Red Hat ENTERPRISE LINUX AS 2.1 Installation Manual page 176

176 Appendix E:Troubleshooting Your Installation of Red Hat Enterprise Linux AS
E.4.6 Your Printer Will Not Work Under X
If you are not sure how to set up your printer or are having trouble getting it to work properly, try using
the graphical printconf program. Log in as root, open a terminal window, and type printconf-
gui.
E.4.7 Is Your RAM Not Being Recognized?
Sometimes, the kernel does not recognize all of your memory (RAM). You can check this with the
following command:
cat /proc/meminfo
Find out if the displayed quantity is the same as the known amount of RAM in your system. If they
are not equal, add the following line to the /boot/grub/grub.conf or /etc/lilo.conf file,
depending on the boot loader you installed:
append="mem= xx M"
Replace xx with the amount of RAM you have in megabytes. Remember that per-image append lines
completely overwrite the global append line. It might be worth adding this to the per-image descrip-
tions, as shown in this example:
append="mem=128M"
In /boot/grub/grub.conf, the above example would look similar to the following:
#NOTICE: You have a /boot partition. This means that
#
default=0
timeout=30
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.6-2)
Once you reboot, the changes made to grub.conf will be reflected on your system.
In /etc/lilo.conf, the above example would look similar to the following:
boot=/dev/sda
all kernel paths are relative to /boot/
root (hd0,0)
kernel /vmlinuz-2.2.6-2 ro root=/dev/hda3
append="mem=128M"
map=/boot/map
install=/boot/boot.b
prompt
timeout=50
image=/boot/vmlinuz-2.2.12-20