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[Discontinued][17-09-22] RatRefresh - refresh rate switcher, stops LCD tearing
Rataplan626:
You clearly took it a bit further already than I did :) I hadn't though about decompiling the intel software. Nor have I even done such thing before. But you only know what you can achieve after you've tried :)
I have a little spare time today, I will try to work with ChangeDisplaySettingsEx. Thanks so far headkase! I might call on your expertise again.
However now I think of it, I wonder if that's what I had in mind. It might achieve the same goal, but I think using this method doesn't use EDID at all. I'll see if I can get it to work :)
Rataplan626:
I've had a look, and while I don't have a working test yet, I still have my thoughts. ChangeDisplaySettingsEx can indeed be used to set a specific resolution and sort of a specific refresh rate. However, in the DEVMODE structure which holds the display settings, the refreshrate is defined in Hertz, and as a word or dword (integer or long in my VB.net case) making it impossible to set something like 59.150 Hertz.
However, when you create a custom resolution with a decimal refresh rate in the Intel panel, it becomes available as the nearest rounded number in terms of Hertz. When I create a custom resolution of 59.150Hz, I can switch to that with whatever resolution switching method by switching to 59Hz. (Check it - when you do so, even in the Windows resolution switcher a new refresh rate of 59Hz is available which is in fact the 59.150 Hz one just created). So despite the fact I'll have to fiddle out what format they use in those registry values (they sure have a different format than the EDID I am using so far) I am quite afraid that that is not enough. As I've tested before, just having the registry there is not enough at least for all resolution switchers I've tested so far to be able to switch to that resolution, until the videodriver is restarted.
Headkaze, with your extracted Intel dll utility, when you add a resolution, does it 'reset' the screen for a moment - ie. does it go blank for a little?
headkaze:
--- Quote from: Rataplan626 on February 09, 2017, 10:52:08 am ---Headkaze, with your extracted Intel dll utility, when you add a resolution, does it 'reset' the screen for a moment - ie. does it go blank for a little?
--- End quote ---
Yes it does. Right now though I have only implemented "Basic Mode" which will only accept an integer for refresh rate (dwRR) just like the Intel Control Panel.
--- Code: --- [StructLayout(LayoutKind.Sequential, Pack=4)]
public struct _CUI_BASIC_MODE
{
public uint dwColor;
public int bScanType;
public uint dwRR;
public uint dwHActive;
public uint dwVActive;
public uint dwTimingAlgo;
public uint dwUnderscan;
public uint dwHEffective;
public uint dwVEffective;
public int bIsValid;
}
--- End code ---
Advanced mode on the other hand does accept a "double" value for dwVScanRate. If you want me to implement the Advanced Mode then I need to know how it automatically calculates the following values; "Pixel Clock" (dwPixelClock), "Horizontal Scan Rate" (dwHScanRate), "Horizontal Total" (dwHTotal) and "Vertical Total" (dwVTotal).
--- Code: --- [StructLayout(LayoutKind.Sequential, Pack=8)]
public struct _CUI_ADV_MODE
{
public uint dwColor;
public int bScanType;
public uint dwHActive;
public uint dwHFrontPorch;
public uint dwHBackPorch;
public uint dwHSyncWidth;
public int bHSyncPolarity;
public double dwHScanRate;
public uint dwVActive;
public uint dwVFrontPorch;
public uint dwVBackPorch;
public uint dwVSyncWidth;
public int bVSyncPolarity;
public double dwVScanRate;
public uint dwHTotal;
public uint dwVTotal;
public double dwPixelClock;
public int bIsValid;
}
--- End code ---
Rataplan626:
I was just looking into the advanced mode. In the Intel panel I cannot supply a decimal in the scan-rate field. So with that I still can't do 59.150 for example, but that doesn't mean the function inside the Intel dll doesn't support it since it accepts a double.
Horizontal total = front porch + back porch + sync width + active
Same for vertical, just add the values up for the total vertical
pixelclock is horizontal total * vertical total * refresh rate / 1000000 (as it's handled in MHz)
horizontal scanrate = vertical total * refresh rate
I'm now checking what format is used to store the custom resolutions from the Intel panel, and wheter that can be used on other brand cards as well.
headkaze:
Okay I added an "Advanced Mode" to my utility which uses those calculations. I parse "vscanrate" as a double and pass it to set_AddCustomMode without modification. Sorry but I have not tested "Advanced Mode" yet. Also you need to have Intel HD Graphics Control Panel installed for this to work as I do not include igfxDHLib.dll or any other library this app may depend on.
--- Code: ---IntelAddCustomMode v1.1 - by headkaze
USAGE: IntelAddCustomMode.exe mode=basic|adv|list|remove [options]
General Options:
verbose=true Verbose Output
Basic Options:
width=n Width
height=n Height
refreshrate=n Refresh Rate
interlaced=true|false Interlaced Mode
underscan=n Underscan Percentage
timing=gtf|cvt|cvtrb|cea861 Timing standard
Example: IntelAddCustomMode mode=basic width=800 height=600 refreshrate=60
Advanced Options:
interlaced=true|false Interlaced Mode
hactive=n Active (Horizontal)
hfrontporch=n Front Porch (Horizontal)
hbackporch=n Back Porch (Horizontal)
hsyncwidth=n Sync Width (Horizontal)
hsyncpolarity=+|- Sync Polarity (Horizontal)
vactive=n Active (Vertical)
vfrontporch=n Front Porch (Vertical)
vbackporch=n Back Porch (Vertical)
vsyncwidth=n Sync Width (Vertical)
vsyncpolarity=+|- Sync Polarity (Vertical)
vscanrate=n Scan Rate (Vertical) in Hz
Remove Options:
index=n Index of the Mode to Remove (from mode=list)
--- End code ---
Download IntelAddCustomMode.zip
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