Comment 25 for bug 690801

This is almost certainly a kernel bug of some sort. I assume if you swap back to the original keyboard it works properly?

[ 7.640314] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1e.0/0000:04:04.1/usb5/5-2/5-2:1.0/input/input2
[ 7.640417] logitech 0003:046D:C512.0001: input,hidraw0: USB HID v1.10 Keyboard [Logitech USB Receiver] on usb-0000:04:04.1-2/input0
[ 7.650650] input: Logitech USB Receiver as /devices/pci0000:00/0000:00:1e.0/0000:04:04.1/usb5/5-2/5-2:1.1/input/input3
[ 7.650747] logitech 0003:046D:C512.0002: input,hidraw1: USB HID v1.10 Mouse [Logitech USB Receiver] on usb-0000:04:04.1-2/input1

Fwiw, I notice in the dmesg a call trace got dumped, but probably not related to the keyboard issue.

[ 592.444640] ------------[ cut here ]------------
[ 592.444662] WARNING: at /build/buildd/linux-2.6.37/ubuntu/aufs/plink.c:425 au_plink_append+0x2dc/0x2f0 [aufs]()
[ 592.444664] Hardware name: Dell DXP061
[ 592.444666] unexpectedly many pseudo links, 101
[ 592.444667] Modules linked in: binfmt_misc parport_pc ppdev lp dm_crypt parport snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi arc4 snd_rawmidi snd_seq_midi_event snd_seq rt73usb crc_itu_t snd_timer rt2x00usb rt2x00lib snd_seq_device mac80211 snd psmouse soundcore cfg80211 dcdbas shpchp snd_page_alloc serio_raw squashfs aufs isofs nls_iso8859_1 nls_cp437 vfat fat dm_raid45 xor btrfs zlib_deflate libcrc32c hid_logitech ff_memless usbhid hid usb_storage uas radeon ttm drm_kms_helper drm ahci i2c_algo_bit e1000e libahci
[ 592.444705] Pid: 5837, comm: dpkg Tainted: G W 2.6.37-9-generic #22-Ubuntu
[ 592.444707] Call Trace:
[ 592.444715] [<ffffffff8106620f>] warn_slowpath_common+0x7f/0xc0
[ 592.444718] [<ffffffff81066306>] warn_slowpath_fmt+0x46/0x50
[ 592.444726] [<ffffffffa02dad4c>] au_plink_append+0x2dc/0x2f0 [aufs]
[ 592.444733] [<ffffffffa02d5e84>] au_cpup_or_link+0x144/0x270 [aufs]
[ 592.444741] [<ffffffffa02d68b8>] aufs_link+0x1c8/0x580 [aufs]
[ 592.444745] [<ffffffff8116f1e3>] ? generic_permission+0x23/0xc0
[ 592.444748] [<ffffffff8116ff1c>] vfs_link+0xfc/0x180
[ 592.444751] [<ffffffff81173e10>] sys_linkat+0x170/0x180
[ 592.444755] [<ffffffff815baafe>] ? _raw_spin_lock+0xe/0x20
[ 592.444758] [<ffffffff8116fdc1>] ? path_put+0x31/0x40
[ 592.444761] [<ffffffff8118e967>] ? do_utimes+0xf7/0x100
[ 592.444764] [<ffffffff81173e3e>] sys_link+0x1e/0x20
[ 592.444767] [<ffffffff8100c0c2>] system_call_fastpath+0x16/0x1b
[ 592.444770] ---[ end trace 9d495e25aeb5fca8 ]---