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Member Since 04 Jul 2008
Offline Last Active Dec 11 2015 05:15 PM

Posts I've Made

In Topic: Intel HD4600 banding/gradient/16-bit colors issue Y510p

24 June 2015 - 03:33 PM

Nope. It is not the same. What you did is setting the display off/on and this does not replicate the small issue I mentioned. Use screensaver (and not just preview it, USE it).


How can I tell that the gradients are back? After I interrupt the screensaver, the background is grey (before I could tell because the wallpaper's blur had banding in it).

In Topic: Intel HD4600 banding/gradient/16-bit colors issue Y510p

24 June 2015 - 03:17 PM

Guys .. I have some not good news .. the gradients can still appear even after using the custom EDID!


This is not a major issue and can be ignored altogether but I thought to share it here. Using the custom EDID helped a lot to get rid of the colour gradients that used to appear after display off/on. However, I found that certain procedure can still reproduce the gradients in limited way:

  1. Make sure "Require Password" is enabled in System Preferences > Security & Privacy > General
  2. Set the timing to anything, "immediately" for example
  3. Allow the system to run screensaver
  4. Cancel the screensaver and password will be required
  5. Gradients are visible on the login screen

That said, once I log in the gradients disappear so it is not a major issue as I said before.


This is the same as using a screen corner to trigger the login screen, right? I have it set up like you do, with 'Require Password' set to immediate. When I trigger the screen-off state via that corner, I don't see the gradients on the login screen.

In Topic: Intel HD4600 banding/gradient/16-bit colors issue Y510p

07 June 2015 - 12:39 AM

Success! Injecting the EDID above worked :) Thanks for all the work involved, everyone!

In Topic: Intel HD4600 banding/gradient/16-bit colors issue Y510p

07 June 2015 - 12:03 AM

Everything appears in order ...


What did you use to convert the data to base64?


Edit: Used this (http://base64converter.com/) on the .bin file, got this. Booting into OS X to make config.plist edits...


In Topic: Intel HD4600 banding/gradient/16-bit colors issue Y510p

06 June 2015 - 11:57 PM

Just for your information, when you connect your laptop to external display there will be an entry for each display you connect to.


Now to your case, I'm not sure you should have Extensions at all not to mention an error in them. EDID versions 1.3 and 1.4 are 128-byte structures and you can notice that if you looked at the Hex Editor and multiplied the number of rows from 00:07 by the number of columns from 0:F which is 8*16=128. This means the last row is the 8th row (row number 07) and nothing beyond that. The software you are using allow adding Extensions so the final matrix is 256-bit and it is called Enhanced EDID (E-EDID).


Are you sure you did not press the "Add CEA Timing Extension"? If not, you should ignore/remove the rows from 08 to 0F while you are editing your EDID. 


I'm pretty sure I've made changes correctly but to be sure, here they are: https://i.imgur.com/UBm51Nw.png


Steps performed:

  • Extract EDID from registry
  • Switch to EDID 1.4
  • Open Hexa Editor
  • Change first basic parameter from 80 to 90
  • Close it, Deltacast EDID will prompt for checksum fix, hit OK
  • Done
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