If I try recompiling the kernel with CONFIG_SOFTWARE_SUSPEND enabled, I get: ... LD .tmp_vmlinux1 arch/i386/power/built-in.o(.text+0x1a3): In function `do_magic': : undefined reference to `swsusp_pg_dir' make: *** [.tmp_vmlinux1] Exit 1 This was introduced a while ago - somewhere between 2.6.5-1.358 and 2.6.6-1.427 and is still there with 2.6.9-1.681_FC3. As far as I can tell this is caused by the linux-2.6.0-4g4g.patch Additional details, a patch that fixes this (both a separate patch and a fixed linux-2.6.0-4g4g.patch) are available in https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=125882 -- Aleksey Nogin Home Page: http://nogin.org/ E-Mail: nogin(a)cs.caltech.edu (office), aleksey(a)nogin.org (personal) Office: Jorgensen 70, tel: (626) 395-2907