Acer Aspire One and SD cards

There are two SD card readers built into some Acer Aspire One systems. The one on the left side is designed to act as more long-term storage (the card left in between netbook uses) the right side, however, is designed to be hot-swappable and supports other types of storage cards. The issue results in SD cards not being usable when the netbook booted up unless a SD card was plugged in before boot, at which point it worked as expected.

There is an Ubuntu bug report detailing the issue and potential fixes:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/271019

On my Acer Aspire One, the fix was an entry added to GRUB's /boot/grub/menu.lst file, adding "pciehp.pciehp_force=1" to the end of the kernel line. However, this change would not take effect at the next kernel update. Ubuntu's grub update script uses markers to update kernel entries - according to its comments:

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below
 
## DO NOT UNCOMMENT THEM, Just edit them to your needs

The entry needed was:

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

The first few lines begin with a double hash  (##) - these are the real comments, the entries beginning with a single hash (#) are the lines used by the update-grub script. The change to be made resulted in the following:

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash pciehp.pciehp_force=1