@l_i_l
If your new panel's EEPROM is not write protected, you can just rewrite the new panel EDID. No need hardware equipment, it can be done just with a software like
edid-rw.
I had tried the override inf and registry method, including installing latest intel graphic driver from intel, but no avail.
---
Eventually I managed to solve the issue by rewriting the panel's EDID with edid-rw (luckily my panel's eeprom is not write protected).
Here is the how-to if anyone interested:
1) You will need linux OS (ubuntu or linux mint for example). If you don't have one in your machine, you can create bootable linux usb flash drive with
Rufus or similar tools.
2) Boot up into the linux, follow the "Installation" part from
https://github.com/bulletmark/edid-rw
3) You will need to find out the panel bus number first. You can do this with command:
Code:
$ sudo ./edid-rw 0 | edid-decode
where the number 0 is the bus number you want to check.
If you got result like this:
Code:
Extracted contents:
header: 00 ff ff ff ff ff ff 00
serial number: 30 e4 45 03 00 00 00 00 00 15
version: 01 04
basic params: 90 16 0e 78 02
chroma info: e8 87 96 5a 55 95 28 22 51 55
established: 00 00 00
standard: 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01 01
descriptor 1: 4c 1d 00 ec 50 20 18 30 40 30 57 00 d9 88 00 00 00 1b
descriptor 2: 16 12 00 80 50 20 16 30 30 20 47 00 d9 88 00 00 00 1b
descriptor 3: 00 00 00 fe 00 43 33 47 52 4e 80 31 30 31 57 58 31 0a
descriptor 4: 00 00 00 00 00 00 41 32 a8 00 00 00 00 01 01 0a 20 20
extensions: 00
checksum: 9a
Manufacturer: LGD Model 345 Serial Number 0
Made week 0 of 2011
EDID version: 1.4
...
then you got the panel bus number. If not, retry by increasing the bus number until you got the number:
Code:
$ sudo ./edid-rw 1 | edid-decode
$ sudo ./edid-rw 2 | edid-decode
$ sudo ./edid-rw 3 | edid-decode
...
In my T450s, the display bus number is 4 (it might vary between machine)
Note: finding correct bus number is very important. Writing EDID to wrong bus number could destroy other connected hardware on your laptop.
4) Download the whitelist EDID dump from here (thanks to
@t456 for the download links):
http://forum.notebookreview.com/thr...tness-set-at-max.774101/page-22#post-10271974
EDID dump of thinkpad X250 FHD IPS panel (LEN40E4 - LP125WF2-SPB2)
Use the EDID dump file that closely match with your new panel's brand, e.g. if your machine is T450s and the new panel is AUO FHD panel then use "LEN40A3 - B140HAN01.2.bin" or "LEN40A3 - B140HAN01.3.bin", if it's LG FHD panel then use "LEN40A3 - LP140WF3-SPD1.bin". You can rename the dump file into "new_edid.bin".
-----
Alternatively you can dump the original panel's EDID and rewrite the new panel's EDID with the original panel's EDID. It's only recommended to do this if your original panel and replacement panel has same display resolution & brand, and you haven't swapped the original panel, otherwise just uses the EDID dump file above.
If you want to dump the original panel's EDID, run this command with your original panel installed:
Code:
$ sudo ./edid-rw 4 >original_edid.bin
(where 4 is the bus number you find from step 3, it might be different in your case)
Save that original_edid.bin somewhere.
5) Next, you might want to dump the new panel's EDID for backup. With your new panel had been installed, run this command:
Code:
$ sudo ./edid-rw 4 >new_panel_edid_backup.bin
(where 4 is the bus number you find from step 3, it might be different in your case)
6) When you're ready, run the command below to rewrite the new panel's EDID to display bus 4 (double check your bus number first before running the command!):
Code:
$ sudo ./edid-rw -w 4 <new_edid.bin
or in case you want to rewrite it with the original EDID dump:
Code:
$ sudo ./edid-rw -w 4 <original_edid.bin
7) Run
Code:
$ sudo ./edid-rw 4 | edid-decode
to check if the EDID is successfully written. If you don't see any change on the EDID data, then it means your new panel's eeprom is write-protected.
Problems? See this thread at archive.org.
![[IMG]](images/storyImages/04e99f3cd3101aebfa9acc37ea71d64e.jpg)
![[IMG]](images/storyImages/af3cbe3732eafe691fc55dd5c8046ee2.jpg)
![[IMG]](images/storyImages/31bacb9708aa517a87b7647e01addc83.jpg)
![[IMG]](images/storyImages/9de947072a086fd1616b9c808607902b.jpg)
