LG R510 - Suspend-to-RAM problem

Question

Hi, I'm having trouble using the suspend-to-ram feature on my LG R510 laptop. I tried suspending the machine using the suspend feature integrated in KDE-4.2 as well as using the command-line tools s2ram and pm-suspend. The machine behaves exactly the same in all cases:
The system (apparently) suspends without errors. It also correctly restores to it's former state upon wakeup. Even the X-Server starts and seems to work fine.
However, the hard-drive can no longer be accessed after wakeup, leaving you with a "dead" system.
If you try running a command from a shell it will trigger either "command not found" or "input/output error" messages. For that reason I'm unable to gather any diagnostic information from the continued system. Since the hard-drive cannot be accessed, no logs get written after wakeup either.
The hard-drive does spin up when the system wakes up (I can clearly hear it). There is probably some problem with the hard-drive controller. However, I wasn't able to find any specific information about Intel ICH9 chipsets and suspend-to-RAM yet.
I will post some details about the system. Please feel free to ask for additional information.
$ uname -a
Linux klappkeks 2.6.28-ARCH #1 SMP PREEMPT Sun Mar 8 10:55:58 CET 2009 x86_64 Intel(R) Core(TM)2 Duo CPU P8400 @ 2.26GHz GenuineIntel GNU/Linux
# s2ram -i
This machine can be identified by:
sys_vendor = "LG Electronics"
sys_product = "R510"
sys_version = "03"
bios_version = "QL8L3B92"
# lspci
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:01.0 PCI bridge: Intel Corporation Mobile 4 Series Chipset PCI Express Graphics Port (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9 Family) Thermal Subsystem (rev 03)
01:00.0 VGA compatible controller: nVidia Corporation GeForce 9600M GS (rev a1)
02:00.0 Network controller: Intel Corporation Wireless WiFi Link 5100
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)

Answer 1

It seems this is a BIOS bug of the LG R510. There is a workaround: You have to set your hard drive to IDE mode.
To do this, open the BIOS setup utility by pressing F2 during startup. Look for the "HDC configure as" option and switch it from AHCI to IDE.
Note that this might reduce disk performance. So far, I haven't noticed any difference after switching to IDE. Suspend-to-RAM works like a charm now.
By the way, a similar problem occurs on HP notebooks where it can be fixed through a BIOS update. Unfortunately there is no update available for the LG R510 yet.