TW is going to switch to 5.14 kernel anyway soon, so could you try 5.14 kernel in OBS Kernel:stable without PRIME to verify whether the bug is still present or not?

(In reply to Axel Braun from comment #0)
> I did a dup from 20210810 to 20210828, and since then I noticed a very slow 
> redraw on KDE Plasma: when scolling in a terminal or in a window, the screen 
> looks 'broken' for a moment, then the rendering is back.
> 
> 30: PCI 02.0: 0300 VGA compatible controller (VGA)
>   [Created at pci.386]
>   Unique ID: _Znp.WlxwpsiDkK3
>   SysFS ID: /devices/pci0000:00/0000:00:02.0
>   SysFS BusID: 0000:00:02.0
>   Hardware Class: graphics card
>   Model: "Intel CoffeeLake-H GT2 [UHD Graphics 630]"
>   Vendor: pci 0x8086 "Intel Corporation"
>   Device: pci 0x3e9b "CoffeeLake-H GT2 [UHD Graphics 630]"
>   SubVendor: pci 0x17aa "Lenovo"
>   SubDevice: pci 0x229f 
>   Driver: "i915"
>   Driver Modules: "i915"
>   Memory Range: 0xe9000000-0xe9ffffff (rw,non-prefetchable)
>   Memory Range: 0xc0000000-0xcfffffff (ro,non-prefetchable)
>   I/O Ports: 0x4000-0x403f (rw)
>   Memory Range: 0x000c0000-0x000dffff (rw,non-prefetchable,disabled)
>   IRQ: 143 (1116926 events)
>   Module Alias: "pci:v00008086d00003E9Bsv000017AAsd0000229Fbc03sc00i00"
>   Driver Info #0:
>     Driver Status: i915 is active
>     Driver Activation Cmd: "modprobe i915"
>   Config Status: cfg=new, avail=yes, need=no, active=unknown
> 
> Switching to nvidia chipset (prime-select) the issue is gone
> Other users to confirm this issue (see factory mailing list)

confirm tgis bug

(In reply to Takashi Iwai from comment #1)
> TW is going to switch to 5.14 kernel anyway soon, so could you try 5.14
> kernel in OBS Kernel:stable without PRIME to verify whether the bug is still
> present or not?

I updated to 5.14.0, issue is still there

.

OK, then we need to report it to the upstream bug tracker.
Care to report it on gitlab.freedesktop.org issues?

BTW, which kernel was the last working one?  Was it already 5.13.x?

(In reply to Takashi Iwai from comment #6)
> BTW, which kernel was the last working one?  Was it already 5.13.x?

Yes, it was 5.13.8.
Some Plasma updates flew in between the snapshots as well - but as the Nvidia card seems to work, I would not consider this as the root cause.

I can report it, but I guess I'm lost on any question except 'what hardware are you using?'

(In reply to Axel Braun from comment #7)
> (In reply to Takashi Iwai from comment #6)
> > BTW, which kernel was the last working one?  Was it already 5.13.x?
> 
> Yes, it was 5.13.8.
> Some Plasma updates flew in between the snapshots as well - but as the
> Nvidia card seems to work, I would not consider this as the root cause.

Then please try to install again the old 5.13.8 kernel from TW history repo,
and confirm that it still works fine, ie. a kernel regression.

> I can report it, but I guess I'm lost on any question except 'what hardware
> are you using?'

Developers would ask you to provide more information with the debug option, etc.
There is nothing different from reporting to here.

(In reply to Takashi Iwai from comment #8)
> (In reply to Axel Braun from comment #7)
> > (In reply to Takashi Iwai from comment #6)
> > > BTW, which kernel was the last working one?  Was it already 5.13.x?
> > 
> > Yes, it was 5.13.8.
> > Some Plasma updates flew in between the snapshots as well - but as the
> > Nvidia card seems to work, I would not consider this as the root cause.
> 
> Then please try to install again the old 5.13.8 kernel from TW history repo,
> and confirm that it still works fine, ie. a kernel regression.

This is exactly where? (No *history* project on OBS)
 
> > I can report it, but I guess I'm lost on any question except 'what hardware
> > are you using?'
> 
> Developers would ask you to provide more information with the debug option,
> etc.
> There is nothing different from reporting to here.

Which would be the proper component? gfx-ci? Mesa? xorg?

(In reply to Axel Braun from comment #9)
> (In reply to Takashi Iwai from comment #8)
> > (In reply to Axel Braun from comment #7)
> > > (In reply to Takashi Iwai from comment #6)
> > > > BTW, which kernel was the last working one?  Was it already 5.13.x?
> > > 
> > > Yes, it was 5.13.8.
> > > Some Plasma updates flew in between the snapshots as well - but as the
> > > Nvidia card seems to work, I would not consider this as the root cause.
> > 
> > Then please try to install again the old 5.13.8 kernel from TW history repo,
> > and confirm that it still works fine, ie. a kernel regression.
> 
> This is exactly where? (No *history* project on OBS)

https://download.opensuse.org/history/

> > > I can report it, but I guess I'm lost on any question except 'what hardware
> > > are you using?'
> > 
> > Developers would ask you to provide more information with the debug option,
> > etc.
> > There is nothing different from reporting to here.
> 
> Which would be the proper component? gfx-ci? Mesa? xorg?

DRM/Intel.
  https://gitlab.freedesktop.org/drm/intel/-/issues

Thank you...after some juggling I could install the 5.13.8 Kernel again:
Operating System: openSUSE Tumbleweed 20210828
KDE Plasma Version: 5.22.4
KDE Frameworks Version: 5.85.0
Qt Version: 5.15.2
Kernel Version: 5.13.8-1-default (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-9750H CPU @ 2.60GHz
Memory: 15.4 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630

Unfortunately, the redraw issues are still there. So this is most likely a regression in Plasma?

Looks so, yes.  You can try downgrading other packages from TW history repo, too.

Tried a dup from the history version, but that causes tons of conflicts *on my workhorse*. So I'm a bit scared.
On the other hand, the tests have created so many snapshots that the original 20210810 is gone in between

@tagsys - can you easily return to a working snapshot and give it a try?

(In reply to Axel Braun from comment #13)
> Tried a dup from the history version, but that causes tons of conflicts *on
> my workhorse*. So I'm a bit scared.
> On the other hand, the tests have created so many snapshots that the
> original 20210810 is gone in between
> 
> @tagsys - can you easily return to a working snapshot and give it a try?

unfortunately no, I can't. I switched to nvidia, and bug gone.

So...which new packages arrived?
The main ones should be:
Mesa-*|21.2.0
KDE Framework 5.85.0

...if neded I can provice a full list (from /var/log/zypp/history)

I have created a bugreport with KDE Team as well https://bugs.kde.org/show_bug.cgi?id=443340

This is possibly the same as my Bug 1190200 but it's hard to be sure, since when my display "breaks", it doesn't spontaneously fix itself.

Axel, does the problem occur for you with X11, Wayland, or both?  For me, it happens with X11 but not Wayland.

(In reply to Tristan Miller from comment #17)

> Axel, does the problem occur for you with X11, Wayland, or both?  For me, it
> happens with X11 but not Wayland.

Confirmed, in Wayland it is not an issue, only in X11

Axel, I'm no longer able to reproduce my own similar problem (Bug 1190200) on Tumbleweed 20211218.  Are you still experiencing your issue?

(In reply to Tristan Miller from comment #19)
> Axel, I'm no longer able to reproduce my own similar problem (Bug 1190200)
> on Tumbleweed 20211218.  Are you still experiencing your issue?

Confirmed, looks like the last KDE update (in 20211213) fixed it!

(In reply to Axel Braun from comment #20)
> Confirmed, looks like the last KDE update (in 20211213) fixed it!

In that case, perhaps you could close this bug as RESOLVED/WORKSFORME, as I did with mine.  (Though perhaps I'll change my resolution so that it dupes this one, since the evidence is mounting that this is the same problem.)

*** Bug 1190200 has been marked as a duplicate of this bug. ***

Seems to work since the latest KDE update