https://bugs.kde.org/show_bug.cgi?id=409524
Bug ID: 409524
Summary: _KDE_NET_WM_BLUR_BEHIND_REGION=0 does not cause window
backgrounds to be blurred
Product: kwin
Version: 5.16.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: rula...@wp.pl
Target Milestone: ---
SYMPTOM
Certain translucent windows that should have blurred background don't have it.
OBSERVATION 1
Extensive googling leads to the conclusion that the common way of enabling blur
on a window is to set the _KDE_NET_WM_BLUR_BEHIND_REGION property to (c32)0 on
the window. This is what the popular ForceBlur KWin script does.
OBSERVATION 2
As of kwin 5.16.2 and possibly earlier, those translucent windows for which the
xprop command merely shows:
_KDE_NET_WM_BLUR_BEHIND_REGION(CARDINAL) = 0
do NOT have blurred background.
OBSERVATION 3
For those translucent windows that DO have blurred background, xprop command
shows FOUR values that define a region (x,y,width,height relative to the
window) instead of ONE value 0.
CONJECTURE
The special single value 0 of the _KDE_NET_WM_BLUR_BEHIND_REGION xprop is
probably a "magic" value that is supposed to mean "entire window", but it is
apparently no longer thus interpreted. This might be a regression.
Operating System: Arch Linux
KDE Plasma Version: 5.16.2
KDE Frameworks Version: 5.59.0
Qt Version: 5.13.0
Kernel Version: 5.1.15-arch1-1-ARCH
OS Type: 64-bit
Processors: 8 × AMD FX(tm)-8320 Eight-Core Processor
Memory: 15,6 GiB
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