Public bug reported:

After installing fglrx or fglrx-updates Driver, rebooting (everytime
since) loading spashscreen is visable, with the dialog for decryption
passphrase; however entering passphrase followed by return/enter key has
no effect.

My current workaround is to press reset key, then on next loading screen
select the current linux kernal with recovery mode option, followed by
resume boot. This brings up the decryption passphrase dialog in
terminal, and Ubuntu 14.10 loads completely thereafter.

System Specs
Motherboard: ASUS SABERTOOTH 990FX/GEN3 R2.0 with current BIOS
CPU: AMD FX-8150 @ ~4.1Ghz
RAM: 32GB (4 x 8GB) Corsair maybe G-Skill (it's been a while since installing 
it) DDR3 2133 Dimms @ ~2133
Graphics Card:  PowerColor AX7850 2GBD5-DH (AMD Radeon HD 7850)
Wifi: AUSU PCE-AC68
Power Supply: Corsair RM 750 750 watt
Several HDD's
Current HDD with Ubuntu 14.10 installed: Toshiba USB 3.0, Model Number: 
V63600-C 1TB

I'm not sure if this is purley a Driver issue or a Ubuntu issue. 
Info from AMD CCC Information page reports 
Driver Packaging Version 14.201.1006.1002-140902a-175601C-ATI
2D Driver 14.20.7
CCC Version 2.21
RandR Version 1.3
OpenGL Version 4.4.12968

Boot problem is with linux 3.16.0-29 and untested on linux 3.16.0-23.
Also untested on Ubuntu 14.04.

Thank you.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1415306

Title:
  Ubuntu 14.10 & Radeon HD 7850, fglrx/fglrx-updates Driver fixes blank
  screen on boot, but can no longer enter decryption passphrase

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