Some further info - the same behavior occurs with the powersave governor.
It just locks at a low frequency, disables turbo and stays there.

Immediately after reboot:

System:    Host: ed-P35V7 Kernel: 4.11.0-14-generic x86_64 (64 bit gcc: 5.4.0)
           Desktop: Cinnamon 3.4.6 (Gtk 3.18.9-1ubuntu3.3) Distro:
Linux Mint 18.2 Sonya
Machine:   Mobo: GIGABYTE model: P35V7 v: Default string Bios:
American Megatrends v: FB02 date: 11/29/2016
CPU:       Quad core Intel Core i7-7700HQ (-HT-MCP-) cache: 6144 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 22464
           clock speeds: max: 3800 MHz 1: 799 MHz 2: 799 MHz 3: 799
MHz 4: 799 MHz 5: 799 MHz 6: 799 MHz
           7: 799 MHz 8: 799 MHz
Graphics:  Card-1: Intel Device 591b bus-ID: 00:02.0
           Card-2: NVIDIA Device 1ba1 bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 driver: nvidia Resolution:
1920x1080@59.93hz
           GLX Renderer: GeForce GTX 1070/PCIe/SSE2 GLX Version: 4.5.0
NVIDIA 384.59 Direct Rendering: Yes
Audio:     Card Intel Sunrise Point-H HD Audio driver: snd_hda_intel
bus-ID: 00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.11.0-14-generic
Network:   Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit
Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: d000 bus-ID: 02:00.0
           IF: enp2s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
           Card-2: Intel Wireless 8260 driver: iwlwifi bus-ID: 04:00.0
           IF: wlp4s0 state: down mac: <filter>
Drives:    HDD Total Size: 1000.2GB (17.7% used) ID-1: /dev/nvme0n1
model: N/A size: 512.1GB
           ID-2: /dev/sda model: HGST_HTS721010A9 size: 1000.2GB
Partition: ID-1: / size: 30G used: 11G (37%) fs: ext4 dev: /dev/nvme0n1p1
           ID-2: /home size: 184G used: 54G (31%) fs: ext4 dev: /dev/nvme0n1p6
           ID-3: swap-1 size: 32.00GB used: 0.00GB (0%) fs: swap dev:
/dev/nvme0n1p5
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 53.5C mobo: 29.8C gpu: 0.0:65C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 376 Uptime: 4 min Memory: 4053.5/32055.0MB Init:
systemd runlevel: 5 Gcc sys: 5.4.0
           Client: Shell (bash 4.3.481) inxi: 2.2.35

On 16 August 2017 at 15:18, Viresh Kumar [off-list ref] wrote:

Adding PM list instead.

On Tue, Aug 15, 2017 at 8:17 AM, Edward Statham
[off-list ref] wrote:

quoted

Hi, sorry for the direct email but I’ve been unable to find a resolution
to this in forums etc.  I have a laptop with a Intel i7-7700HQ CPU and am
running Linux Mint 18.  The frequency governor is set to performance but
it keeps on throttling down to 70% or even 50% and getting stuck there,
for example:

cat /sys/devices/system/cpu/intel_pstate/max_perf_pct
70

I can’t find a way to get it to throttle sensibly i.e. lower the max
when required but revert to full speed when other conditions allow. I’ve
tried the ondemand and performance governors.

Any suggestions would be much appreciated.

thanks,
Ed
--
To unsubscribe from this list: send the line "unsubscribe cpufreq" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html