I have a grub.conf (below) with pci=nomsi, also /proc/cmdline and dmesg | more do not show the pci=nomsi. How can this be? there are no strange characters after quiet and before pci=nomsi. It was edited with vi. What can I do to get this parameter in my kernel boot line. Jerry ----------------- default=0 timeout=5 splashimage=(hd0,0)/boot/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-164.11.1.el5) root (hd0,0) kernel /boot/vmlinuz-2.6.18-164.11.1.el5 ro root=LABEL=/ rhgb quiet pci=nomsi initrd /boot/initrd-2.6.18-164.11.1.el5.img cat /proc/cmdline ro root=LABEL=/ rhgb quiet dmesg | more Linux version 2.6.18-164.11.1.el5 (mockbuild at builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) #1 SMP Wed Jan 20 07:32:21 EST 2010 Command line: ro root=LABEL=/ rhgb quiet BIOS-provided physical RAM map: