$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ fdisk -l
Disk /dev/sda: 100.0 GB, 100030242816 bytes
255 heads, 63 sectors/track, 12161 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        2432    19535008+   c  W95 FAT32 (LBA)
/dev/sda2            2433        2675     1951897+  82  Linux swap / Solaris
/dev/sda3            2676       12161    76196295   83  Linux

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ free
             total       used       free     shared    buffers     cached
Mem:       2074508     223948    1850560          0      12168     118144
-/+ buffers/cache:      93636    1980872
Swap:      1951888          0    1951888

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ patched swsusp_swap_check() function:
static int swsusp_swap_check(void) /* This is called before saving image */
{
	int i;

	spin_lock(&swap_lock);
	for (i = 0; i < MAX_SWAPFILES; i++) {
  printk("swsusp_swap_check(): test%d.1: SWP_WRITE_OK=%d\n", i, !!(swap_info[i].flags & SWP_WRITEOK));
		if (!(swap_info[i].flags & SWP_WRITEOK))
			continue;
  printk("swsusp_swap_check(): test%d.2: swsup_resume_device=%d\n", i, swsusp_resume_device);
		if (!swsusp_resume_device) {
			spin_unlock(&swap_lock);
			root_swap = i;
			return 0;
		}
  printk("swsusp_swap_check(): test%d.3: is_resume_device=%d\n", i, is_resume_device(swap_info + i));
		if (!swsusp_resume_device || is_resume_device(swap_info + i)) {
			spin_unlock(&swap_lock);
			root_swap = i;
			return 0;
		}
	}
	spin_unlock(&swap_lock);
	return -ENODEV;
}

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
$ extract from /var/log/messages, after failed hibernate:

Mar 16 23:49:56 localhost kernel: ata2: dev 0 configured for UDMA/33
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test0.1: SWP_WRITE_OK=1
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test0.2: swsup_resume_device=8388614
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test0.3: is_resume_device=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test1.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test2.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test3.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test4.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test5.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test6.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test7.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test8.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test9.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test10.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test11.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test12.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test13.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test14.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test15.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test16.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test17.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test18.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test19.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test20.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test21.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test22.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test23.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test24.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test25.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test26.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test27.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test28.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test29.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test30.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp_swap_check(): test31.1: SWP_WRITE_OK=0
Mar 16 23:49:56 localhost kernel: swsusp: Cannot find swap device, try swapon -a.
Mar 16 23:49:56 localhost kernel: Restarting tasks... done