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Author Topic: edited EDID does not work properly for HDMI  (Read 10133 times)
Mangix
Guest
« on: April 12, 2011, 02:28:35 AM »

hello,

I have a monitor connected through HDMI at 1080p. The monitor's EDID states that the signal is a DVI signal and as a result I can only go up to 165Mhz pixel clock. If i change the type to HDMI-A, I can go over that but if I do that, I lose the sound from my GPU to my TV since the GPU thinks that the newly edited EDID is a regular DVI monitor for some reason.

Any thoughts on how I can solve this? When making the EDID file I only change the dvi to HDMI-A in the options page and then click create inf. Can I also use PowerStrip to do the same thing?
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Ashley Saldanha
Administrator
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Posts: 1806


« Reply #1 on: April 12, 2011, 05:30:01 AM »

It is impossible to answer a question like this without knowing a lot more about your hardware, starting with the original EDID vs. the actual capabilities of the display device.
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Mangix
Guest
« Reply #2 on: April 12, 2011, 01:49:43 PM »

multires' assessment of the EDID is as follows.

Code:
Monitor
  Model name............... Philips
  Windows description...... Philips 105S (105S2)
  Manufacturer............. Philips
  Plug and Play ID......... PHL0001
  Serial number............ n/a
  Manufacture date......... 2007, ISO week 44
  Filter driver............ Monitor
  -------------------------
  EDID revision............ 1.3
  Input signal type........ Digital
  Color bit depth.......... Undefined
  Display type............. RGB color
  Screen size.............. 710 x 400 mm (32.1 in)
  Power management......... Standby
  Extension blocs.......... 1 (Reserved - 0x00)
  -------------------------
  DDC/CI................... n/a

Color characteristics
  Default color space...... Non-sRGB
  Display gamma............ 2.20
  Red chromaticity......... Rx 0.617 - Ry 0.334
  Green chromaticity....... Gx 0.283 - Gy 0.590
  Blue chromaticity........ Bx 0.143 - By 0.086
  White point (default).... Wx 0.284 - Wy 0.295
  Additional descriptors... None

Timing characteristics
  Horizontal scan range.... 31-80kHz
  Vertical scan range...... 47-85Hz
  Video bandwidth.......... 140MHz
  CVT standard............. Not supported
  GTF standard............. Not supported
  Additional descriptors... None
  Preferred timing......... Yes
  Native/preferred timing.. 1920x1080p at 60Hz (16:9)
    Modeline............... "1920x1080" 148.500 1920 2008 2052 2200 1080 1084 1088 1125 -hsync -vsync
  Detailed timing #1....... 1360x768p at 60Hz (16:9)
    Modeline............... "1360x768" 85.500 1360 1424 1536 1792 768 771 778 795 -hsync -vsync

Standard timings supported
     640 x  480p at  60Hz - IBM VGA
     800 x  600p at  60Hz - VESA
    1024 x  768p at  60Hz - VESA
    1280 x 1024p at  60Hz - VESA STD

Report information
  Date generated........... 4/12/2011
  Software revision........ 2.59.0.934
  Data source.............. Registry
  Operating system......... 6.1.7601.2.Service Pack 1

Raw data
  00,FF,FF,FF,FF,FF,FF,00,41,0C,01,00,01,01,01,01,2C,11,01,03,80,47,28,78,8A,28,8E,9E,55,48,97,24,
  16,48,4B,21,08,00,81,80,01,01,01,01,01,01,01,01,01,01,01,01,01,01,02,3A,80,18,71,38,2D,40,58,2C,
  44,00,C4,8E,21,00,00,18,66,21,50,B0,51,00,1B,30,40,70,37,00,C4,8E,21,00,00,18,00,00,00,FC,00,50,
  68,69,6C,69,70,73,0A,20,20,20,20,20,00,00,00,FD,00,2F,55,1F,50,0E,00,0A,20,20,20,20,20,20,01,DB

powerstrip says that the maximum scan rate is 80Hz and 85Hz for horizontal and vertical respectively. That matches up with my experience which has been that going above 80Hz fails even using HDMI-A. but to even get close to it, i need to use HDMI-A which the default EDID does not provide. A DVI signal maxes out at 165.01 pixel clock and as a result can't be used.
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Ashley Saldanha
Administrator
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Posts: 1806


« Reply #3 on: April 12, 2011, 02:49:39 PM »

Your display has a conservatively rated peak video bandwidth of 140MHz - typical for LCD-TVs - not the 165MHz maximum for single digital DVI, and certainly not beyond that. It can probably handle up to 150MHz safely.

By Philips' spec it should never be driven above 85Hz, 80kHz or 148.50Mhz. That means at 1920x1080 a max of 60Hz, because at 60Hz you are already pushing over 148MHz. At 1680x1050, you can probably run 75Hz but not beyond because that would exceed the 80kHz maximum. At 1360x768 you can probably run 85Hz, but really this is a digital fixed frequency LCD and it is going refresh internally at 60Hz no matter what your graphics card outputs.

So instead of trying to push this LCD-TV above spec, or like it was a multisync CRT, you should think instead of what it is you are attempting to achieve here and why?
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Mangix
Guest
« Reply #4 on: April 12, 2011, 11:07:57 PM »

i know that refresh rates over 80Hz don't work(cable can send them, TV doesn't support them) but with an edited EDID file i've been able to push it to 79Hz where it worked just fine. I'm trying to do this as I play many FPS games and I need all the frames that can be displayed.
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Ashley Saldanha
Administrator
*****
Posts: 1806


« Reply #5 on: April 13, 2011, 05:25:23 AM »

80Hz is not a VESA standard, so you would need to use a DTD (detailed timing descriptor). The two predefined by Philips are 1920x1080x60Hz and 1360x768x60Hz. You need to change one or both of those to an 80Hz timing you feel your display can handle using the EDID editor of your choice.
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