[kde] [Bug 357376] cannot use OpenGL or compositing for desktop effects-- insists on XRender

[m00nraker via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=357376

--- Comment #9 from m00nraker <m00nraker at gmx.net> ---
After I studied some other bug reports, here some additional informations:

Shell-Output from "kwin_x11 --replace" from a running plasma5 desktop:

QXcbConnection: XCB error: 8 (BadMatch), sequence: 1157, resource id:
113246213, major code: 42 (SetInputFocus), minor code: 0
OpenGL vendor string:                   NVIDIA Corporation
OpenGL renderer string:                 GeForce Go 7950 GTX/PCIe/SSE2
OpenGL version string:                  2.1.2 NVIDIA 304.131
OpenGL shading language version string: 1.20 NVIDIA via Cg compiler
Driver:                                 NVIDIA
Driver version:                         304.131
GPU class:                              NV40/G70
OpenGL version:                         2.1.2
GLSL version:                           1.20
X server version:                       1.17.2
Linux kernel version:                   4.1.15
Requires strict binding:                no
GLSL shaders:                           limited
Texture NPOT support:                   yes
Virtual Machine:                        no
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 1, 0, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 1, 0, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 1, 0, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 1, 0, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(1, 0, 0, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 1, 0, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 0, 1, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(1, 1, 1, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.44882, 0.14882, 0.14882,
1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.50064, 0.80064, 0.50064,
1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.05054, 0.05054, 0.35054,
1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(1, 1, 1, 1)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.3, 0, 0, 0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 0.4, 0, 0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0, 0, 0.5, 0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.3, 0.4, 0.5, 0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.134646, 0.044646,
0.044646, 0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.200256, 0.320256,
0.200256, 0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.02527, 0.02527, 0.17527,
0.6)
Pixel was QVector4D(0, 0, 0, 0) expected QVector4D(0.360172, 0.390172,
0.420172, 0.6)
kwin_core: ShaderManager self test failed
kwin_core: Failed to initialize compositing, compositing disabled
QXcbConnection: XCB error: 3 (BadWindow), sequence: 1298, resource id: 579,
major code: 3 (GetWindowAttributes), minor code: 0
QXcbConnection: XCB error: 9 (BadDrawable), sequence: 1299, resource id: 579,
major code: 14 (GetGeometry), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 1937, resource id:
123731969, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 1941, resource id:
123731970, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2275, resource id:
123731969, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2283, resource id:
31457288, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2745, resource id:
123731968, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 2749, resource id:
123731969, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 3243, resource id:
35651588, major code: 15 (QueryTree), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 3847, resource id:
35651597, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 4568, resource id:
35651597, major code: 18 (ChangeProperty), minor code: 0
QXcbConnection: XCB error: 3 (BadWindow), sequence: 4609, resource id:
123731972, major code: 15 (QueryTree), minor code: 0

glxinfo output:
https://paste.kde.org/ptbsvexvf

In Plasma-Systemsettings: Switching from OpenGL GLX to OpenGL EGL doesn't seem
to work with my NVidia.  Scale method is set to smooth. Pressing Shift+Alt+F12
doesn't have any effect. kwin_x11 --replace doesn't change anything. 

kwin_core: Failed to initialize compositing, compositing disabled

Can it be, that compositing support for my NVidia 7950 GTX (G70) has been
dropped? Or is it a bug?

Please help.

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