Earlier this week I published Linux 3.9 through Linux 4.9 kernel benchmarks looking at the raw performance of various subsystems when testing each of the major kernel releases as far back as this Core i7 Haswell system was supported. From that same system, today is a look at testing the kernels going back to Linux 3.11 when Haswell graphics support was first in good shape for this Core i7 4790K box while looking at the raw power consumption and performance-per-Watt for these 19 major kernel releases.
This morning I published the Power Consumption and Efficiency Of The Linux Kernel For The Last Three Years article containing power consumption data for an Intel Haswell system going back to the Linux 3.11 kernel through Linux 4.9 Git. Those were some interesting power consumption numbers under load while here are the idle numbers.
The idle tests were still running this morning so I opted to post them later since they're interested in their own right. The same i7-4790K system was used for benchmarking all of these kernels from Linux 3.11 to Linux 4.9 (25 October Git). No other changes were made during the testing process. Each kernel was freshly booted to the Unity desktop and then launched the idle power consumption test for a period of three minutes while monitoring the AC power draw as reported by the WattsUp Power meter. Automating this with the Phoronix Test Suite: MONITOR=sys.power phoronix-test-suite benchmark idle.
Lenovo Issues Yoga Laptop BIOS Update To Fix Linux Woes
Last month was the controversy over some Lenovo Yoga laptops not working with Linux that was first alleged to be due to a Microsoft "Signature PC" requirement that later turned out to be incorrect. Well, the good news now is that Lenovo has issued a BIOS update and should allow for better Linux compatibility.
The new BIOS release that's specifically targeting Linux users now creates an AHCI SATA Controller Mode option from the BIOS and once that's enabled, you should have no problems installing Linux on the Yoga Y900. This BIOS update isn't intended for WIndows users.