Full screen only uses part of screen

[Bill Moseley]

I have a few old iMacs with a ATI 3D Rage Pro 215GP (they are run as
thin clients via LTSP).

When I run "full screen" games (e.g. Tux Typing, or Tux Math) only a
small part of the inner screen is used.

Any tricks to get full screen to work?

I've attached lspci out for the card and the xorg.conf that is
auto-generated.

Only significant error is:
(EE) AIGLX: Screen 0 is not DRI capable


00:12.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro 215GP (rev 5c) (prog-if 00 [VGA])
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 32 (2000ns min), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 22
	Region 0: Memory at 81000000 (32-bit, non-prefetchable) [size=16M]
	Region 1: I/O ports at 0c00 [size=256]
	Region 2: Memory at 80881000 (32-bit, non-prefetchable) [size=4K]




Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
	InputDevice	"stylus"	"SendCoreEvents"
	InputDevice	"cursor"	"SendCoreEvents"
	InputDevice	"eraser"	"SendCoreEvents"
	InputDevice	"Synaptics Touchpad"
EndSection

Section "Files"
	RgbPath      "/etc/X11/rgb"
	ModulePath   "/usr/lib/xorg/modules"
	FontPath     "/usr/share/fonts/X11/misc"
	FontPath     "/usr/share/fonts/X11/cyrillic"
	FontPath     "/usr/share/fonts/X11/100dpi/:unscaled"
	FontPath     "/usr/share/fonts/X11/75dpi/:unscaled"
	FontPath     "/usr/share/fonts/X11/Type1"
	FontPath     "/usr/share/fonts/X11/100dpi"
	FontPath     "/usr/share/fonts/X11/75dpi"
	FontPath     "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
	Load  "GLcore"
	Load  "dbe"
	Load  "dri"
	Load  "extmod"
	Load  "glx"
	Load  "record"
	Load  "xtrap"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option	"XkbRules"	"xorg"
	Option	"XkbModel"	"pc105"
	Option	"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/input/mice"
	Option	    "ZAxisMapping" "4 5 6 7"
	Option	"Emulate3Buttons"	"true"
EndSection

Section "InputDevice"
	Identifier	"Synaptics Touchpad"
	Driver	"synaptics"
	Option	"SendCoreEvents"	"true"
	Option	"Device"	"/dev/psaux"
	Option	"Protocol"	"auto-dev"
	Option	"HorizScrollDelta"	"0"
EndSection

Section "InputDevice"
	Driver	"wacom"
	Identifier	"stylus"
	Option	"Device"	"/dev/input/wacom"
	Option	"Type"		"stylus"
	Option	"ForceDevice"	"ISDV4"	# Tablet PC ONLY
EndSection

Section "InputDevice"
	Driver	"wacom"
	Identifier	"eraser"
	Option	"Device"	"/dev/input/wacom"
	Option	"Type"		"eraser"
	Option	"ForceDevice"	"ISDV4"	# Tablet PC ONLY
EndSection

Section "InputDevice"
	Driver	"wacom"
	Identifier	"cursor"
	Option	"Device"	"/dev/input/wacom"
	Option	"Type"		"cursor"
	Option	"ForceDevice"	"ISDV4"	# Tablet PC ONLY
EndSection

Section "Monitor"
VertRefresh	47-117
HorizSync	60-60
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Monitor Model"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz"
        ### [arg]: arg optional
        #Option     "probe_sparse"       	# [<bool>]
        #Option     "accel"              	# [<bool>]
        #Option     "crt_display"        	# [<bool>]
        #Option     "composite_sync"     	# [<bool>]
        #Option     "hw_cursor"          	# [<bool>]
        #Option     "force_pci_mode"     	# [<bool>]
        #Option     "dma_mode"           	# <str>
        #Option     "agp_mode"           	# <i>
        #Option     "agp_size"           	# <i>
        #Option     "local_textures"     	# [<bool>]
        #Option     "buffer_size"        	# <i>
        #Option     "mmio_cache"         	# [<bool>]
        #Option     "test_mmio_cache"    	# [<bool>]
        #Option     "panel_display"      	# [<bool>]
        #Option     "reference_clock"    	# <freq>
        #Option     "shadow_fb"          	# [<bool>]
        #Option     "sw_cursor"          	# [<bool>]
        #Option     "AccelMethod"        	# <str>
        #Option     "RenderAccel"        	# [<bool>]
	Identifier  "Card0"
	Driver      "ati"
	VendorName  "ATI Technologies Inc"
	BoardName   "3D Rage Pro 215GP"
	BusID       "PCI:0:18:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	SubSection "Display"
		Modes		 "1024x768"
		Viewport   0 0
		Depth     1
	EndSubSection
	SubSection "Display"
		Modes		 "1024x768"
		Viewport   0 0
		Depth     4
	EndSubSection
	SubSection "Display"
		Modes		 "1024x768"
		Viewport   0 0
		Depth     8
	EndSubSection
	SubSection "Display"
		Modes		 "1024x768"
		Viewport   0 0
		Depth     15
	EndSubSection
	SubSection "Display"
		Modes		 "1024x768"
		Viewport   0 0
		Depth     16
	EndSubSection
	SubSection "Display"
		Modes		 "1024x768"
		Viewport   0 0
		Depth     24
	EndSubSection
EndSection

Section "DRI"
        Mode    0666
EndSection

-- 
Bill Moseley
moseley at hank.org