disable unredirection of fullscreen windows in advanced compositing settings and complain to your distribution to ship broken drivers. That issue was fixed about a year ago.

*** This bug has been marked as a duplicate of bug 252817 ***

> KWin::GLVertexBufferPrivate::fallbackPainting (this=0xa06e7c0, region=..., primitiveMode=4)

i'm not sure it's /that/ intel bug and a don't think he should be in that codepath either (doesn't look like an i810)

we got a couple of those ones recently and only one ended in the fallback path (for accidentally using UMS drivers)

@gael07ol
please post the output of "qdbus org.kde.kwin /KWin supportInformation"

Output of "qdbus org.kde.kwin /KWin supportInformation"

The following information should be used when requesting support on e.g. http://forum.kde.org.
It provides information about the currently running instance, which options are used,
what OpenGL driver and which effects are running.
Please post the information provided underneath this introductory text to a paste bin service
like http://paste.kde.org instead of pasting into support threads.

==========================

Options
=======
focusPolicy: 0
nextFocusPrefersMouse: false
clickRaise: true
autoRaise: false
autoRaiseInterval: 0
delayFocusInterval: 0
shadeHover: false
shadeHoverInterval: 250
tiling: false
tilingLayout: 1
tilingRaisePolicy: 0
separateScreenFocus: false
activeMouseScreen: false
placement: 4
focusPolicyIsReasonable: true
borderSnapZone: 10
windowSnapZone: 10
centerSnapZone: 0
snapOnlyWhenOverlapping: false
showDesktopIsMinimizeAll: false
rollOverDesktops: true
focusStealingPreventionLevel: 1
legacyFullscreenSupport: false
operationTitlebarDblClick: 
commandActiveTitlebar1: 0
commandActiveTitlebar2: 30
commandActiveTitlebar3: 2                                                                                                                                                      
commandInactiveTitlebar1: 4                                                                                                                                                    
commandInactiveTitlebar2: 30
commandInactiveTitlebar3: 2
commandWindow1: 7
commandWindow2: 8
commandWindow3: 8
commandWindowWheel: 31
commandAll1: 10
commandAll2: 3
commandAll3: 14
keyCmdAllModKey: 16777251
showGeometryTip: false
electricBorders: false
electricBorderDelay: 150
electricBorderCooldown: 350
electricBorderPushbackPixels: 1
electricBorderMaximize: true
electricBorderTiling: true
borderlessMaximizedWindows: false
killPingTimeout: 5000
hideUtilityWindowsForInactive: true
inactiveTabsSkipTaskbar: false
autogroupSimilarWindows: false
autogroupInForeground: true
compositingMode: 1
useCompositing: true
compositingInitialized: true
hiddenPreviews: 1
unredirectFullscreen: false
glSmoothScale: 2
glVSync: false
xrenderSmoothScale: false
maxFpsInterval: 17
refreshRate: 0
vBlankTime: 6144
glDirect: true
glStrictBinding: true
glStrictBindingFollowsDriver: true

Compositing
===========
Qt Graphics System: raster
Compositing is active
Compositing Type: OpenGL
OpenGL vendor string: Tungsten Graphics, Inc
OpenGL renderer string: Mesa DRI Intel(R) Ironlake Desktop x86/MMX/SSE2
OpenGL version string: 2.1 Mesa 8.0.3
Driver: Intel
GPU class: i965
OpenGL version: 2.1
Mesa version: 8.0.3
X server version: 1.12.2
Linux kernel version: 3.4.4
Direct rendering: yes
Requires strict binding: yes
GLSL shaders:  yes
Texture NPOT support:  yes
OpenGL 2 Shaders are used

Loaded Effects:
---------------
kwin4_effect_zoom
kwin4_effect_trackmouse
kwin4_effect_login
kwin4_effect_slidingpopups
kwin4_effect_minimizeanimation
kwin4_effect_translucency
kwin4_effect_screenshot
kwin4_effect_cube
kwin4_effect_boxswitch
kwin4_effect_slide
kwin4_effect_desktopgrid
kwin4_effect_fade
kwin4_effect_dialogparent
kwin4_effect_highlightwindow
kwin4_effect_taskbarthumbnail
kwin4_effect_presentwindows
kwin4_effect_dashboard
kwin4_effect_outline
kwin4_effect_startupfeedback

Currently Active Effects:
-------------------------
kwin4_effect_translucency



CPU info :
vendor_id : GenuineIntel
family : 6
model : 37
model name : Intel(R) Core(TM) i3 CPU 540 @ 3.07GHz

>> KWin::GLVertexBufferPrivate::fallbackPainting (this=0xa06e7c0, region=..., primitiveMode=4)
> GPU class: i965

likely bug #302169, ie. you've UMS drivers installed.

start "kwin --replace &" from konsole and watch for the same "Shaders are not supported" message then.
also attempt to start "kwin_gles --replace &" and check whether you get similar failures.

> unredirectFullscreen: false
did you change the setting as martin suggested before dumping the information or was the value like this?

Output for "kwin --replace &" :
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
OpenGL vendor string:                   Tungsten Graphics, Inc
OpenGL renderer string:                 Mesa DRI Intel(R) Ironlake Desktop x86/MMX/SSE2
OpenGL version string:                  2.1 Mesa 8.0.3
OpenGL shading language version string: 1.20
Driver:                                 Intel
GPU class:                              i965
OpenGL version:                         2.1
GLSL version:                           1.20
Mesa version:                           8.0.3
X server version:                       1.12.2
Linux kernel version:                   3.4.4
Direct rendering:                       yes
Requires strict binding:                yes
GLSL shaders:                           yes
Texture NPOT support:                   yes
Object::connect: No such signal KWin::WorkspaceWrapper::currentActivityChanged(QString)
Object::connect: No such signal KWin::WorkspaceWrapper::activitiesChanged()
Object::connect: No such signal KWin::WorkspaceWrapper::activitiesChanged()


Output for "kwin_gles --replace &":
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
libEGL warning: failed to create a pipe screen for i965
OpenGL vendor string:                   Tungsten Graphics, Inc
OpenGL renderer string:                 Mesa DRI Intel(R) Ironlake Desktop x86/MMX/SSE2
OpenGL version string:                  OpenGL ES 2.0 Mesa 8.0.3
OpenGL shading language version string: OpenGL ES GLSL ES 1.0.16
Driver:                                 Intel
GPU class:                              i965
OpenGL version:                         2.0
GLSL version:                           1.0.16
Mesa version:                           8.0.3
X server version:                       1.12.2
Linux kernel version:                   3.4.4
Direct rendering:                       yes
Requires strict binding:                no
GLSL shaders:                           yes
Texture NPOT support:                   yes
Object::connect: No such signal KWin::WorkspaceWrapper::currentActivityChanged(QString)
Object::connect: No such signal KWin::WorkspaceWrapper::activitiesChanged()
Object::connect: No such signal KWin::WorkspaceWrapper::activitiesChanged()


> unredirectFullscreen: false : this is the default value, i've not changed this.

Created attachment 74863 [details]
New crash information added by DrKonqi

kwin (4.9.2) on KDE Platform 4.9.2 using Qt 4.8.3

- What I was doing when the application crashed:

every time exiting screensaver mode kwin crashes.

-- Backtrace (Reduced):
#6  brw_update_renderbuffer_surface (brw=0x1df4a50, rb=0x1daed70, unit=0) at brw_wm_surface_state.c:1109
#7  0x00007fa135040aa0 in brw_update_renderbuffer_surfaces (brw=0x1df4a50) at brw_wm_surface_state.c:1205
#8  0x00007fa13502aae2 in brw_upload_state (brw=brw@entry=0x1df4a50) at brw_state_upload.c:498
#9  0x00007fa1350181d7 in brw_try_draw_prims (max_index=23, min_index=2314515928, ib=<optimized out>, nr_prims=<optimized out>, prim=0x7fff89f4b5c0, arrays=<optimized out>, ctx=0x1df4a50) at brw_draw.c:493
#10 brw_draw_prims (ctx=0x1df4a50, prim=0x7fff89f4b5c0, nr_prims=<optimized out>, ib=<optimized out>, index_bounds_valid=<optimized out>, min_index=0, max_index=23, tfb_vertcount=0x0) at brw_draw.c:589