Lenovo T440p laptop with Intel CPU remains at lowest clock (Win7)

I have an Lenovo T440p with an Intel Core i5 4300M CPU. 8GB RAM, SSD running with Windows 7 (preinstalled).
The only thing I did not like about this laptop was the screen, which I replaced (the whole LCD unit from another T440p - including the hinges) with a hd res version. It was rather easy; I did not have to remove the CPU/GPU.
Recently I noticed is that the laptop has become really slow, especially running VMs. In task manager I can see that the CPU is many times at 100% on all cores. CPU-Z is reporting that the CPU is running at the lowest possible clock:
    Core Speed: 798.85 MHz
    Multiplier x8
    Bus Speed 99.87 MHz
    Core Voltage of 0.659 V
I have set Windows already to "Maximum Performance" in the energy settings. I have also taken out the battery and am running with the power adapter. I also set the Lenovo Power Manager to maximum performance. Sadly, no improvement.
What else can I try?

xi-berger wrote:
@jck & @awaller well not literally every other time, it occurs randomly. sometimes I can work for like an hour or as long as I want and nothing happens, sometimes after 5 minutes *boom* the screen goes black, except of one column with random pixels, i tried to switch to a different console with ctrl+alt+(F1-F6) but it did not work...
do you know where I have to look for errors? I also tried to reinstall the drivers, but it did not help..
I see something like this on my T420 Thinkpad sometimes. It turns out the backlight is just going out. I'm reluctant to say it's a kernel issue and not hardware - I have vague memories of it happening on Windows 7 as well, but that was years ago ...
It happens on Arch and Debian definitely, and the following fix works on both for me:
Opening a terminal (which I have bound to a key) and running "xset dpms force off", then moving the mouse or something to wake the display again brings it back to light.
Try that the next time it happens and see if it helps. Will at least confirm whether it's the same issue as me or not.

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