Red Hat Bugzilla – Bug 421771
ZynAddSubFX main window uses 100% cpu on KDE with latest fltk
Last modified: 2009-01-09 02:31:43 EST
Description of problem:
This applies to both Fedora 7, and 8. Opening ZynAddSubFX on KDE results in
100% CPU useage. Mouse pointer is juddery, and when hovered over Zyns main
window the pointer is difficult to see, and move. I can click on minimize, and
Zyn minimizes to the panel, and CPU useage returns to normal. The same applies
if I open, for example my home directory, which then partially covers Zyns
main window, the CPU useage drops significantly.
If I click on close, then minimize, Zyn minimizes to the panel, and the small
window opens on KDE, asking if I want to continue without saving. Clicking on
this shuts down Zyn with no problems. The same applies if I click on banks, or
edit synth boxes on Zyns main window, then minimize Zyn. The child windows
open, and there are no problems selecting a patch, or in the case of the edit
synth on, changing parameters.
I posted this as a bug against ZynAddSubFX, but Anthony Green suggested it may
be an fltk problem, so I removed fltk-1.1.8-0.4.r5750.fc8, and replaced it
with fltk-1.1.7-1.fc5 from my FC5 install, where Zyn (on the same machine)
works ok. ZynAddSubFX now works fine on Fedora 8. I havn't tried the same on
Fedora 7, where I have the same problem, but expect the FC5 version of fltk to
resolve the problem there as well.
I had also posted the Zyn problem to the planetccrma list, to see if anyone
using KDE, had similar problems with Zyn. Someone replied saying it worked ok
for him on KDE, so it may be a problem with the F7, and F8 version of fltk,
and some graphics cards, my cyberbladei1 (trident driver) for example.
BTW. Zyn works ok on F7, and F8, if I run it on Gnome, but not on KDE.
As I've said, I havn't yet tried the FC5 version of fltk on F7, which has
fltk-1.1.8-0.3.r5750.fc7, but if a strace output for the current fltk, and
another for the FC5 version of fltk would be of any help, I'll go for it.
Version-Release number of selected component (if applicable):
Fedora 7 fltk-1.1.8-0.3.r5750.fc7
Fedora 8 fltk-1.1.8-0.4.r5750.fc8
Steps to Reproduce:
Let's see if I can whip up a new snapshot test build.
In the meantime, may be worthwhile reporting this issue to the upstream fltk
Further, here's the latest upstream snapshot, scratch build for f8:
Let me know when/if you have a chance to test this and/or report this upstream.
This may be related to a bug I was about to report. I have an application
that uses fltk. I didn't write it, but I compile it from source. When
I do so under F8 and F9 and run it the X server takes up about 50% of the
CPU. I compiled fltk myself without Xinerama enabled and the application
linked with that works fine, quite low X server CPU usage. I don't need
Xinerama, only have one monitor. The only obvious difference between the
two versions of the linked program is that the slow one includes Xinerama
and the fast one does not. So it appears there is some terrible inefficiency
with the fltk and Xinerama combination when Xinerama is not needed.
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