xorg-x11-drv-ati-6.6.3-1.fc6

After upgrading to FC6, dpms does not appear to work on my laptop.  The laptop's
display never gets turned off, xscreensaver only turns the display screen to
black, but the backlight remains on.

I believe that I have xscreensaver configured correctly.  ~/.xscreensaver reads:

dpmsEnabled:    True
dpmsStandby:    0:05:00
dpmsSuspend:    0:06:00
dpmsOff:        0:07:00

This issue appears to be particular to this specific ATI chipset.  A different
machine with a different ATI chipset gets its display turned off correctly, in FC6.

Xorg.0.log attached.

lspci -n reports:

01:00.0 0300: 1002:4c66 (rev 01)

lspci -v -v reports:

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon R250 [Mobility
FireGL 9000] (rev 01) (prog-if 00 [VGA])
	Subsystem: Uniwill Computer Corp Unknown device 2301
	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: 64 (2000ns min), Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 185
	Region 0: Memory at d0000000 (32-bit, prefetchable) [size=128M]
	Region 1: I/O ports at b000 [size=256]
	Region 2: Memory at ffcf0000 (32-bit, non-prefetchable) [size=64K]
	Expansion ROM at ffcc0000 [disabled] [size=128K]
	Capabilities: [58] AGP version 2.0
		Status: RQ=48 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3-
Rate=x1,x2,x4
		Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x1
	Capabilities: [50] Power Management version 2
		Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
		Status: D0 PME-Enable- DSel=0 DScale=0 PME-