I'm on 14.10 with:
* Lenovo T440s (00:02.0 VGA compatible controller: Intel Corporation 
Haswell-ULT Integrated Graphics Controller (rev 0b))
* 2 Dell U2413 displays with DP 1.2 enabled.
* Kernel: 3.16.0-25-generic #33hf73386v20141106b1-Ubuntu SMP
* Driver: ii  xserver-xorg-video-intel                                    
2:2.99.916+git20141112.f9f85b88-0ubuntu0sarvatt amd64        X.Org X server -- 
Intel i8xx, i9xx display driver

Both monitors shows up in unity-control-center's Display section, but when I 
attempt to enable either of them, the displays flash, and then I get "The 
selected configuration for displays could not be applied: could not set the 
configuration for CRTC 64". It looks like I get some sort of crash in the 
driver or kernel. I found this in the logs:
[   637.412] (II) intel(0): resizing framebuffer to 3840x2280
[   637.449] (II) intel(0): switch to mode 1920x1200@60.0 on DP1-1 using pipe 
1, position (1920, 0), rotation normal, reflection none

==> syslog <==
Nov 19 11:56:14 dib kernel: [  637.206389] ------------[ cut here ]------------
Nov 19 11:56:14 dib kernel: [  637.206437] WARNING: CPU: 1 PID: 3415 at 
/build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_ddi.c:850 
intel_ddi_pll_select+0x7f/0x3c0 [i915]()
Nov 19 11:56:14 dib kernel: [  637.206439] Invalid DDI encoder type 11
Nov 19 11:56:14 dib kernel: [  637.206441] Modules linked in: ctr ccm uvcvideo 
videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media 
arc4 btusb intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel 
kvm snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi iwlmvm 
snd_hda_intel mac80211 rtsx_pci_ms memstick snd_hda_controller snd_hda_codec 
snd_hwdep joydev snd_pcm serio_raw snd_seq_midi snd_seq_midi_event iwlwifi 
snd_rawmidi cfg80211 lpc_ich rfcomm snd_seq bnep snd_seq_device bluetooth 
snd_timer 6lowpan_iphc thinkpad_acpi nvram snd shpchp intel_smartconnect 
mac_hid mei_me mei soundcore parport_pc ppdev binfmt_misc lp parport dm_crypt 
rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i915 psmouse ahci 
libahci rtsx_pci i2c_algo_bit drm_kms_helper e1000e drm ptp pps_core wmi video
Nov 19 11:56:14 dib kernel: [  637.206520] CPU: 1 PID: 3415 Comm: Xorg Tainted: 
G        W     3.16.0-25-generic #33hf73386v20141106b1-Ubuntu
Nov 19 11:56:14 dib kernel: [  637.206522] Hardware name: LENOVO 
20AQ005YUS/20AQ005YUS, BIOS GJET75WW (2.25 ) 03/28/2014
Nov 19 11:56:14 dib kernel: [  637.206525]  0000000000000009 ffff8800c868baf0 
ffffffff8178015c ffff8800c868bb38
Nov 19 11:56:14 dib kernel: [  637.206529]  ffff8800c868bb28 ffffffff8106fd7d 
ffff88020ee24000 000000000000000b
Nov 19 11:56:14 dib kernel: [  637.206533]  ffff88020e810000 0000000000083d60 
ffff8800c8fae400 ffff8800c868bb88
Nov 19 11:56:14 dib kernel: [  637.206537] Call Trace:
Nov 19 11:56:14 dib kernel: [  637.206547]  [<ffffffff8178015c>] 
dump_stack+0x45/0x56
Nov 19 11:56:14 dib kernel: [  637.206554]  [<ffffffff8106fd7d>] 
warn_slowpath_common+0x7d/0xa0
Nov 19 11:56:14 dib kernel: [  637.206558]  [<ffffffff8106fdec>] 
warn_slowpath_fmt+0x4c/0x50
Nov 19 11:56:14 dib kernel: [  637.206588]  [<ffffffffc029bc4f>] 
intel_ddi_pll_select+0x7f/0x3c0 [i915]
Nov 19 11:56:14 dib kernel: [  637.206614]  [<ffffffffc0277d62>] 
haswell_crtc_mode_set+0x12/0x40 [i915]
Nov 19 11:56:14 dib kernel: [  637.206641]  [<ffffffffc0287176>] 
__intel_set_mode+0x6d6/0xab0 [i915]
Nov 19 11:56:14 dib kernel: [  637.206667]  [<ffffffffc028a456>] 
intel_set_mode+0x16/0x30 [i915]
Nov 19 11:56:14 dib kernel: [  637.206692]  [<ffffffffc028b56a>] 
intel_crtc_set_config+0xa9a/0xe30 [i915]
Nov 19 11:56:14 dib kernel: [  637.206713]  [<ffffffffc0143571>] 
drm_mode_set_config_internal+0x61/0xe0 [drm]
Nov 19 11:56:14 dib kernel: [  637.206733]  [<ffffffffc0147503>] 
drm_mode_setcrtc+0x283/0x580 [drm]
Nov 19 11:56:14 dib kernel: [  637.206747]  [<ffffffffc0137a4f>] 
drm_ioctl+0x1df/0x680 [drm]
Nov 19 11:56:14 dib kernel: [  637.206755]  [<ffffffff811f4c28>] 
do_vfs_ioctl+0x2c8/0x4a0
Nov 19 11:56:14 dib kernel: [  637.206759]  [<ffffffff811e3201>] ? 
__sb_end_write+0x31/0x60
Nov 19 11:56:14 dib kernel: [  637.206765]  [<ffffffff811e0d72>] ? 
vfs_write+0x1b2/0x1f0
Nov 19 11:56:14 dib kernel: [  637.206769]  [<ffffffff811f4e81>] 
SyS_ioctl+0x81/0xa0
Nov 19 11:56:14 dib kernel: [  637.206775]  [<ffffffff817881ad>] 
system_call_fastpath+0x1a/0x1f
Nov 19 11:56:14 dib kernel: [  637.206777] ---[ end trace 4fa62fb37568112e ]---
Nov 19 11:56:14 dib kernel: [  637.208375] ------------[ cut here ]------------
Nov 19 11:56:14 dib kernel: [  637.208414] WARNING: CPU: 0 PID: 3415 at 
/build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_ddi.c:850 
intel_ddi_pll_select+0x7f/0x3c0 [i915]()
Nov 19 11:56:14 dib kernel: [  637.208417] Invalid DDI encoder type 11

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https://bugs.launchpad.net/bugs/1104230

Title:
  DisplayPort 1.2 MST support is missing in the Intel driver

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