I am running Kubuntu 15.04 on my Sager NP8268. I have played with Linux in the past and am re-introducing myself to it right now. I am experiencing random freezing, most often on the KDM Login screen. I personally prefer the look and feel of KDM so I am running Kubuntu. The reason I feel the issue is with KDM is when I was running Gnome I didn't have any problems, I also ran OpenSuse recently with KDE Desktop and I had similar freezing problems.

Are there any hardware incompatibilities with KDM? What can I try to get rid of this problem. I would like to keep using KDM if possible.

My specs are as follows:

Display: 15.6” FHD 16:9 LED Backlit Wide screen (1920x1080) Super Clear Matte Type Sager Screen (SKU - SSC005)
Fingerprint Reader: Integrated Fingerprint Reader
Graphics Video Card: NVIDIA® GeForce™ GTX 860M (4.0GB) GDDR5 PCI-Express DX11 [User Upgradeable] (SKU – GPU14X)
Memory Card Reader: Internal 9-in-1 Card Reader (MMC/RSMMC/SD/Mini SD/SDHC/SDXC/MS/MS Pro/MS Duo)
Intel® Dual Band AC 7260 802.11 A/AC/B/G/N 2.4/5.0GHz + Bluetooth™ 4.0
Optical Drive Bay: 8X Super Multi DVDRW/CDRW Combo Drive (Sager)
Primary Hard Drive: 1TB 5400RPM [SATA II - 3GB/s] (SKU - HDD098)
Processor: Sager - 4th Generation Intel® Haswell Core™ i7-4710MQ (2.5GHz - 3.5GHz, 6MB Intel® Smart Cache) (SKU – SPU201)
Ram: 8GB DDR3 1600MHz [1x8GB] Dual Channel Memory (SKU - RAM02S)
Sound Card: Sound Blaster Compatible 3D Audio - Included
Note I have not installed any additional or proprietary drivers (like NVidia)