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override EDID data

post #1 of 3
Thread Starter 
Basically the thing is. NVIDIA drivers read out your display's EDID data to get the supported resolutions etc. There are some devices out there that report they are capable of black levels 16-235. On regular monitors the HDMI levels are set to full 0-255 range for black<->white.
If the source outputs at range 16-235 and your display thinks it receives at range 0-255 black will be a washed out grey and white will be light gray. NVIDIA drivers don't seem to allow overriding this EDID data so if the display's EDID data is borked, you're stuck.

There exists a registry hack in the NVIDIA drivers that I've been using for several years now. Originally I've found some thread at hardforum that explained the fix for some tv set from westinghouse.
Code:
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\{4D36E968-E325-11CE-BFC1-08002BE10318}\0000]
"OverrideEdidFlags0"=hex:4c,a3,04,a5,00,00,ff,ff,04,00,00,00,7e,01,00
This is specific for the first GPU that windows ever saw and the hex values are specific for an Epson TW2000 beamer. With this hack windows will always use the extended 0 - 255 range for that device.

What I'm looking for is a way to enforce this range without resorting to mad registry hacks. Does anyone know of some tool or something that makes this possible?
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the meth lab
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post #2 of 3
Sounds like it's not do-able without re-writing the driver or using a driver hack.

Excellent tool though, but not sure how much useful it will be for you:
http://www.entechtaiwan.com/util/moninfo.shtm
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post #3 of 3
Thread Starter 
Things sure look like this registry hack is the only option.
Hmm that moninfo tool at least gets the device ID hex values. Should I ever decide to get a new display that has the same issues, I'd need to adjust the hex values from the above string to the new display.
Thanks
I wonder what all of the rest in the EDID means though. Someone somewhere mentioned he just hacked together some values that disabled extended EDID data but then his HDMI sound output was disabled.
the meth lab
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the meth lab
(22 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770k sabertooth z77 EVGA GTX 780 SC Corsair Vengeance 
Hard DriveHard DriveHard DriveCooling
crucial c300 crucial m4 WD 40EFRX Alphacool UT-60 FC 
CoolingCoolingCoolingCooling
Gentle Typhoon AP15 Laing DDC 3.25 /w EK X-Top Aquaero 5 XT Aqualis XT reservoir /w RGB LED 
CoolingCoolingOSMonitor
AquaComputer Kryographics 780GTX GPU block DT Sniper CPU block windows 7 x64 ultimate Sony VPL HW50ES projector 
KeyboardPowerCaseMouse
Logitech K800 Seasonic X-1250 InWin D-Frame orange/blue Roccat Pyra Wireless 
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Puretrak Talent Asus Xonar Essence STX 
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