torok 2020-07-08 16:39:53 UTC

Thank you so much David for looking into this!

2) That would be fantastic.  I just turned off 'Enable compositor on startup' and after restart i can say that it is improved when moving windows and browsing Application Launcher, but the issue is still there while switching applications for example.

I work with Houdini (3D Application) and now it freezes the system for a second on opening and closing with having the compositor is off. This is something that was not the case before.

Thanks again!
Attila

Comment 5 galder 2022-01-26 19:46:31 UTC

this looks like an old issue. Please try with newer version or reply here if is already fixed.
Changing to need more info.

    Bugs placed into NEEDSINFO status will receive a reminder if the ticket:
        Is at least 15 days old
        Has not received any comment within 15 days
    If a bug remains in NEEDSINFO for another 15 days with no comment, it will be closed as RESOLVED > WORKSFORME.
    If a bug remains in NEEDSINFO with a comment provided within less than 15 days, no action will be taken (as it does not meet the above criteria).

Comment 6 Bug Janitor Service 2022-02-10 04:37:07 UTC

Dear Bug Submitter,

This bug has been in NEEDSINFO status with no change for at least
15 days. Please provide the requested information as soon as
possible and set the bug status as REPORTED. Due to regular bug
tracker maintenance, if the bug is still in NEEDSINFO status with
no change in 30 days the bug will be closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

If you have already provided the requested information, please
mark the bug as REPORTED so that the KDE team knows that the bug is
ready to be confirmed.

Thank you for helping us make KDE software even better for everyone!

Comment 7 Bug Janitor Service 2022-02-25 04:36:41 UTC

This bug has been in NEEDSINFO status with no change for at least
30 days. The bug is now closed as RESOLVED > WORKSFORME
due to lack of needed information.

For more information about our bug triaging procedures please read the
wiki located here:
https://community.kde.org/Guidelines_and_HOWTOs/Bug_triaging

Thank you for helping us make KDE software even better for everyone!