Its the message inside /var/log/kmod.log
ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: kmod 9-2ubuntu3
Uname: Linux 3.7.0-030700rc6-generic i686
NonfreeKernelModules: btrfs libcrc32c zlib_deflate ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs reiserfs ext2 nfnetlink_queue nfnetlink xt_iprange xt_mark xt_NFQUEUE pci_stub vboxpci vboxnetadp vboxnetflt vboxdrv autofs4 bnep dm_crypt rfcomm bluetooth parport_pc ppdev xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_state ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack snd_hda_codec_realtek snd_hda_intel iptable_filter ip_tables snd_hda_codec binfmt_misc snd_hwdep x_tables snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd kvm_intel soundcore kvm serio_raw lpc_ich i82975x_edac edac_core mac_hid hwmon_vid coretemp lp parport nouveau hid_generic mxm_wmi wmi microcode video firewire_ohci usbhid i2c_algo_bit firewire_core ttm hid crc_itu_t drm_kms_helper drm sky2
ApportVersion: 2.6.2-0ubuntu5
Architecture: i386
Date: Wed Nov 28 07:11:54 2012
MarkForUpload: True
SourcePackage: kmod
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.depmod.d.ubuntu.conf: [deleted]
mtime.conffile..etc.modprobe.d.blacklist.conf: 2012-03-22T08:06:58
Still get that issue on RR i386 (kernel 3.8.0.19) and seems affecting an other trouble: usb mouse (logitech) badly acting with "click", grab & drop, and highlighting words block.