I've been wanting to enable the invert effect; it's very useful to read large text...

Well, Whenever I try to enable it, kde only notifies me saying that it could not be enabled.

I'm using arch with kde 4.3. Before, I was using kubuntu 9.04 and neither there I could enable the effect.

I've used compiz invert effect in this pc with gnome. But I want to use kde and well, Invert is really useful.

Hey!!

Am I the only one with the issue??

Bump...

Which driver are you using? Can you enable other Kwin-effects?

FWIW, it works for me using KDE 4.3RC3 (AKA 4.2.98) and the nvidia-driver (currently 190.18 but worked using the 185.x series as well).

using intel driver.
Yes, Im using other effects:

login, logout, minimize application, shadow, taskbar thumbnails, traslucency, dialog parent, dim screen for administrator mode, slide back, cover switch, desktop cube animation, present windows

I wonder if it can be related to https://bugs.kde.org/show_bug.cgi?id=200878

The invert effect requires fragment shaders to work. Please copy/paste the output of the following:

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glxinfo | grep -iE '(shad)|(string)'


If you cannot see GL_ARB_fragment_shader and GL_ARB_shading_language_100 then your system doesn't support the required functionality.

I got the same problem

I've never been able to enable the invert effect with my ATI-card (radeon 4850 HD):

glxinfo | grep -iE '(GL_ARB_fragment_shader)|(GL_ARB_shading_language_100)|(string)|shad'
server glx vendor string: ATI
server glx version string: 1.4
client glx vendor string: ATI
client glx version string: 1.4
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: ATI Radeon HD 4800 Series
OpenGL version string: 2.1.8870
OpenGL shading language version string: 1.40
GL_AMDX_vertex_shader_tessellator, GL_AMD_draw_buffers_blend,
GL_AMD_vertex_shader_tessellator, GL_ARB_color_buffer_float,
GL_ARB_fragment_program_shadow, GL_ARB_fragment_shader,
GL_ARB_geometry_shader4, GL_ARB_half_float_pixel,
GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_shader_objects,
GL_ARB_shader_texture_lod, GL_ARB_shading_language_100, GL_ARB_shadow,
GL_ARB_shadow_ambient, GL_ARB_texture_border_clamp,
GL_ARB_vertex_buffer_object, GL_ARB_vertex_program, GL_ARB_vertex_shader,
GL_ATI_fragment_shader, GL_ATI_meminfo, GL_ATI_separate_stencil,
GL_EXT_geometry_shader4, GL_EXT_gpu_program_parameters,
GL_EXT_gpu_shader4, GL_EXT_multi_draw_arrays, GL_EXT_packed_depth_stencil,
GL_EXT_shadow_funcs, GL_EXT_stencil_wrap, GL_EXT_subtexture,

and I believe I'm not the only one suffering from this "bug"

when I still had my nvidia-card (7600 GT) it worked fine but now I can't get it to work - it seems to be the only effect it can't enable: "the following effects could not be activated" Invert

any ideas how to get it running ?

I mean - is it supposed to work at all with the fglrx driver ?

many thanks in advance

your help is highly appreciated

Does running KWin in forced direct rendering work?

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KWIN_DIRECT_GL=1 kwin --replace &


I don't think the variable affects fglrx but you never know...

thanks for your quick answer !

the problem is if enter this command the whole screen "freezes"

this means it's NOT causing a hardlock but I can't enter anything or interact with the screen anymore

I can still change to the VT and kill kwin and relaunch it from there though

fglrx still looks old compared to nvidia drivers *sigh*


"Enable direct rendering" is enabled in the section "Desktop Effects" (System Settings)

kde-version is 4.3.00

installation via kde-4.3.9999 ebuilds from kde-testing overlay

do you have any other suggestions to force it to enable the invert effect or direct rendering ?

Invert turns my screen or application black instead of inverting the colors. Is there a fix for this? I'm using the 173 NVIDIA driver. Shadow and transparency are working well.

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$ glxinfo | grep "direct"

direct rendering: Yes

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$ glxinfo | grep -iE '(shad)|(string)'

server glx vendor string: NVIDIA Corporation
server glx version string: 1.4
client glx vendor string: NVIDIA Corporation
client glx version string: 1.4
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce FX 5200/AGP/SSE2
OpenGL version string: 2.1.2 NVIDIA 173.14.25
OpenGL shading language version string: 1.20 NVIDIA via Cg compiler
GL_ARB_fragment_program_shadow, GL_ARB_fragment_shader,
GL_ARB_point_parameters, GL_ARB_point_sprite, GL_ARB_shadow,
GL_ARB_shader_objects, GL_ARB_shading_language_100,
GL_ARB_vertex_program, GL_ARB_vertex_shader, GL_ARB_window_pos,
GL_EXT_blend_subtract, GL_EXT_compiled_vertex_array, GL_EXT_Cg_shader,
GL_EXT_separate_specular_color, GL_EXT_shadow_funcs,
GL_NV_texture_shader, GL_NV_texture_shader2, GL_NV_texture_shader3,
GL_SGIS_texture_lod, GL_SGIX_depth_texture, GL_SGIX_shadow,

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$ KWIN_DIRECT_GL=1 kwin --replace &

kwin(9613) KWin::InvertEffect::drawWindow: NPOT textures not supported, wasting some memory
kwin(9613) KWin::SceneOpenGL::Window::paintDecoration: NPOT textures not supported, wasting some memory

This last command also slowed down my mouse pointer, so I restarted kdm.

Actually, I removed my nvidia and used onboard intel gpu, for a while, intel i915 does not support invert (as kwin was not allowing it). Before using intel, nvidia was working very fine with invert and other effects. Now after replacing 'nvidia' and installing nvidia drivers and all... all other effects work except 'invert' which is the one i like the most.

The Invert effect should be supported using XRender, so that all people could benefit 'text reading' for 'long hours'.

thanks.

here's kwin output from shell (konsole)
--------------
[rizvan@chakra-desktop ~]$ KWIN_DIRECT_GL=1 kwin --replace &
[1] 3005
[rizvan@chakra-desktop ~]$ kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: GL vendor is "NVIDIA Corporation"
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: GL renderer is "GeForce 8400 GS/PCI/SSE2"
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: GL version is "3.3.0 NVIDIA 256.53"
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: Detected driver "nvidia" , version "256.53"
kwin(3005) KWin::EffectsHandlerImpl::loadEffect: EffectsHandler::loadEffect : Effect "kwin4_effect_invert" is not supported
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: GL vendor is "NVIDIA Corporation"
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: GL renderer is "GeForce 8400 GS/PCI/SSE2"
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: GL version is "3.3.0 NVIDIA 256.53"
kwin(3005) KWin::CompositingPrefs::detectDriverAndVersion: Detected driver "nvidia" , version "256.53"
kwin(3005) KWin::EffectsHandlerImpl::loadEffect: EffectsHandler::loadEffect : Effect "kwin4_effect_invert" is not supported

try xcalib to get invert without kwin compositing and without opengl on any display card

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xcalib -i -a

See :
http://forum.kde.org/viewtopic.php?f=111&t=92432

http://xcalib.sourceforge.net/

Hope it helps. Thanks.