Latitude E5540 Dual Monitors

Hi,

I have a latitude E5540, that originally shipped with windows 7 pre-installed. 

I've installed Ubuntu 12.04 using the Dell supplied Ubuntu build, and the Dell Driver Installer to install all relevent drivers.

I've got the following graphics::

lspci | egrep -i "vga|nvidia"
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
03:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M / GT 620M/625M/630M/720M] (rev ff)

Everything seems to be working nicely with the laptop, except a dual monitor.  When I attach a monitor, either thru the VGA port on the laptop, or via a docking station, the screen, mouse, and keyboard locks up.  Via ssh I can still log in however.

Support states that the laptop may come with different hardware when Ubuntu is pre-installed, but haven't provided any details yet.

Anyone using a E5540 with Ubuntu pre-installed?  If so, is your lspci output different from mine?

Anyone using dual monitors on a E5540 with Ubuntu pre-installed?

Anyone using dual monitors on a E5540 with linux with the same or similar graphics configuration?

Thanks!

Also, here is a little bit of what kern.log shows:

Jan 27 08:10:11 wusa0455 kernel: [ 1088.067027] BUG: soft lockup - CPU#1 stuck for 23s! [Xorg:1966]
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067035] Modules linked in: snd_hda_codec_realtek(F) snd_hda_codec_hdmi(F) pci_stub(F) vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) joydev(F) vboxdrv(OF) vmnet(OF) vsock(OF) vmci(OF) vmmon(OF) btusb(OF) coretemp(F) kvm_intel(F) kvm(F) arc4(F) uvcvideo(F) videobuf2_core(F) videodev(F) videobuf2_vmalloc(F) videobuf2_memops(F) dell_wmi(F) sparse_keymap(F) dell_laptop(F) dcdbas(F) microcode(F) snd_hda_intel(F) snd_hda_codec(F) snd_hwdep(F) psmouse(F) iwlmvm(OF) mac80211(OF) serio_raw(F) snd_pcm(F) snd_seq_midi(F) lpc_ich(F) iwlwifi(OF) bnep(OF) rfcomm(OF) snd_rawmidi(F) cfg80211(OF) snd_seq_midi_event(F) bluetooth(OF) compat(OF) snd_seq(F) tpm_tis(F) snd_timer(F) snd_seq_device(F) parport_pc(F) ppdev(F) snd(F) soundcore(F) mac_hid(F) snd_page_alloc(F) mei(F) lp(F) parport(F) ext2(F) dm_crypt(F) hid_generic(F) usbhid(F) hid(F) e1000e(F) ghash_clmulni_intel(F) aesni_intel(F) ablk_helper(F) cryptd(F) lrw(F) sdhci_pci(F) sdhci(F) ahci(F) aes_x86_64(F) libahci(F) xts(F) gf128mul(F) nouve
Jan 27 08:10:11 wusa0455 kernel: au(F) ttm(F) mxm_wmi(F) wmi(F) i915(F) drm_kms_helper(F) drm(F) i2c_algo_bit(F) video(F)
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067153] CPU 1
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067160] Pid: 1966, comm: Xorg Tainted: GF          O 3.8.0-35-generic #50~precise1-Ubuntu Dell Inc. Latitude E5540/01389M
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067165] RIP: 0010:[ ]  [ ] delay_tsc+0x3a/0x80
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067179] RSP: 0018:ffff88021fc5d7e8  EFLAGS: 00000293
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067183] RAX: 000002ba0d6a29b6 RBX: ffffffffa00f2280 RCX: 000000000d6a29b6
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067186] RDX: 0000000000035330 RSI: 0000000000000286 RDI: 00000000000413d5
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067190] RBP: ffff88021fc5d808 R08: ffff88021fc5d8a8 R09: 0000000000000006
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067193] R10: ffffffffa00f2280 R11: ffff88021fc5d954 R12: ffffffffa00f2280
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067196] R13: ffff88021fc5d7d8 R14: 0000000000000001 R15: ffff88021fc5d7c8
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067200] FS:  00007ffb92c2b880(0000) GS:ffff88022ea80000(0000) knlGS:0000000000000000
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067204] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067208] CR2: 00007ff836c2fc39 CR3: 000000022180c000 CR4: 00000000001407e0
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067211] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067215] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067219] Process Xorg (pid: 1966, threadinfo ffff88021fc5c000, task ffff8802212dae80)
Jan 27 08:10:11 wusa0455 kernel: [ 1088.067222] Stack: