Bug#943585: kwin-x11: kwin (?) causes extreme flickering and tear on login
A followup: Just noticed I had a file in xorg.conf.d called 20-
intel.conf. Not sure where this file came from (it's quite possible I
made it myself when trying to debug something since forgotten) and
it seemed more-or-less empty; it's entire contents are:
Section "Device"
Identifier "card0"
Driver "intel"
#Option "AccelMethod" "uxa"
EndSection
Given those contents, I would've presumed there'd be no difference to
the default settings. Yet if I remove that file from xorg.conf.d, the
graphical issues that I was experiencing in kwin_x11 are gone!
Stefan, I don't suppose you might have something similar going on
with your system?
Peace,
Brendon
On Sunday, October 27, 2019 12:06:25 P.M. EST Brendon Higgins
wrote:
> Hi,
>
> I've encountered similar behaviour: black/residual/flickering
windows
> making the desktop unusable after login. I also noticed some minor
(white)
> flickering in SDDM prior to login, although it was still quite usable at
> that point. I'm running a mixed testing/unstable system, and am
also using
> an Intel display chip (Dell Latitude; only on-board, no discrete
graphics
> chip).
>
> I found disabling OpenGL compositing with ALT+SHIFT+F12 worked
around
> it at first, as did downgrading KDE+QT packages back to testing. I'm
just
> trying this now with unstable packages again, and running the
suggestsed
> 'DRI_PRIME=1 kwin_x11 --replace'also seems to work - even as the
new
> kwin_x11 instance brings OpenGL compositing back with it.
>
> Peace,
> Brendon
>
> On Sun, 27 Oct 2019 01:15:10 +0200 Stefan Schwarzer
>
> <stefan.schwarzer@gmx.net> wrote:
> > Package: kwin-x11
> > Version: 4:5.14.5-1+b1
> > Severity: important
> >
> > Dear Maintainer,
> >
> > I am following debian unstable, desktop X11/sddm/kde on a
Lenovo laptop
>
> T460p.
>
> > The nvidia graphics on the laptop is disabled in favor of the chipset
>
> graphics
>
> > (Intel).
> >
> > After the last upgrade (which was from testing to stable on the
25th
>
> October),
>
> > I am experiencing a mostly unusable desktop. The login screen
(sddm)
>
> comes up
>
> > as expected,
> > but right after login I get flickering black rectangles on the screen,
> > which may
> > cover up to 90% of its area. Windows mostly remain black or their
content
> > suddenly
> > becomes visible he task bar remains black and I see other
residuals of the
>
> kde
>
> > splash
> > screen where windows should be drawn or the background
wallpaper be
> > restored. Swithing to a VT; all seems ok, kwin, the desktop and
> > applications are
> > running.
> >
> > So far, my only clue as to what may be going on is a workaroud: if I
start
> > a terminal
> > via keyboard shortcut and issue blindly
> >
> > DRI_PRIME=1 kwin_x11 --replace
> >
> > then afterwards things behave mostly normally (Sometimes
window
>
> contaent is
>
> > still
> > not correctly updated). I just picked this line up from older bug
reports
> > against kwin on the net without understanding what it does.
> >
> > This is the output of kwin following this command in the hope that
it
> > helps
> >
> > OpenGL vendor string: Intel Open Source Technology
> > Center
> > OpenGL renderer string: Mesa DRI Intel(R) HD Graphics
530
> > (Skylake GT2)
> > OpenGL version string: 4.5 (Core Profile) Mesa 19.2.1
> > OpenGL shading language version string: 4.50
> > Driver: Intel
> > GPU class: Unknown
> > OpenGL version: 4.5
> > GLSL version: 4.50
> > Mesa version: 19.2.1
> > X server version: 1.20.4
> > Linux kernel version: 5.3
> > Requires strict binding: yes
> > GLSL shaders: yes
> > Texture NPOT support: yes
> > Virtual Machine: no
> >
> >
> >
> > -- System Information:
> > Debian Release: bullseye/sid
> >
> > APT prefers unstable
> > APT policy: (990, 'unstable'), (500, 'testing'), (500, 'stable'), (1,
>
> 'experimental')
>
> > Architecture: amd64 (x86_64)
> > Foreign Architectures: i386
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