lockups with radeon 8500

[Paul Rudin]

Most opengl programs will run for a minute or two, then my whole
desktop freezes up. The system is still up - I can ssh to it, but the
console is completely unresponsive. Any tips for diagnosing and
(hopefully) fixing the problem please? Here's my xorg.conf:


# /etc/X11/xorg.conf (xorg X Window System server configuration file)
#


Section "Module"
	Load	"bitmap"
	Load	"ddc"
	Load	"dri"
	Load	"extmod"
	Load	"freetype"
	Load	"glx"
	Load	"int10"
	Load	"type1"
	Load	"vbe"
	Load	"dbe"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc105"
	Option		"XkbLayout"	"gb"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
	Option		"ZAxisMapping"		"4 5"
EndSection

Section "Device"
	Identifier	"MergedFB2 8500"
	Driver		"radeon"
	BusID		  "PCI:1:0:0"
	Option		"DynamicClocks"	"on"
	Option		"MergedFB"	"true"
	Option		"CRT2Position"	"RightOf"
	Option		"CRT2HSync"	"27-115"
	Option		"CRT2VRefresh"	"50-160"
	Option		"MetaModes"	"1280x1024-1600x1200"
	Option		"MergedNonRectangular"	"true"
EndSection

Section "Monitor"
	Identifier	"Generic Monitor"
	Option		"DPMS"
EndSection

Section "Monitor"
	Identifier	"Second Monitor"
	Option		"DPMS"
EndSection

Section "Screen"
	Identifier	"MergedFB2 Screen"
	Device		"MergedFB2 8500"
	Monitor		"Generic Monitor"
	DefaultDepth	24
	SubSection "Display"
		Depth		24
		Modes		"1280x1024"
		virtual         2880 1200
	EndSubSection
 EndSection


Section "ServerLayout"
	Identifier	"MergedFB2Layout"
	Screen		"MergedFB2 Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
EndSection

Section "DRI"
	Mode	0666
EndSection

Section "ServerFlags"
	Option		"DefaultServerLayout"	"MergedFB2Layout"
EndSection