Suspend to memory: display problem after resume w/ i855

[Manuel M T Chakravarty]

I am having problems with suspend-to-memory with a centrino laptop based
on the i855GME chipset (which is also used for the graphics adapter). 
Suspend to memory using 

  echo mem >/sys/power/state

works fine and the machine also resumes after pressing the power button
briefly.

The problem is that the display stays dark after resuming.  I am sure
that it is only the display, as CTRL-ALT-Delete still works properly
and, when typing blind, I can still issue shell commands (such as
echo'ing a string to a file).  I tested this in single-user mode (init
S), so the issue cannot be with X or other subsystems.

Has anybody else seen this?  Is there a workaround?  I couldn't find
this in Bugzilla, but maybe I overlooked something.

Cheers,
Manuel

-=- lspci output:

00:00.0 Host bridge: Intel Corp. 82852/855GM Host Bridge (rev 02)
00:00.1 System peripheral: Intel Corp. 855GM/GME GMCH Memory I/O Control
Registers (rev 02)
00:00.3 System peripheral: Intel Corp. 855GM/GME GMCH Configuration
Process Registers (rev 02)
00:02.0 VGA compatible controller: Intel Corp. 82852/855GM Integrated
Graphics Device (rev 02)
00:02.1 Display controller: Intel Corp. 82852/855GM Integrated Graphics
Device (rev 02)
00:1d.0 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #1 (rev 03)
00:1d.1 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #2 (rev 03)
00:1d.2 USB Controller: Intel Corp. 82801DB (ICH4) USB UHCI #3 (rev 03)
00:1d.7 USB Controller: Intel Corp. 82801DB (ICH4) USB2 EHCI Controller
(rev 03)
00:1e.0 PCI bridge: Intel Corp. 82801BAM/CAM PCI Bridge (rev 83)
00:1f.0 ISA bridge: Intel Corp. 82801DBM LPC Interface Controller (rev
03)
00:1f.1 IDE interface: Intel Corp. 82801DBM (ICH4) Ultra ATA Storage
Controller (rev 03)
00:1f.3 SMBus: Intel Corp. 82801DB/DBM (ICH4) SMBus Controller (rev 03)
00:1f.5 Multimedia audio controller: Intel Corp. 82801DB (ICH4) AC'97
Audio Controller (rev 03)
00:1f.6 Modem: Intel Corp. 82801DB (ICH4) AC'97 Modem Controller (rev
03)
01:0a.0 CardBus bridge: O2 Micro, Inc. OZ6933 Cardbus Controller (rev
20)
01:0a.1 CardBus bridge: O2 Micro, Inc. OZ6933 Cardbus Controller (rev
20)
01:0c.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5788
Gigabit Ethernet (rev 03)
01:0d.0 Network controller: Intel Corp. PRO/Wireless LAN 2100 3B Mini
PCI Adapter (rev 04)
01:0e.0 FireWire (IEEE 1394): Texas Instruments TSB43AB21
IEEE-1394a-2000 Controller (PHY/Link)