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Author Topic: Update EDID has stopped working - help please!  (Read 76500 times)
sundaythinking

Posts: 8


« on: March 28, 2006, 12:28:31 PM »

I have been attempting to update the EDID of my Toshiba 27WL46 so that my ATI graphics card can recognise its DVI connection.

Although I started off having no problems at all updating the EDID (something which I managed 6 or 7 times), I have now lost the ability to do so - I just get an error questioning whether the EPROM is write-protected.

I am now worried that there is a limit to the number of times that you can update the EDID?
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Rik Wang
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« Reply #1 on: March 28, 2006, 03:43:20 PM »

There is a limit, but its usually in the tens, if not hundreds of thousands of write/erase ops.

Try unplugging the Toshiba completely from the electrical outlet, wait a few minutes, then plug it back in, and make sure you are not running any other utilities that talk to the ATI card, including CCC. In fact, nothing else should be running, software-wise.
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sundaythinking

Posts: 8


« Reply #2 on: March 29, 2006, 03:55:28 AM »

Thanks Rik - that did the job.

However, I am still finding it impossible to get my ATI 7000 card to recognise my Toshiba as having a DVI output. It only ever works through the VGA connection (as an analogue Microsoft plug and play device), although MonInfo recognises it as a digital device connected on an auxillary port.

I can provide a copy of the information from MonInfo if necessary, but it seems clear to me that I am simply not getting the EDID correct. The EDID for my specific TV that I coppied from an earlier post on this site didn't work, and I don't know what numbers I should be changing.

Any advice would be greatfully received!
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Rik Wang
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« Reply #3 on: March 29, 2006, 04:44:59 AM »

Post the MonInfo report of your updated EDID, but if MonInfo can read it, then the EDID is valid and you aren't looking at an EDID issue. It doesn't mean the data is correct for your display, but it is valid data.

Will the 7000 card POST to the Toshiba?
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sundaythinking

Posts: 8


« Reply #4 on: March 29, 2006, 05:07:35 AM »

I suspected that I was simply getting the EDID numbers wrong. I will post the MonInfo report tonight. However, the 7000 does not even POST, which I would find very worrying if it wasn't for the fact that I have heard that it is not uncommon for ATIs to not POST when the EDID is incorrect for a digital conenction.

Thanks again, Rik.
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Rik Wang
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« Reply #5 on: March 29, 2006, 05:57:05 AM »

If the EDID was for an analog device, or the timing in the EDID was beyond the capabilities of your display, then you won't see the POST. What you need to determine is if:

a. it is not POSTing
b. it is POSTing, but you can't see anything on the display
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thekochs

Posts: 68


« Reply #6 on: March 29, 2006, 11:39:03 AM »

Quote from: "Rik Wang"
If the EDID was for an analog device, or the timing in the EDID was beyond the capabilities of your display, then you won't see the POST. What you need to determine is if:

a. it is not POSTing
b. it is POSTing, but you can't see anything on the display


For those of us following this thread like me what is POST ?  I know of BIOS POST that shows items as PC boots but I'm suspecting you mean something else.  Also, it may or may not help that until Catalyst 6.2 drivers the DVI detection function was not working correctly.  Here is the AVS Forum link.
http://www.avsforum.com/avs-vb/showthread.php?t=643586
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Rik Wang
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« Reply #7 on: March 29, 2006, 12:04:37 PM »

POST = PowerOn SelfTest

Long before Windows or the Windows display driver load, the video BIOS first determines if there is a digital device connected and enables output to it. If everything is working correctly and within spec, you should see the full boot process up to the moment at which the Windows display driver loads and takes over. Until that point, the driver version and indeed the OS are irrelevant.
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sundaythinking

Posts: 8


« Reply #8 on: March 29, 2006, 04:14:33 PM »

When the Toshiba is commected to the DVI output, there is absolutely nothing displayed on the screen - no POST, no Windows, nothing.

I have uninstalled all the ATI drivers (which were stopping me from using the Update EDID function). The reference to the "DVI blackout" problem seems interesting, but as far as I know I was using the latest version becuase I only downloaded them last week.

My MonInfo is:

Monitor
  Hardware information........ n/a

Display adapter
  Adapter description......... Primary port
  Display settings............ 1024x768, 32bpp

User/computer information
  Registered user name........ John
  Registered organization..... n/a
  Network user name........... Owner
  Network computer name....... JCK-MEDIA
  Windows version ............ Windows XP
  Windows build .............. 5.01.2600 Service Pack 2
  Installation date .......... 23/07/2005 12:00:00


AND also...

Monitor
  Windows description......... KOC Monitor
  Manufacturer description.... TOSHIBA27WL46
  Manufacturer................ KOC
  ————————————————————————————
  Plug and Play ID............ KOC0482
  Serial number............... SXGA85A_00001
  EDID data source............ I2C bus (real-time)
  ————————————————————————————
  Manufacture date............ 2003, ISO week 26
  EDID revision............... 1.1
  Display type and signal..... Digital
  Sync input support.......... n/a
  Screen size................. n/a
  Power management............ Standby, Suspend, Active off/sleep

Color characteristics
  Display gamma............... 2.88
  Red chromaticity............ Rx 0.609 - Ry 0.352
  Green chromaticity.......... Gx 0.303 - Gy 0.550
  Blue chromaticity........... Bx 0.148 - By 0.128
  White point (default)....... Wx 0.305 - Wy 0.342

Timing characteristics
  VESA GTF support............ Supported
  Horizontal scan range....... 30-93kHz
  Vertical scan range......... 40-86Hz
  Video bandwidth............. 160MHz
  Extension blocks............ n/a
  Timing recommendation #1.... 1280x1024 at 85Hz
      Modeline................ "1280x1024" 157.500 1280 1344 1504 1728 1024 1025 1028 1072 +hsync +vsync

Standard timings supported
   640 x  480 at  60Hz - IBM VGA
   640 x  480 at  67Hz - Mac II
   640 x  480 at  72Hz - VESA
   640 x  480 at  75Hz - VESA
   640 x  480 at  85Hz - VESA
   720 x  400 at  70Hz - IBM VGA
   800 x  600 at  56Hz - VESA
   800 x  600 at  60Hz - VESA
   800 x  600 at  72Hz - VESA
   800 x  600 at  75Hz - VESA
   800 x  600 at  85Hz - VESA
   832 x  624 at  75Hz - Mac II
  1024 x  768 at  60Hz - VESA
  1024 x  768 at  70Hz - VESA
  1024 x  768 at  75Hz - VESA
  1024 x  768 at  85Hz - VESA
  1152 x  864 at  75Hz - VESA
  1280 x  720 at  60Hz - VESA
  1280 x 1024 at  75Hz - VESA
  1280 x 1024 at  85Hz - KOC

Raw EDID base
  00: 00 FF FF FF FF FF FF 00  2D E3 82 04 01 00 00 00
  10: 1A 0D 01 01 81 00 00 BC  EF 0B 32 9C 5A 4D 8C 26
  20: 20 4E 57 BF EF 00 31 59  45 59 61 59 71 4F 81 C0
  30: 01 01 01 01 01 01 86 3D  00 C0 51 00 30 40 40 A0
  40: 13 00 6D 24 11 00 00 1E  00 00 00 FD 00 28 56 1E
  50: 5D 10 00 0A 20 20 20 20  20 20 00 00 00 FF 00 53
  60: 58 47 41 38 35 41 5F 30  30 30 30 31 00 00 00 FC
  70: 00 54 4F 53 48 49 42 41  32 37 57 4C 34 36 00 19

Display adapter
  Adapter description......... Auxiliary port
  Adapter device ID........... 0x51591002
  Display settings............ n/a

User/computer information
  Registered user name........ John
  Registered organization..... n/a
  Network user name........... Owner
  Network computer name....... JCK-MEDIA
  Windows version ............ Windows XP
  Windows build .............. 5.01.2600 Service Pack
2
  Installation date .......... 23/07/2005 12:00:00
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Rik Wang
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« Reply #9 on: March 29, 2006, 06:56:30 PM »

I'm puzzled by why you felt the need to update the EDID to begin with?

This is an LCD, with a very standard 1280x720 native resolution. What was the original EDID? What did you try to change and why?

Is this really a Toshiba *branded* LCD/TV?

Anyway: have a look at this thread, where someone with the same Toshiba model has posted a working EDID.
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sundaythinking

Posts: 8


« Reply #10 on: March 30, 2006, 01:16:18 AM »

I needed to update it because I had the same problem as the guy on the thread you referred me to - not able to use the Toshiba on its DVI connection because of a bad EDID. The EDID that I have updated it with is the one posted on that same thread.

It is definitely a pure Toshiba. I simply want to be able to use its DVI connection rather than the VGA connection. However, I appear to be failing miserably at this.
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Rik Wang
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Posts: 8833


« Reply #11 on: March 30, 2006, 03:25:39 AM »

Let me see if I can get Miika to join us. If he's still around, I'm sure his advice will be invaluable.
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Miika

Posts: 11


« Reply #12 on: March 30, 2006, 06:09:05 AM »

Hey Rik et al. Smiley

First off, sundaythinking, I have a couple of questions:

1. You _did_ update the EDID through the DVI-port, not the VGA port, didn't you? And if you did, how did you manage to update the DVI-EDID if you get no picture with your ATI-card?

2. Can you get PowerStrip to fetch the EDID from your Tosh and compare that it is equal with the file www.cs.tut.fi/~ahdesmak/toshiba.bin (use e.g. the freeware hex editor xvi) ?

From what I gather, you have updated the EDID properly, as have I, but the problem is with the ATI graphics card. I have lost compatibility _several_ times (fortunately I managed to get things back working) when e.g. updating the drivers or doing something else stupid (don't fix something that works..) I can't tell you how I managed to get things working since I really don't know!

What I can tell you is to find a friend who has an NVIDIA graphics card and see if the DVI works as it should. I have two computers at home, the mediaPC with an ATI 9500 card and my gaming-rig with an NVIDIA 7800GT. The tosh works like a dream with the 7800GT (and used to work with a 5900XT I had previously) but is very picky about the ATI card. I can't remember the ATI driver version I currently use with the TOSH but I'll check it later on when I get home.

Rik, in the moninfo post it says that the recommended timing is 1280x1024 @ 85Hz. Since the LCD probably can't do 85Hz, could this cause problems? Should the 1280x720@60Hz be set as the recommended timing in the EDID? I remember putting up the EDID based on the VGA-port EDID, changing a couple of flags, adding the 1280x720@60Hz etc. but not touching the timings otherwise.

Since I haven't been using Moninfo for a while, could you elaborate the "AND also" -part in the moninfo report? I only ever remember getting the first part..? EDIT: That is, when I had problems with the TV. Maybe I now _do_ get the latter part (have to check it when I get home) since I got things working properly.

Miika
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sundaythinking

Posts: 8


« Reply #13 on: March 30, 2006, 06:22:09 AM »

Well - we are reaching the limits of my understanding, but here we go:

1. I updated the EDID through the VGA port (becuase I can only get a picture through the VGA port). As the ATI card switches off the DVI port, I don't see how I can use it to update its EDID? What is the process for doing this?

2. The only picture I can get through the card is through the VGA or the S-Video ports.

3. I will compare my EDID with yours when I get home tonight - but the MonInfo report (above) was done after I had used your own EDID that you posted, so I would expect them to be identcal.

4. The "AND also" is something I added myself becuase, when using the Toshiba through the VGA port, MonInfo seems to see two monitors - the one on the auxillary port (which, I presume, is the digital EDID being detected through the VGA port) and the Mocrosoft PnP device.

I very much appreciate the assistance. As you can probably tell, I know very little about what I'm doing when it comes to EDIDs and such things.
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Rik Wang
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Posts: 8833


« Reply #14 on: March 30, 2006, 06:31:09 AM »

Quote from: "Miika"
Rik, in the moninfo post it says that the recommended timing is 1280x1024 @ 85Hz. Since the LCD probably can't do 85Hz, could this cause problems?

Yes indeed, but it is not clear whether this is the original EDID or a user-edited EDID. Either way, it is plainly inappropriate.
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