BIOS BUG REPORT: XPS13-9343 i7 CPU performance became low after AC remove and insert

XPS13-9343  i7 CPU performance became low after AC remove and insert

same problem like http://en.community.dell.com/support-forums/laptop/f/3518/t/19660225

normal: 2.4-2.9 ghz

remove AC: 0.8-1.3 ghz

insert again: 1.3 ghz

after reboot or sleep resume normal.

uninstall intel cppc drivers: 0.8-1.3 ghz always

system: windows 10 64bit (power setting: "high performance")

cpu: i7 5500

bios: a07

tools: cpu-z AIDA64

@DELL-Colin H