tpurtell / pwm

WARNING: USE AT YOUR OWN RISK

Adjusting the value from the default may affect the lifetime of the lamp in your screen. You might end up looking into the abyss. You have been WARNED!

PWM

This is a utility to allow for adjust the PWM driver frequency delivered from Intel Graphics embedded GPU to the embedded LCD panel. It shows you the existing value and lets you pick a new one.

It was inspired by this https://wiki.archlinux.org/index.php/Backlight#Backlight_PWM_modulation_frequency_.28Intel_i915_only.29 and this http://devbraindom.blogspot.com/2013/03/eliminate-led-screen-flicker-with-intel.html But its for Windows x64 instead.

I think the value it reads back and writes is the frequency in Hz. The actual output was not checked via high speed camera or anything like that, but it seems to have the same behavior as sending those intel_reg_write commands from linux with the computed values. The driver actually has two configuration DWORDs, the default for me for these two values in decimal is 2 and 200. This utility just keeps the first value as read back from the driver and changes only the second value. It's possible the first value is duty cycle or mode related, or something completely different. You could experiment using the source code if you aren't afraid to explode.

LICENSE

Public domain

pwm's Issues

No cmd support

Please add ability to set frequency without gui

failed set get PWM:23

Error running on Win10 v1809

MissingMethodException

Hi,
I'm trying to use the tool on HP 2570p, which is notorious for having PWM set too low, however on Win7 x64 I'm getting the following error:

Unhandled Exception: System.MissingMethodException: Method not found: 'System.Ty
pe System.Runtime.InteropServices.Marshal.GetTypeFromCLSID(System.Guid)'.
at IntelPWMCA.Program.Main(String[] args)

GFX is Intel HD 4000
2015 C++ runtime libs installed (both x86 and x64)
.NET framework at 4.0

Any idea what might be the cause?

不好用了 it doesn't work

最近我点击 PWM.exe ， 没有反应了， 没有弹出框，之前一直是稳定运行的。是不是windows系统更新的原因？

（recently, when I click the PWM.exe, it doesn't work , and it don't have Popup ）