Linux Mint AMD freezes

[unknownpwn]

Hello!
I'm using Linux Mint 17.1 Cinnamon with an AMD Radeon HD 6950, driver version 14.6 beta 1, using oclHashcat64 version 1.37 and I'm trying to decrypt some phpass hashes but my computer freezes when doing it and I need to reset it to get it back working.

No input from keyboard or mouse works, but what's odd is that I can SSH to the computer when it's frozen. Although nothing seems to get it up and running again except for the resetting it physically. I'm fairly new to Linux/hashes so please let me know what kind of information I should provide or to try.

These are the different parameters I've tried:

Code:

oclHashcat64.bin

 ./oclHashcat64.bin -m 400 -a 0 -w 3 --username --gpu-temp-disable -r rules/InsidePro-PasswordsPro.rule ifkhashes /usr/share/wordlists/ifkultimate2.txt
    Freezes after a minute or so on clean install

 ./oclHashcat32.bin -m 400 -a 0 -w 3 --username --gpu-temp-disable -r rules/InsidePro-PasswordsPro.rule ifkhashes /usr/share/wordlists/ifkultimate2.txt
    Freezes instantly

 ./oclHashcat64.bin -m 400 -a 0 -w 3 --username --gpu-temp-disable ifkhashes /usr/share/wordlists/ifkultimate2.txt -o ifkcracked
    took 2 seconds, no freeze.

 ./oclHashcat64.bin -m 400 -a 0 -w 3 --username --gpu-temp-disable ifkhashes /media/unknownpwn/Backups/wordlists/Super-WPA -o ifkcracked
    Froze after caching the wordlist

 ./oclHashcat64.bin -m 400 -a 0 -w 2 --username --restore-disable --gpu-temp-disable ifkhashes /media/unknownpwn/Backups/wordlists/Super-WPA -o ifkcracked
    Froze after caching the wordlist

 cat /usr/share/wordlists/ifkultimate2.txt |  ./oclHashcat64.bin -m 400 ifkhashes --restore-disable --username
    Took 2 seconds, no freeze.

 cat /usr/share/wordlists/ifkultimate2.txt |  ./oclHashcat64.bin -m 400 ifkhashes --restore-disable --username -r rules/InsidePro-PasswordsPro.rule
    Freezes instantly

cat ifkultimate2.txt | ./oclHashcat64.bin -m 400 phpasshashes --force -r rules/best64.rule
    Removed drivers and installed beta drivers instead, downloaded oclHashcat again and tried with clean working directory. Took 2 seconds, no freeze

cat ifkultimate2.txt | ./oclHashcat64.bin -m 400 phpasshashes --force -r rules/InsidePro-PasswordsPro.rule
    Froze instantly

I've tried several versions of the graphic card driver, currently running the latest beta drivers from AMD ( linux-amd-catalyst-14.6-beta-v1.0-jul11 )
glxinfo

Code:

glxinfo
name of display: :0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: ATI
server glx version string: 1.4

uname -a

Code:

Linux unknown 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

fglrxinfo

Code:

display: :0  screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: AMD Radeon HD 6900 Series
OpenGL version string: 4.4.12967 Compatibility Profile Context 14.20

lshw -C display

Code:

 *-display              
      description: VGA compatible controller
      product: Cayman PRO [Radeon HD 6950]
      vendor: Advanced Micro Devices, Inc. [AMD/ATI]
      physical id: 0
      bus info: pci@0000:01:00.0
      version: 00
      width: 64 bits
      clock: 33MHz
      capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
      configuration: driver=fglrx_pci latency=0
      resources: irq:52 memory:e0000000-efffffff memory:f7e20000-f7e3ffff ioport:e000(size=256) memory:f7e00000-f7e1ffff

lspci  -v -s  $(lspci | grep VGA | cut -d" " -f 1)

Code:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cayman PRO [Radeon HD 6950] (prog-if 00 [VGA controller])
Subsystem: XFX Pine Group Inc. Device 3120
Flags: bus master, fast devsel, latency 0, IRQ 52
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f7e20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at f7e00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: fglrx_pci

I've found no logs in /var/log/ that can point me in the right direction.

If anyone can assist me I'd be grateful.
Thank you