yes, this kernel boots fine: Linux 3.18.0-031800rc1-generic
#201410192135 SMP Mon Oct 20 01:37:04 UTC 2014 x86_64 x86_64 x86_64
GNU/Linux

The backlight issue works much better now.
One thing I noticed is that when I redock the laptop, the backlight goes off. 
Increasing the backlight via the Fn+F9 key does not work immediately. It takes 
a few seconds before it accepts new controls.  This might, however, be caused 
by some scripts which react to the laptop being docked 
<https://github.com/martin-ueding/thinkpad-scripts/>. I thought I removed them, 
but maybe there are still traces.

Anyway, I received this, which may be relevant:

[  147.418106] ACPI: \_SB_.GDCK: docking
[  147.600681] [drm:drm_edid_block_valid] *ERROR* EDID checksum is invalid, 
remainder is 221
[  147.600685] Raw EDID:
[  147.600687]          00 ff ff ff ff ff ff 00 f0 9e 30 00 00 00 00 33
[  147.600688]          17 01 04 a5 34 20 78 26 4c a5 a7 55 4d a2 26 10
[  147.600689]          50 54 a1 08 00 b3 00 95 00 81 00 a9 40 81 80 d1
[  147.600690]          c0 81 c0 01 01 28 3c 80 a0 70 b0 23 40 30 20 36
[  147.600691]          00 06 44 21 00 00 1a 00 00 00 fd 00 32 4c 18 5e
[  147.600691]          11 00 0a 20 20 20 20 20 20 00 00 00 fc 00 48 50
[  147.600692]          20 5a 32 34 69 0a 20 20 20 20 20 00 00 00 ff 00
[  147.600693]          43 4e 34 33 35 31 30 42 42 32 0a 20 20 00 68 ff
[  147.646162] usb 4-1.3: new high-speed USB device number 4 using ehci-pci
[  147.738603] usb 4-1.3: New USB device found, idVendor=0424, idProduct=2514
[  147.738607] usb 4-1.3: New USB device strings: Mfr=0, Product=0, 
SerialNumber=0


Given that it works better, I'm adding the  kernel-fixed-upstream-3.18-rc1 tag

** Tags added: kernel-fixed-upstream-3.18-rc1

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1386597

Title:
  Oopses when ejecting thinkpad x230t from docking station with extern
  DP monitor

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