Trying to use kwin GL ES I'm getting white taskbar panel. On bugs.freedesktop.org says that problem is in kwin's shaders which are incorrect.
Please see: https://bugs.freedesktop.org/show_bug.cgi?id=70169

kwin_gles --replace
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QCoreApplication::sendPostedEvents: Cannot send posted events for objects in another thread
QCoreApplication::sendPostedEvents: Cannot send posted events for objects in another thread
OpenGL vendor string:                   X.Org
OpenGL renderer string:                 Gallium 0.4 on AMD RV630
OpenGL version string:                  OpenGL ES 3.0 Mesa 10.3.0-devel (git-06842d4 trusty-oibaf-ppa)
OpenGL shading language version string: OpenGL ES GLSL ES 3.0
Driver:                                 R600G
GPU class:                              R600
OpenGL version:                         3.0
GLSL version:                           3.0
Mesa version:                           10.3
X server version:                       1.15.1
Linux kernel version:                   3.15
Direct rendering:                       yes
Requires strict binding:                no
GLSL shaders:                           yes
Texture NPOT support:                   yes
Virtual Machine:                        no
kwin(13817) KWin::EglOnXBackend::init: Cannot enable v-sync as max. swap interval is 0 
QCoreApplication::sendPostedEvents: Cannot send posted events for objects in another thread
QCoreApplication::sendPostedEvents: Cannot send posted events for objects in another thread
kwin(13817): Failed to compile fragment shader: 
"0:2(1): error: no precision specified this scope for type `vec4'
0:4(1): error: no precision specified this scope for type `float'
0:5(1): error: no precision specified this scope for type `float'
0:6(1): error: no precision specified this scope for type `float'
0:7(1): error: no precision specified this scope for type `float'
0:8(1): error: no precision specified this scope for type `float'
0:9(1): error: no precision specified this scope for type `float'
0:10(1): error: no precision specified this scope for type `float'
0:14(5): error: no precision specified this scope for type `vec4'

kwin(13817): Failed to link shader: 
"error: program lacks a fragment shader

Bus::open: Can not get ibus-daemon's address. 
IBusInputContext::createInputContext: no connection to ibus-daemon

Reproducible: Always