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VGA Port Edid patch for mojave? (T440p)

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ameeno
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VGA Port Edid patch for mojave? (T440p)

#1 Post by ameeno » Mon Mar 04, 2019 4:32 pm

Hello Thinkpadders!

I Have a t440p with Mojave/Win10.

the vga port for external displays does not work.

Do you know how i might get it working? My previous laptop the Dell e7440 had HDMI Out + Mini DP so i could comfortably use 3 Screens (laptop + 2 external)

I have read some guides focussed on the x220 Model which has VGA output with an EDID patch, And i wondered if this can be done in Mojave with an i7 - 4712MQ processor.


Basically I have switched to this laptop to get a better CPU, but the VGA not working is a huge blow after using 3 screens previously.

Could a custom EDID patch work to get the VGA port working???

Thanks in advance.

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Re: VGA Port Edid patch for mojave? (T440p)

#2 Post by RealBlackStuff » Tue Mar 05, 2019 4:40 am

Under W10 apparently Hyper-V can cause trouble, but I don't know if that also applies to mojave.
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Re: VGA Port Edid patch for mojave? (T440p)

#3 Post by dr_st » Tue Mar 05, 2019 4:53 am

No patch should be needed to get a VGA port working.

What is your exact display configuration?

Is the laptop docked?

Does the VGA port work before OS boot, in BIOS for example?
Thinkpad 25 (20K7), X1 Carbon (20HQ), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

ameeno
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Re: VGA Port Edid patch for mojave? (T440p)

#4 Post by ameeno » Tue Mar 05, 2019 5:41 am

Laptop not docked.

VGA does not work (Using whatevergreen) can only output to LCD and mini DPI.


i would like Minidpi + VGA + Lcd.
No dock involved.


I was told on other forums that macs dont support VGA, but it seems that they supported vga in the past.

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Re: VGA Port Edid patch for mojave? (T440p)

#5 Post by dr_st » Tue Mar 05, 2019 5:54 am

Dunno about Mac, but Windows certainly should support 3 displays on a T440p.

Is it a problem with number of displays or specifically with VGA? For example can you run VGA output only (LCD off and no miniDP)?

In a triple display configuration, does Windows at least detect the third display or is it like there is no VGA cable?
Thinkpad 25 (20K7), X1 Carbon (20HQ), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

ameeno
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Re: VGA Port Edid patch for mojave? (T440p)

#6 Post by ameeno » Tue Mar 05, 2019 6:13 am

it works on Linux and windows, but not MacOSX :(

trying to get it to work on mac, hence the post in *THIS* board

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Re: VGA Port Edid patch for mojave? (T440p)

#7 Post by dr_st » Tue Mar 05, 2019 6:59 am

ameeno wrote:
Tue Mar 05, 2019 6:13 am
it works on Linux and windows, but not MacOSX :(

trying to get it to work on mac, hence the post in *THIS* board
Sorry, it wasn't clear from your first post. You did say Mojave in the title, but mentioned Win10, and it wasn't clear to me until now that it works in Windows, but not in Mojave; this is indeed very likely to be something Mac-specific that is beyond my knowledge. :(

P.S. Many people, yours truly included don't browse by forums, but by 'recent posts'; I often don't pay attention which forum a post is in. :??:
Thinkpad 25 (20K7), X1 Carbon (20HQ), Yoga 14 (20FY), T430s (IPS FHD + Classic Keyboard), X220 4291-4BG
X61 7673-V2V, T60 2007-QPG, T42 2373-F7G, X32 (IPS Screen), A31p w/ Ultrabay Numpad, A21m 2628-GXU

ameeno
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Re: VGA Port Edid patch for mojave? (T440p)

#8 Post by ameeno » Tue Mar 05, 2019 3:14 pm

:)

Understood, Yea linux + Win10 works but on osx i cannot get the vga to work and i dunno how.

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Re: VGA Port Edid patch for mojave? (T440p)

#9 Post by axur-delmeria » Tue Mar 05, 2019 3:48 pm

Do Macs still have a VGA port? Is it possible that OS support simply does not exist?
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Re: VGA Port Edid patch for mojave? (T440p)

#10 Post by Thinkpad4by3 » Tue Mar 05, 2019 4:04 pm

axur-delmeria wrote:
Tue Mar 05, 2019 3:48 pm
Do Macs still have a VGA port? Is it possible that OS support simply does not exist?
Apple did have VGA but I believe it was through a Mini-VGA port and it had a short run of ~2000 -> ~2005. This shouldn't stop the VGA port from working in theory, as any graphics card in a Mac Pro tower machine with a VGA card would have to be supported. If the graphics card works, there is no reason the VGA port can't work like any other output.
Thinkpad4by3's Law of the Universe.

The efficiency of two screens equally sized with equal numbers if pixels are equal. The time spent by a 4:3 user complaining about 16:9 is proportional to the inefficiency working with a 16:9 display, therefore the amount of useful work extracted is equal.

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Re: VGA Port Edid patch for mojave? (T440p)

#11 Post by ameeno » Wed Apr 17, 2019 5:29 am

I have been told by lots of people on hackintosh forums that VGA is not compatible with Modern macOS.


What apple seems to do is if the machine is too old, it will not allow you to update to the latest mac.

SO the latest MacOS Versions can only go on hardware that does not have VGA.

Basically, Mini Dp to vga works, but VGA -> VGA not working :(

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