Comment 156 for bug 640100

I have a Samsung N220 Plus netbook and encountered the following: After a clean new install of Natty (Beta 1) suspend to ram works out of the box but unfortunately adapting backlight did not work.
Hence I installed the package samsung-backlight from the ppa of voria (for maverick, since natty packages are not yet available) which resolved this problem. As a matter of fact from there on suspend to ram did not work for me anymore and i encountered the same problems as described in this bug report.
Unloading the samsung-backlight module before suspend made suspend to ram working again. More explicitly I followed the steps proposed here http://www.voria.org/forum/viewtopic.php?f=3&t=625&hilit=N220&start=60

0) install samsung-backlight from the ppa of voria
1) modifiy in /etc/default/grub following line from
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash'
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
2) sudo update-grub; sudo update-initramfs -u
3) add the following text to the end of /etc/modprobe.d/blacklist.conf: blacklist samsung-backlight
4) edit /etc/rc.local and paste before the "exit 0" statement: modprobe samsung-backlight
5) create a file called /etc/pm/config.d/unload_modules containing: SUSPEND_MODULES="samsung-backlight"

I emphasize I did not have to append "intel_idle.max_cstate=0 " to grub to make suspend to ram working!
So everyone encountering the problems described in this bug report should check whether samsung-backlight is installed and whether unloading its module before suspend resolves the problem!