------------[ cut here ]------------
WARNING: at /build/buildd/linux-2.6.35/lib/kref.c:34 kref_get+0x21/0x30()
Hardware name: Aspire 4710                    
Modules linked in: aes_i586 aes_generic ipt_MASQUERADE xt_DSCP binfmt_misc parport_pc ppdev iptable_nat iptable_mangle joydev dm_crypt ipt_REJECT ipt_LOG xt_limit xt_tcpudp ipt_addrtype xt_state snd_hda_codec_realtek ip6table_filter ip6_tables snd_hda_intel nf_nat_irc nf_conntrack_irc snd_hda_codec nf_nat_ftp nf_nat snd_hwdep nf_conntrack_ipv4 nf_defrag_ipv4 snd_pcm nf_conntrack_ftp nf_conntrack iptable_filter snd_seq_midi ip_tables snd_rawmidi x_tables snd_seq_midi_event snd_seq lib80211_crypt_tkip snd_timer acer_wmi snd_seq_device uvcvideo wl(P) videodev v4l1_compat psmouse snd serio_raw lib80211 soundcore snd_page_alloc lp parport usbhid hid i915 drm_kms_helper drm firewire_ohci intel_agp i2c_algo_bit tg3 sdhci_pci sdhci firewire_core led_class crc_itu_t video agpgart output
Pid: 1085, comm: Xorg Tainted: P            2.6.35-19-generic #28-Ubuntu
Call Trace:
 [<c014a812>] warn_slowpath_common+0x72/0xa0
 [<c0352921>] ? kref_get+0x21/0x30
 [<c0352921>] ? kref_get+0x21/0x30
 [<c014a862>] warn_slowpath_null+0x22/0x30
 [<c0352921>] kref_get+0x21/0x30
 [<f808f2d3>] drm_gem_handle_create+0x83/0xa0 [drm]
 [<c05c6c39>] ? mutex_lock+0x19/0x40
 [<f837d755>] intel_user_framebuffer_create_handle+0x15/0x20 [i915]
 [<f80988f9>] drm_mode_getfb+0x69/0xa0 [drm]
 [<c01c64ad>] ? event_format_read+0xcd/0x280
 [<f808d98d>] drm_ioctl+0x1ad/0x430 [drm]
 [<c01c64ad>] ? event_format_read+0xcd/0x280
 [<f8098890>] ? drm_mode_getfb+0x0/0xa0 [drm]
 [<c032e036>] ? apparmor_file_permission+0x16/0x20
 [<c0302504>] ? security_file_permission+0x14/0x20
 [<c0218092>] ? rw_verify_area+0x62/0xd0
 [<c01c64ad>] ? event_format_read+0xcd/0x280
 [<c02260e2>] vfs_ioctl+0x32/0xb0
 [<f808d7e0>] ? drm_ioctl+0x0/0x430 [drm]
 [<c0226979>] do_vfs_ioctl+0x79/0x2d0
 [<c0217e70>] ? do_sync_write+0x0/0xe0
 [<c0226c37>] sys_ioctl+0x67/0x80
 [<c01c64ad>] ? event_format_read+0xcd/0x280
 [<c05c8364>] syscall_call+0x7/0xb
 [<c01c64ad>] ? event_format_read+0xcd/0x280
 [<c01c64ad>] ? event_format_read+0xcd/0x280
---[ end trace 53cb8f59d4e80feb ]---