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How disable interlaced screen mode?

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First post, by Gelip

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Windows NT 4.0 Workstation SP6
PCIe NVIDIA 6200 TurboCache
71.84 driver
Monitor/TV LG 22MT44DP
Cable connection: DVI > HDMI

By default, the scaling in the driver is set as in the screenshot - option 3 (Skalowanie monitora)

The attachment scaling_default.png is no longer available

When I try to change the option to another 1, 2 or 4, the monitor switches to interlace mode, which causes the image to be blurry:

The attachment blurry.jpg is no longer available

How to change to progressive mode?

Last edited by Gelip on 2025-11-27, 19:24. Edited 2 times in total.

Reply 1 of 3, by Gelip

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I managed to do it but in a similar TV model LG 42LF2510

You need to remove the CEA extension from the EDID data of the HDMI connector and write a new one to the monitor, e.g. using PowerStrip 3.83 (full) and ATI 9550 AGP graphics card - this really works 😀 😀
https://www.elektroda.pl/rtvforum/viewtopic.p … 761860#21761860

The attachment no_CEA.png is no longer available
The attachment RS232.png is no longer available
The attachment HDMI2.jpg is no longer available
The attachment HDMI2.png is no longer available

Now I can choose any scaling mode in NVIDIA driver settings and the interlace mode does not turn on - it still works in progressive mode 😀 😀

Reply 2 of 3, by Gelip

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PowerStrip can also program EDID using a PCIe NVIDIA 6200 card, but:

  • EDID EEPROM cannot be write-protected mode - I test on LG 42LF2510. It didn't work with the 22MT44DP model from the first post because it has EEPROM in write-protected mode !!!
  • the system must be WinXP or probably newer
  • PowerStrip must be in the full version - newer than 3.63 - I tested with 3.85. Old version 3.63 is the last version that works on NT 4.0 but it cannot program EDID, newer versions do not work on NT 4.0
  • NVIDIA card driver cannot be installed or WinXP needs to be restarted to VGA mode
    VGA-mode.png
  • in WinXP on Haswell, only 185.85 drivers are installed and with EDID CEA there is the same problem as in Win NT 4.0 - no scaling and interlaced mode. After changing EDID to no_CEA, everything works OK and scaling is available
The attachment 6200_EDID_OK.png is no longer available
The attachment CEA_HDMI.png is no longer available
The attachment CEA_no_scaling.png is no longer available
The attachment no_CEA_DVI.png is no longer available
The attachment no_CEA_scalling.png is no longer available

P.S. EDID can also be changed in Linux, e.g. Debian 9, using i2c-tools:

Spoiler
root@debian:~# i2cdump -y 1 0x50
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 ff ff ff ff ff ff 00 1e 6d 01 00 01 01 01 01    ........?m?.????
10: 02 13 01 03 80 73 41 78 0a cf 74 a3 57 4c b0 23    ?????sAx??t?WL?#
20: 09 48 4c a1 08 00 81 80 61 40 45 40 31 40 01 01    ?HL??.??a@E@1@??
30: 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c    ???????:??q8-@X,
40: 45 00 7e 8a 42 00 00 1e 01 1d 00 72 51 d0 1e 20    E.~?B..???.rQ??
50: 6e 28 55 00 7e 8a 42 00 00 1e 00 00 00 fd 00 3a    n(U.~?B..?...?.:
60: 3e 1e 53 10 00 0a 20 20 20 20 20 20 00 00 00 fc    >?S?.?      ...?
70: 00 4c 47 20 54 56 0a 20 20 20 20 20 20 20 01 04    .LG TV?       ??
80: 02 03 26 f1 4e 10 1f 84 13 05 14 03 02 12 20 21    ??&?N????????? !
90: 22 15 01 26 15 07 50 09 57 07 67 03 0c 00 20 00    "??&??P?W?g??. .
a0: b8 2d e3 05 03 01 01 1d 80 18 71 1c 16 20 58 2c    ?-????????q?? X,
b0: 25 00 7e 8a 42 00 00 9e 01 1d 00 80 51 d0 0c 20    %.~?B..???.?Q??
c0: 40 80 35 00 7e 8a 42 00 00 1e 02 3a 80 18 71 38    @?5.~?B..??:??q8
d0: 2d 40 58 2c 45 00 7e 8a 42 00 00 1e 66 21 50 b0    -@X,E.~?B..?f!P?
e0: 51 00 1b 30 40 70 36 00 7e 8a 42 00 00 1e 00 00    Q.?0@p6.~?B..?..
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e9    ...............?
root@debian:~# i2cset -y 1 0x50 0x7e 0x00
root@debian:~# i2cset -y 1 0x50 0x7f 0x05
root@debian:~# i2cdump -y 1 0x50
No size specified (using byte-data access)
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 ff ff ff ff ff ff 00 1e 6d 01 00 01 01 01 01    ........?m?.????
10: 02 13 01 03 80 73 41 78 0a cf 74 a3 57 4c b0 23    ?????sAx??t?WL?#
20: 09 48 4c a1 08 00 81 80 61 40 45 40 31 40 01 01    ?HL??.??a@E@1@??
30: 01 01 01 01 01 01 02 3a 80 18 71 38 2d 40 58 2c    ???????:??q8-@X,
40: 45 00 7e 8a 42 00 00 1e 01 1d 00 72 51 d0 1e 20    E.~?B..???.rQ??
50: 6e 28 55 00 7e 8a 42 00 00 1e 00 00 00 fd 00 3a    n(U.~?B..?...?.:
60: 3e 1e 53 10 00 0a 20 20 20 20 20 20 00 00 00 fc    >?S?.?      ...?
70: 00 4c 47 20 54 56 0a 20 20 20 20 20 20 20 00 05    .LG TV?       .?
80: 02 03 26 f1 4e 10 1f 84 13 05 14 03 02 12 20 21    ??&?N????????? !
90: 22 15 01 26 15 07 50 09 57 07 67 03 0c 00 20 00    "??&??P?W?g??. .
a0: b8 2d e3 05 03 01 01 1d 80 18 71 1c 16 20 58 2c    ?-????????q?? X,
b0: 25 00 7e 8a 42 00 00 9e 01 1d 00 80 51 d0 0c 20    %.~?B..???.?Q??
c0: 40 80 35 00 7e 8a 42 00 00 1e 02 3a 80 18 71 38    @?5.~?B..??:??q8
d0: 2d 40 58 2c 45 00 7e 8a 42 00 00 1e 66 21 50 b0    -@X,E.~?B..?f!P?
e0: 51 00 1b 30 40 70 36 00 7e 8a 42 00 00 1e 00 00    Q.?0@p6.~?B..?..
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e9    ...............?

Reply 3 of 3, by Gelip

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I managed to achieve the same on LG 22MT44DP (with write-protected EDID) using the DIGITUS EDID HDMI emulator DA-70466 😀

The attachment DA-70466.png is no longer available

How I did it:

  • you need another TV/Monitor in which you can write-enabled EDID and use Linux to write EDID with CEA extension removed
  • since the NVIDIA 6200 graphics card has a DVI output, we need a HDMI-DVI adapter:
    The attachment HDMI-DVI.png is no longer available
  • connect DIGITUS, set it to clone mode and copy EDID
  • now just connect the target LG:
    NVIDIA 6200 DVI > HDMI-DVI adapter > DIGITUS > HDMI-HDMI cable > LG 22MT44DP

Everything works as it should - all scaling modes works in progressive mode - no interlaced, no blurry fonts and fullscreen CMD apps works in properly scaling mode e.g CCS64 commad line emulator set to 400x300 resolution 😀
The video signal flows through DIGITUS from the graphics card to the monitor, but the EDID is from DIGITUS instead of the monitor.

The attachment DIGITUS_NO_CEA1.png is no longer available
The attachment DIGITUS_NO_CEA2.png is no longer available
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