Also confirms this problem (at least the exact same message in the syslog).
Machine: HP 8730w Mobile Workstation.
Ubuntu 10.04 (updated today) / x86_64
CPU: Intel(R) Core(TM)2 Quad  CPU   Q9000  @ 2.00GHz
RAM: 8GB DDR2
GPU: NVIDIA GPU Quadro FX 2700M (G94GL) at PCI:1:0:0 (GPU-0)

Please let me know whether you anything more than the below to help narrowing down the problem.

Steps to duplicate:
1. Start
2. Standby (sleep button or GUI)
3. Resume (power button) => never wakes up completely, following error message looping in the syslog:

Mar 15 20:37:26 kerdelan acpid: client connected from 2351[0:0]
Mar 15 20:37:26 kerdelan acpid: 1 client rule loaded
Mar 15 20:37:26 kerdelan kernel: [  200.952265] ACPI Warning for \_SB_.PCI0.PEGP.DGFX.MXMI: Excess arguments - needs 1, found 2 (20090903/nspredef-303)
Mar 15 20:37:26 kerdelan kernel: [  200.952320] ACPI Warning for \_SB_.PCI0.PEGP.DGFX.MXMS: Excess arguments - needs 1, found 2 (20090903/nspredef-303)
Mar 15 20:37:30 kerdelan kernel: [  205.157883] NVRM: RmInitAdapter failed! (0x26:0x38:1076)
Mar 15 20:37:30 kerdelan kernel: [  205.157890] NVRM: rm_init_adapter(0) failed
Mar 15 20:37:30 kerdelan gdm-simple-slave[2353]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
Mar 15 20:37:30 kerdelan acpid: client 2351[0:0] has disconnected

In case that matter, the NVRM initialization line:

Feb 26 12:20:09 kerdelan kernel: [  199.814862] NVRM: loading NVIDIA UNIX x86_64 Kernel Module  195.36.03  Mon Feb  1 18:33:51 PST 2010

And I also have the following entry that looks suspicious:

Mar 15 19:04:08 kerdelan kernel: [ 2122.928262] NVRM: Xid (0001:00): 54, CMDre 00000000 00000080 00000000 00000005 00000005
Mar 15 19:04:11 kerdelan kernel: [ 2125.957553] NVRM: Xid (0001:00): 54, CMDre 00000000 00000080 00000000 00000005 00000005
Mar 15 19:04:11 kerdelan kernel: [ 2125.957645] NVRM: Xid (0001:00): 54, CMDre 00000000 00000080 00000000 00000005 00000005
Mar 15 19:04:11 kerdelan kernel: [ 2125.957733] NVRM: Xid (0001:00): 54, CMDre 00000000 00000080 00000000 00000005 00000005
Mar 15 19:04:14 kerdelan kernel: [ 2129.078431] NVRM: Xid (0001:00): 54, CMDre 00000000 00000080 00000000 00000005 00000005
Mar 15 19:04:14 kerdelan kernel: [ 2129.078586] NVRM: Xid (0001:00): 54, CMDre 00000000 00000080 00000000 00000005 00000005
Mar 15 19:04:14 kerdelan gdm-session-worker[3451]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
Mar 15 19:04:14 kerdelan rtkit-daemon[1404]: Recovering from system lockup, not allowing further RT threads.
Mar 15 19:04:14 kerdelan rtkit-daemon[1404]: last message repeated 10 times

Xorg.log startup:

(**) Mar 15 20:38:28 NVIDIA(0): Enabling RENDER acceleration
(II) Mar 15 20:38:28 NVIDIA(0): Support for GLX with the Damage and Composite X extensions is
(II) Mar 15 20:38:28 NVIDIA(0):     enabled.
(II) Mar 15 20:38:30 NVIDIA(0): NVIDIA GPU Quadro FX 2700M (G94GL) at PCI:1:0:0 (GPU-0)
(--) Mar 15 20:38:30 NVIDIA(0): Memory: 524288 kBytes
(--) Mar 15 20:38:30 NVIDIA(0): VideoBIOS: 62.94.42.00.05
(II) Mar 15 20:38:30 NVIDIA(0): Detected PCI Express Link width: 16X
(--) Mar 15 20:38:30 NVIDIA(0): Interlaced video modes are supported on this GPU
(--) Mar 15 20:38:30 NVIDIA(0): Connected display device(s) on Quadro FX 2700M at PCI:1:0:0:
(--) Mar 15 20:38:30 NVIDIA(0):     LGD LP171WU5-TLB1 (DFP-0)
(--) Mar 15 20:38:30 NVIDIA(0): LGD LP171WU5-TLB1 (DFP-0): 330.0 MHz maximum pixel clock
(--) Mar 15 20:38:30 NVIDIA(0): LGD LP171WU5-TLB1 (DFP-0): Internal Dual Link LVDS
(II) Mar 15 20:38:31 NVIDIA(0): Assigned Display Device: DFP-0
(==) Mar 15 20:38:31 NVIDIA(0): 
(==) Mar 15 20:38:31 NVIDIA(0): No modes were requested; the default mode "nvidia-auto-select"
(==) Mar 15 20:38:31 NVIDIA(0):     will be used as the requested mode.
(==) Mar 15 20:38:31 NVIDIA(0): 
(II) Mar 15 20:38:31 NVIDIA(0): Validated modes:
(II) Mar 15 20:38:31 NVIDIA(0):     "nvidia-auto-select"
(II) Mar 15 20:38:31 NVIDIA(0): Virtual screen size determined to be 1920 x 1200
(--) Mar 15 20:38:32 NVIDIA(0): DPI set to (131, 132); computed from "UseEdidDpi" X config
(--) Mar 15 20:38:32 NVIDIA(0):     option
(WW) Mar 15 20:38:32 NVIDIA(0): UBB is incompatible with the Composite extension.  Disabling
(WW) Mar 15 20:38:32 NVIDIA(0):     UBB.
(==) Mar 15 20:38:32 NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
(--) Depth 24 pixmap format is 32 bpp
(II) Mar 15 20:38:32 NVIDIA: Using 768.00 MB of virtual memory for indirect framebuffer
(II) Mar 15 20:38:32 NVIDIA:     access.
(II) Mar 15 20:38:32 NVIDIA(0): Initialized GPU GART.
(II) Mar 15 20:38:32 NVIDIA(0): ACPI display change hotkey events enabled: the X server is new
(II) Mar 15 20:38:32 NVIDIA(0):     enough to receive ACPI hotkey events.
(II) Mar 15 20:38:32 NVIDIA(0): ACPI brightness change hotkey events enabled.