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List:       kwin
Subject:    [Bug 174853] New: Unable to enable XRender backend from KWin KCM
From:       Christoph Feck <christoph.feck () mathe-kapiert ! de>
Date:       2008-11-11 11:34:16
Message-ID: bug-174853-4790 () http ! bugs ! kde ! org/
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http://bugs.kde.org/show_bug.cgi?id=174853

           Summary: Unable to enable XRender backend from KWin KCM (but
                    manually works)
           Product: kwin
           Version: unspecified
          Platform: Compiled Sources
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: kwin@kde.org
        ReportedBy: christoph.feck@mathe-kapiert.de


Version:            (using Devel)
Compiler:          gcc (SUSE Linux) 4.3.1 20080507 (prerelease) [gcc-4_3-branch
revision 135036] 
OS:                Linux
Installed from:    Compiled sources

This bug appeared since the selfcheck was implemented, but appearently this bug
is different from bug #170085, so I am opening a new bug report.

I will try to explain (always starting with a cleaned .kde, except
when noted below):

* Trying to enable "XRender" compositing: fails with an error message, and the
dialog resets the combobox to "OpenGL"

* Trying to disable selfcheck and enable "XRender": fails with an error
message, and the dialog resets the combobox to "OpenGL", and the selfcheck
checkbox to "off"

* Setting "DisableChecks=true" in settings file will make the dialog appear
with that checkbox set. Trying to enable "XRender" compositing: fails again,
and dialog resets the combobox to "OpenGL", but leaves the selfcheck checkbox
to "on"

* Setting "Backend=XRender", "Enabled=false" in settings file allows me to
enable compositing without error message, regardless of the "DisableChecks"
setting in the settings file or the dialog

SUMMARY:

It looks like as if it first does the selfcheck with the render mode from the
previous value of the ComboBox (which is OpenGL on a clean .kde), then applies
the changes from the dialog (composite mode combobox, selfcheck checkbox).

Since OpenGL fails on my system (or was very slow when it worked with earlier
KDE 4.0/4.1 versions) I cannot enable XRender without manually adding it to the
settings file.


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