https://bugs.kde.org/show_bug.cgi?id=213708 Summary: Slideshow wallpaper disrupts system responsiveness
when changing
Product: plasma
Version: unspecified
Platform: Gentoo Packages
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
AssignedTo:
plasma-bugs@...
ReportedBy:
matt@...
Version: (using KDE 4.3.3)
Compiler: gcc (Gentoo 4.4.2 p1.0) 4.4.2
OS: Linux
Installed from: Gentoo Packages
Whenever the slideshow desktop wallpaper changes the wallpaper, the entire
system comes to grinding halt for a second or two. It is as though decoding
and/or scaling the new wallpaper are being done in a very high-priority thread,
and everything else has to wait. Even keyboard input queues up and is only
processed by the foreground application after the wallpaper changes.
If it matters, I am using a single 2560x1600 monitor on an NVIDIA GeForce 8600
GT (PCI-E 16x, 256 MB) with the 190.42 NVIDIA proprietary driver. My
wallpapers are typically 1920x1200 or 2560x1600 JPEGs that are 0.5 to 2 MB in
size, so decoding and potentially scaling them is not a trivial computational
task. I have compositing enabled in X and in KWin.
An interesting note is that a completely independent X.org X11 server instance
(a separate X process running on a different virtual terminal, with only
MPlayer as a client, no KDE at all, not even KWin) suffers from the same
periodic, momentary hang caused by the wallpaper changing in the first X
instance. This leads me to believe it's not a problem in the X server, since
the second, independent X process is also affected by the wallpaper changing.
Could the wallpaper change be done in a lower-priority thread so as not to
disrupt system responsiveness? It doesn't really matter if it takes several
seconds to render the new wallpaper if I don't notice it happening. At
present, I definitely notice it because everything stops responding briefly.
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