x11 MergedFB is now working in my X300 ATI RADEON

[Chris Shenton]

Daniel Jesus Valencia Sanchez <valencid at uci.edu> writes:

> I was so frustrated that I got those hard locks in my box when trying
> to use two monitors in MergedFB, that I searched everywhere (including
> the archives of this list) and couldn't find anything to solve it.  A
> little of RTFM taught me of a few options that I could tweak, and
> *FINALLY* I made it work properly (well, cuasi-properly, for the
> performance is a little degraded).  So, for the information of anyone
> that could care (like the french guy), here it goes...
>
> The option that saved my life is:
>    Option      "NoAccel"                     "true"
> in Section "Device"

I tried this to see if it cured the blue blotches I got when I
disabled DRI to make my Radeon work without hanging the machine.

It did!  But the performance was terrible.  The minute I commented out
NoAccel the blue blotches re-appeared. 

This was on an OS and Kernel rebuilt from CVSup today:

  FreeBSD 6.1-RC #4: Tue Apr 25 07:18:17 EDT 2006

Guess it's back to the slow screen repaints and scrolling :-(
Any idea why disabling Accel causes the blotches?
Could it be the disabled backing store? It seems some graphics are not
getting painted, but sometimes refresh if I mouse or move windows over
them.

This was on 6.8.99.903; I had the same blotches on 6.9.x servers.
Samples of server logs below:

(--) PCI:*(1:0:0) ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)] rev 0, Mem @ 0xfc000000/25, 0xfe9e0000/16, I/O @ 0xdc00/8, BIOS @ 0xfea00000/17
(--) PCI: (1:0:1) ATI Technologies Inc RV370 [Radeon X300SE] rev 0,
Mem @ 0xfe9f0000/16
(II) Module bitmap: vendor="X.Org Foundation"
	compiled for 6.8.99.903, module version = 1.0.0
(==) RADEON(0): Using XAA acceleration architecture
(II) RADEON(0): Render acceleration unsupported on Radeon 9500/9700 and newer.
(II) RADEON(0): Render acceleration disabled
(II) RADEON(0): Using XFree86 Acceleration Architecture (XAA)
	Screen to screen bit blits
	Solid filled rectangles
	8x8 mono pattern filled rectangles
	Indirect CPU to Screen color expansion
	Solid Lines
	Scanline Image Writes
	Offscreen Pixmaps
	Setting up tile and stipple cache:
		32 128x128 slots
		30 256x256 slots
		13 512x512 slots
(II) RADEON(0): Acceleration enabled
(==) RADEON(0): Backing store disabled
(WW) RADEON(0): Direct rendering disabled
(II) ATI: ATI driver (version 6.5.7) for chipsets: ati, ativga
(II) R128: Driver for ATI Rage 128 chipsets: