Dear all,

I'm writing because I just installed the latest drivers for my ATI Radeon HD 5850, Catalyst 10.7, from Kubuntu 10.04 repository.

a) When I turn on the desktop effects, it works, but some opengl applications show strange behaviors like, black viewer, superposed images, etc...
Turning off these effects my application runs correctly.

b) Every time I boot the system, I'm observing that the screen after the boot logo goes to minimum luminosity, it came back after logon.(when effects are enable or disable).

c) Finally after the logon the desktop effects are every time off.

Do you know why and how to fix these issues? Thank you very much for any kind of help or commentary.

It is known that only a single application can do direct rendering at once currently. This is a limitation of X and the graphics drivers rather than the applications. I would recommend temporarily suspending effects prior to using OpenGL applications, especially full screen ones.

For effects not being automatically enabled, please check ~/.xsession-errors to see if KWin is providing any information on why it is not enabling effects. You may also wish to disable the functionality checks in System Settings > Desktop Effects.

Thank you so much for your reply.
Disabling functionality checks solves the startup problem. Thank you.

Now about gl applications: Is there some workround to disable these desktop effects only for opengl windows?
Thanks again.

lixo1 wrote:Now about gl applications: Is there some workround to disable these desktop effects only for opengl windows?
Thanks again.

Sort of. It does require you to remember to do it when necessary. I've personally only found it necessary for running full-screen games but your mileage may very.

Anyway, before you launch the offending program (or before opengl is activated in said program if it's only applicable in some instances such as the OpenGL imageviewer from within Gwenview): hit alt-shift-F12. It suspends compositing. The shortcut can be altered in Systemsettings if you find it hard to remember.

Kryten2X4B wrote:

lixo1 wrote:<snip>
Anyway, before you launch the offending program (or before opengl is activated in said program if it's only applicable in some instances such as the OpenGL imageviewer from within Gwenview): hit alt-shift-F12. It suspends compositing. The shortcut can be altered in Systemsettings if you find it hard to remember.

or use the toggle composting plasmoid http://kde-look.org/content/show.php/To ... tent=78299 it's nice and visual

Thank you guys!

The composite toggle is extremely funny!!! Thank you for all explanations.

Only to conclude the points (a) and (c). I would like to post .xsession_errors file. Maybe you can see something wrong, I don't know.

Someone have an idea why I'm getting low screen brightness (c) after the kubuntu boot splash screen? It returns to normal after the logon. I observed this problems also on ubuntu, opensuse, mandriva, fedora.

Cheers,
Louis

Code: Select all

cat .xsession-errors | grep error
XRANDR error base:  167
[/usr/bin/nepomukservicestub] "/usr/bin/nepomukservicestub(1642)" Error in thread 140380330604384 : "Parsing failed (3)": "syntax error at '"'" (line: 459, column: -1)
error: option -s not recognized
                      <level>: none, info*, error, warn, debug (*default)   
plasma-desktop(1566)/kdecore (services) KServiceFactory::findServiceByDesktopPath: "/home/louis/.kde/share/apps/RecentDocuments/xsession_errors.desktop" not found

I don't know why the screen brightness is set to it's lowest setting unfortunately.
You may be able to run a on system boot script however as root, which changes the brightness.

You may wish to start looking around /sys/devices/virtual/backlight/ as a start.

Thank you very much for all help!
Cheers,
Louis