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[T430s] HD4000 + dock 4337 can't display triple monitors

T430 and later, plus T530 and later series specific matters only
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whqdz
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[T430s] HD4000 + dock 4337 can't display triple monitors

#1 Post by whqdz » Tue May 21, 2019 7:35 am

Hello :)

I'm trying to connect 2 monitors to my dock (displayport + vga) with a t430s but no success, I can't display both at the same time (+ built-in). The laptop doesn't have nvidia discrete GPU.

It looks like it's only possible to display two monitors, even if intel hd 4000 can support up to three monitors.

Does anybody know if there is a way to fix this?

Thank you.

dr_st
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Re: [T430s] HD4000 + dock 4337 can't display triple monitors

#2 Post by dr_st » Tue May 21, 2019 1:17 pm

Strange. DisplayPort + VGA + Internal should work.

Which OS? Which driver? Maybe it needs to be updated?
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

whqdz
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Re: [T430s] HD4000 + dock 4337 can't display triple monitors

#3 Post by whqdz » Wed May 22, 2019 2:54 am

I tried different combinations while both screens are connected to the dock :

- built-in + DisplayPort : OK
- Built-in + VGA : OK
- DisplayPort + VGA : KO
- Built-in + DisplayPort + VGA = KO
- Only DisplayPort : OK
- Only VGA : OK
- Only built-in : OK

Software side:
- I'm running Arch 2019.05.02, I also tried from a Ubuntu 18.04 live cd but still facing the same issue.
- I installed dockd and re-installed acpi in order to try, no success.
- xrandr doesn't want to display 3 monitors at the same time.
- Tried the same with arandr

The VGA (or DisplayPort, depends which one I use as second) stays with "no-signal". What is very weird is that "xrandr" output shows the two external minitors with their framerate and resolutions, but the laptop can't handle signal to both at the same time.

Whitieiii
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Re: [T430s] HD4000 + dock 4337 can't display triple monitors

#4 Post by Whitieiii » Fri May 31, 2019 3:57 pm

No it can only handle
vga+internal or
displayport+internal or displayport+displayport+internal (via docking station) on Intel graphics machines

Just need the dock with 2 displayports to be able to output to two monitors and the built in screen at the same time....

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dr_st
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Re: [T430s] HD4000 + dock 4337 can't display triple monitors

#5 Post by dr_st » Sat Jun 01, 2019 12:31 am

The exact limitation is that 2 of the 3 displays must be DP displays, because there are only 2 PLLs in the chipset, and only DP displays can share a PLL.

A small exception is that if the two external monitors are exactly the same resolution and refresh rate, then you can get it to work even if one (or both) of them is DVI, however I could never get it to work under Windows, only Linux. And I never tried DP+VGA+internal.

More info here:
viewtopic.php?t=123257#p797092
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

whqdz
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Posts: 75
Joined: Sat Sep 09, 2017 12:42 pm
Location: Belgium, Brussels

Re: [T430s] HD4000 + dock 4337 can't display triple monitors

#6 Post by whqdz » Sun Jun 02, 2019 9:04 am

Thank you really much Whitieiii and dr_st. I've seen a post where the OP was talking about 2x DP or 1x passive DP + DVI but I was not able to find it again. You gave me all informations I needed :)

I'm gonna give a try to a passive DP++ to DVI dongle on the 4337 Dock and once the work has been done I'll keep some news here.

Thank you again

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