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Hi,
I have just compiled 2.6.30 kernel and there should be some change with 2d acceleration performance because of dri modules in new kernel. But I have just turned on desktop effects in KDE with XRender engine, but the speed is not as I expected. It is still quite choppy. I own radeon 4850.
Here is my xorg.conf:
# **********************************************************************
# Module section -- this section is used to specify
# which dynamically loadable modules to load.
# **********************************************************************
Section "Module"
Load "glx"
Load "dri"
Load "drm"
EndSection
# **********************************************************************
# Files section. This allows default font and rgb paths to be set
# **********************************************************************
Section "Files"
FontPath "/usr/share/fonts/misc"
FontPath "/usr/share/fonts/TTF"
FontPath "/usr/share/fonts/Type1"
EndSection
# **********************************************************************
# Server flags section.
# **********************************************************************
Section "ServerFlags"
EndSection
# **********************************************************************
# Monitor section
# **********************************************************************
Section "Monitor"
Identifier "Gateway HD2201"
EndSection
# **********************************************************************
# Graphics device section
# **********************************************************************
Section "Device"
Identifier "Radeon HD4850"
Driver "radeon"
Option "DRI" "true"
Option "AccelMethod" "EXA"
EndSection
# **********************************************************************
# Screen sections
# **********************************************************************
Section "Screen"
Identifier "Default"
Device "Radeon HD4850"
Monitor "Gateway HD2201"
DefaultDepth 24
Subsection "Display"
Depth 8
Modes "1680x1050"
ViewPort 0 0
EndSubsection
Subsection "Display"
Depth 16
Modes "1680x1050"
ViewPort 0 0
EndSubsection
Subsection "Display"
Depth 24
Modes "1680x1050"
ViewPort 0 0
EndSubsection
EndSection
# **********************************************************************
# ServerLayout sections.
# **********************************************************************
Section "ServerLayout"
Identifier "Simple Layout"
Screen "Default"
EndSection
Should I change something?
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Yes with kernel 2.6.30, Latest ati cards have 2d acceleration (exa, xrender), but this mainly helps for playing videos and using simple exa compositing managers (xcompmgr, metacity compositing manager, or xfce compositing manager).
KDE Compositing is designed and works best with OpenGL, the Xrender option is there as a fallback mode, whatever your card/drivers, xrender will always be choppy there.
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maybe you have to wait the new version of mesa and xf86-video-ati and libdrm etc.
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Since there are so many ATI improvement news these days, I've got confused with its real status. How does the new 2.6.30 kernel support newer R6xx/R7xx chips now? And doesn't it needs correspond drivers to fulfill its goals?
Archlinux x86_64 on Thinkpad T400
Intel X4500MHD / ATI HD3470 Graphics, 2G RAM, 160G HD
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R600-R700 chips will receive 3D ( OpenGL) support with Mesa 7.6 and Linux kernel 2.6.31, but they won't have KMS/DRI2 support.
Wait until then and use catalyst.
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