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Xorg's X Window innovation - it's not ALL about the graphics (but there's quite
a lot of it)
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| Some proprietary drivers emulate overlays, but for that to work they have to
| run in kernel space anyway; so, in the case of video, 2D acceleration became
| worse with time. And currently, on recent chips, 2D acceleration is emulated
| through the card’s 3D core via its firmware. The day when even this emulation
| goes bye-bye, 2D acceleration won’t exist - period.
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http://www.freesoftwaremagazine.com/columns/xorgs_x_window_innovation_its_not_all_about_graphics
Related:
Persistent Configuration Options For X.Org Drivers
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| When it comes to proprietary drivers, AMD has almost completely eliminated
| their dependence on the xorg.conf and NVIDIA too is eliminating their need of
| this method for configuring the X server. With the fglrx Linux driver,
| ATI/AMD has developed the AMDPCSDB, or the AMD Persistent Configuration Store
| Data-Base. The AMDPCSDB, which is somewhat modeled after the Windows
| registry, is their proprietary replacement for managing all persistent
| display/graphics-related options. Values for overrode options like
| anti-aliasing and anisotropic filtering are written to this persistent
| configuration store as well as the layout and configuration of multiple
| screens. All of these AMD options are applied in real-time and will remain
| persistent upon rebooting the computer or X if it's been written to the
| AMDPCSDB.
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http://www.phoronix.com/scan.php?page=article&item=xorg_driver_persistent&num=1
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