Refresh rate limit at 60 Hz: Unable to set more (CRT).

Hi there.

 

So, around 2 months ago my old GFX-Card (ATI HD 4890) caught fire so I had to replace it. I bought a new ATI HD 5850 and I have this annoying problem; I can't use more than 60 Hz now.

 

With my HD4890 I could use 100Hz on 1152*864, but this one adds a limit at 60 Hz.

Note: The 'limit' is only there when I've installed the drivers from ati.amd.com, without them I can use up to 85 Hz. According to Catalyst the monitors EDID says "max 60 Hz", but even if I click "Override EDID with these settings" and pick 100 Hz I still can't change past 60 Hz.

I can, however, reinstall the drivers and use 100 Hz until:

  • I restart the computer, or Catalyst does 'detect displays'.
  • I mark "Override EDID with these settings" and pick 1152*864 as max resolution (this is needed to be able to pick 1152*864, otherwise only 1024*768 (and higher) exists).

I've tried programs like Refreshlock to force it over 100 Hz, but without any success.

I've emailed ATI several times, and their first reply (almost 2 months ago) was that it was a bug (unable to change Hz on CRT-monitors) and that it was gonna be resolved with Catalyst 10.6. I'm now using 10.7 and the bug still remains, I contacted ATI again and this time they didn't mention any bug - instead told me that I could create some custom driver file to override the EDID information.

 

So my question is; Is it possible to, and if so how do I, create a 'fake' EDID response?

 

Here's the information given to me by MonInfo:

Monitor
  Model name............... K-900
  Windows description...... Generic PnP Monitor
  Manufacturer............. KTC
  Plug and Play ID......... KTC1900
  Data string.............. K T C Monitor Made In China
  Serial number............ n/a
  Manufacture date......... 2004, ISO week 29
  -------------------------
  EDID revision............ 1.0
  Input signal type........ Analog 0.700,0.300 (1.0V p-p)
  Sync input support....... Separate
  Display type............. RGB color
  Screen size.............. 360 x 270 mm (17,7 in)
  Power management......... Standby, Suspend, Active off/sleep
  Extension blocs.......... None
  -------------------------
  DDC/CI................... n/a

Color characteristics
  Default color space...... Non-sRGB
  Display gamma............ 2,53
  Red chromaticity......... Rx 0,625 - Ry 0,340
  Green chromaticity....... Gx 0,310 - Gy 0,529
  Blue chromaticity........ Bx 0,150 - By 0,063
  White point (default).... Wx 0,281 - Wy 0,311
  Additional descriptors... None

Timing characteristics
  Range limits............. Not available
  GTF standard............. Not supported
  Additional descriptors... None
  Preferred timing......... No

Standard timings supported
     720 x  400p at  70Hz - IBM VGA
     640 x  480p at  60Hz - IBM VGA
     640 x  480p at  75Hz - VESA
     800 x  600p at  75Hz - VESA
    1024 x  768p at  60Hz - VESA
    1024 x  768p at  70Hz - VESA
    1024 x  768p at  75Hz - VESA
    1280 x 1024p at  75Hz - VESA
    1152 x  870p at  75Hz - Apple Mac II
     640 x  480p at  85Hz - Manufacturer
     800 x  600p at  85Hz - Manufacturer
    1024 x  768p at  85Hz - Manufacturer
    1280 x 1024p at  85Hz - Manufacturer
    1600 x 1200p at  75Hz - Manufacturer
     800 x  600p at  85Hz - VESA STD
    1024 x  768p at  85Hz - VESA STD
     800 x  600p at 100Hz - VESA STD
    1024 x  768p at 100Hz - VESA STD
    1280 x 1024p at  85Hz - VESA STD
    1600 x 1200p at  60Hz - VESA STD
    1600 x 1200p at  70Hz - VESA STD
    1600 x 1200p at  75Hz - VESA STD

Report information
  Date generated........... 2010-08-05
  Software revision........ 2.51.0.853
  Operating system......... 6.1.7600.2

Raw data
  00,FF,FF,FF,FF,FF,FF,00,2E,83,00,19,00,00,00,00,1D,0E,01,00,08,24,1B,99,E8,06,92,A0,57,4F,87,26,
  10,48,4F,A4,4F,FF,45,59,61,59,45,68,61,68,81,99,A9,40,A9,4A,A9,4F,00,00,00,FC,00,4B,2D,39,30,30,
  0A,20,20,20,20,20,20,20,00,00,00,FE,00,4B,20,54,20,43,0A,20,20,20,20,20,20,20,00,00,00,FE,00,4D,
  6F,6E,69,74,6F,72,0A,20,20,20,20,20,00,00,00,FE,00,4D,61,64,65,20,49,6E,20,43,68,69,6E,61,00,88

 

Best regards.

 

Question Info


Last updated October 10, 2019 Views 2,120 Applies to:
Answer
Answer

I think I've fixed it.

I used MonInfo to create a .inf that I loaded as a driver to the monitor, and I can now set the Hz to 100 using CCC.

 

Cheers for your advices!

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