Created attachment 41615 [details] [review]
with default packages and default conf
I have an integrated ATI Rage Pro 2x on a Dell OptiPlex GX1.
I'm running ARCHLINUX
here's a part of the xorg log with default packages and default configuration
[ 23.698] (--) Depth 24 pixmap format is 32 bpp
[ 23.757] (WW) MACH64(0): DRI static buffer allocation failed -- need at least 10000 kB video memory
[ 23.791] (II) MACH64(0): Direct rendering disabled
and the second situation:
I install mach64drm from AUR and added an xorg.conf and switched to 16bpp
here's a part of xorg log:
[ 25.394] (II) MACH64(0): I2C bus "Mach64" initialized.
[ 25.455] (WW) MACH64(0): DRI static buffer allocation failed -- need at least 7593 kB video memory
[ 25.489] (II) MACH64(0): Direct rendering disabled
Created attachment 41616 [details] [review]
with mach64drm built from AUR + custom conf + depth = 16bpp
This is nothing to do with sgram. You just don't have enough video memory to enable the DRI on your board. Due to driver limitations, the driver statically allocates front, back, and depth buffers for 3D and each has to be the size of your screen. front/back/depth at 1280x800 @ 16bpp = 5.9 MB. You only have 4 MB of vram. Try 800x600, it will only require 2.8 MB for 3D.