Posted by: goku« on: March 19, 2015, 00:37:30 »
"In order to play a DVD without hiccups, we set the energy profile to "Balanced" and turned the wireless modules off. The notebook managed 2 hours and 42 minutes."
First of all, I have this laptop. Even in the most conservative power saving mode, the laptop plays DVDs perfectly without hiccups, ever. I can understand the choice of using the "balanced" setting as that's what most people will have the laptop set but unfortunately, that setting will lead to weak battery life due to the excitability of the processor to want to clock up to its maximum clocks. Had they utilized the power saving mode, laptop would have lasted about twice as long in the DVD test.
But, even that notwithstanding, I'm bothered by the idea that any laptop made in the last 10 years would have to resort to running at anything but minimum speed in order to play a DVD. Why? Because DVD decoding on a NON hardware accelerated setup shouldn't require more than 300-600MHZ of MMX (Pentium I MMX/II) accelerated processing power. That means most laptops made after 1998 can handle playback of a DVD no problem. However, all laptops with ATI/AMD or Nvidia hardware have been equipped with some form of Hardware Accelerated Motion Compensation, IDCT and display rendering since about 1999 and Intel Accelerated chips since about 2001-2. Hardware DVD acceleration reduces the CPU utilization and therefore requirements so much so, that one with a decent video card made after 1999 (even PCI) could reliably watch a DVD on something like a Pentium 133-166mhz though results would vary.
So, even in the worst case scenario of using 1990s technology in current CPU architecture AND having NON hardware accelerated DVD playback, 600mhz of CPU utilization would only lead to 42% cpu utilization on ONE SINGLE CORE if the CPU is set to the minimum setting which on this laptop is 1400mhz.
So either the DVD playback program you're using is a POS or you have something running in the background that is skewing results OR the "Balanced" setting was completely unnecessary as DVD playback should be more than sufficient with the "Power Saver" setting.