I have this problem on an HP 6830s laptop. Please let me know if there is any further information I can provide, I can always reproduce the problem.

My syslog: 

Mar 12 07:19:54 lesliev-laptop kernel: [10599.964200] [fglrx] Power down the ASIC .
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964228] [fglrx] Preparing suspend fglrx in kernel.
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964233] ------------[ cut here ]------------
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964241] WARNING: at /build/buildd/linux-2.6.31/mm/page_alloc.c:1751 __alloc_pages_slowpath+0x421/0x490()
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964244] Hardware name: HP Compaq 6830s
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964246] Modules linked in: tun bridge stp bnep btusb isofs udf crc_itu_t binfmt_misc ppdev vboxnetadp vboxnetflt vboxdrv snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss arc4 snd_pcm ecb snd_seq_dummy snd_seq_oss joydev snd_seq_midi iwlagn iwlcore mac80211 snd_rawmidi snd_seq_midi_event iptable_filter ip_tables snd_seq x_tables snd_timer snd_seq_device fglrx(P) psmouse serio_raw snd soundcore cfg80211 snd_page_alloc hp_accel lis3lv02d input_polldev led_class lp parport video output sky2 intel_agp agpgart
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964292] Pid: 7622, comm: pm-hibernate Tainted: P           2.6.31-20-generic-pae #57-Ubuntu
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964295] Call Trace:
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964301]  [<c014692d>] warn_slowpath_common+0x6d/0xa0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964305]  [<c01ba3a1>] ? __alloc_pages_slowpath+0x421/0x490
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964309]  [<c01ba3a1>] ? __alloc_pages_slowpath+0x421/0x490
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964312]  [<c0146975>] warn_slowpath_null+0x15/0x20
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964321]  [<c01ba3a1>] __alloc_pages_slowpath+0x421/0x490
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964325]  [<c01b9df8>] ? get_page_from_freelist+0x1e8/0x370
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964328]  [<c01ba51f>] __alloc_pages_nodemask+0x10f/0x120
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964331]  [<c01ba577>] __get_free_pages+0x17/0x30
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964334]  [<c01e448f>] __kmalloc+0xdf/0x180
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964369]  [<f8b47a80>] KCL_MEM_SmallBufferAllocAtomic+0x10/0x20 [fglrx]
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964404]  [<f8b5904b>] firegl_save_fb+0x3b/0x1a0 [fglrx]
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964439]  [<f8b58116>] ? firegl_pm_save_framebuffer+0x246/0x2d0 [fglrx]
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964477]  [<f8b7a3d4>] ? firegl_cmmqs_recoverable_surface_info+0xc4/0xd0 [fglrx]
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964521]  [<f8b5b2c1>] ? firegl_cail_powerdown+0xd1/0x240 [fglrx]
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964528]  [<c0350cf1>] ? acpi_bus_power_manageable+0xe/0x23
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964557]  [<f8b43312>] ? fglrx_pci_suspend+0x82/0x140 [fglrx]
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964565]  [<c0330671>] ? pci_legacy_suspend+0x31/0xc0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964568]  [<c0350c0e>] ? acpi_bus_get_device+0x1b/0x30
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964570]  [<c0330dc4>] ? pci_pm_freeze+0x84/0xa0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964574]  [<c03aef61>] ? pm_op+0x101/0x170
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964576]  [<c0162bd4>] ? down+0x24/0x40
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964579]  [<c03af4e0>] ? device_suspend+0xb0/0x110
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964583]  [<c0319cd2>] ? kobject_get+0x12/0x20
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964585]  [<c03af5e2>] ? dpm_suspend+0xa2/0x110
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964588]  [<c03af66d>] ? dpm_suspend_start+0x1d/0x30
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964591]  [<c01779a7>] ? hibernation_snapshot+0x67/0xd0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964593]  [<c0177af0>] ? hibernate+0xe0/0x1d0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964596]  [<c01762f0>] ? state_store+0x0/0xb0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964599]  [<c0176398>] ? state_store+0xa8/0xb0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964601]  [<c01762f0>] ? state_store+0x0/0xb0
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964604]  [<c03199e0>] ? kobj_attr_store+0x20/0x30
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964607]  [<c023d470>] ? sysfs_write_file+0x90/0x100
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964610]  [<c01eb51a>] ? vfs_write+0x9a/0x190
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964612]  [<c023d3e0>] ? sysfs_write_file+0x0/0x100
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964616]  [<c057c2bb>] ? do_page_fault+0x19b/0x380
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964618]  [<c01ebfdd>] ? sys_write+0x3d/0x70
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964621]  [<c01032c3>] ? sysenter_do_call+0x12/0x28
Mar 12 07:19:54 lesliev-laptop kernel: [10599.964623] ---[ end trace 18b69e19b0a2863e ]---
Mar 12 07:19:54 lesliev-laptop kernel: [10600.733233] [fglrx] Suspending fglrx in kernel completed.
Mar 12 07:19:54 lesliev-laptop kernel: [10600.781179] HDA Intel 0000:00:1b.0: PCI INT A disabled
Mar 12 07:19:54 lesliev-laptop kernel: [10600.810171] HDA Intel 0000:00:1b.0: power state changed by ACPI to D3
Mar 12 07:19:54 lesliev-laptop kernel: [10600.849310] ACPI: Preparing to enter system sleep state S4
Mar 12 07:19:54 lesliev-laptop kernel: [10600.936253] PM: Saving platform NVS memory
Mar 12 07:19:54 lesliev-laptop kernel: [10601.009486] Disabling non-boot CPUs ...
Mar 12 07:19:54 lesliev-laptop kernel: [10601.112026] CPU 1 is now offline