#StackBounty: #multiple-monitors #display #thunderbolt External Monitiors via TB3 Only Occasionally Work, Ubuntu 18.04

Bounty: 50

My work computer setup was recently upgraded with a Thunder Bolt 3 docking station. I’m running Ubuntu 18.04. It connects via a USB-C port on my computer. When I plug it in, the external keyboard and mouse always works, but 80% of the time the external monitors do not work. My computer detects them via the TB3 but the monitors just say no signal detected. At the moment, to get it working I spend 5 minutes turning the monitors on and off and re plugging in the USB-C cable from the TB3. It eventually works but I’m wasting a lot of time every day because I have to repeat it every time I return to my office. Any ideas?

The graphics card is an Intel UHD Graphics. My xrandr input is the same whether the monitors detect my computer or not and is here

eDP-1 connected primary 1920x1080+3968+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1920x1080     59.99*+  59.97    59.96    48.01    59.93  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-1-1 connected 1920x1080+2048+0 (normal left inverted right x axis y axis) 598mm x 336mm
   1920x1080     60.00*+
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 connected 2048x1152+0+0 (normal left inverted right x axis y axis) 255mm x 255mm
   2048x1152     60.00*+
   3840x2160     29.56  
   2560x1440     59.95  
   2048x1280     59.92  
   1920x1200     59.88  
   1920x1080     60.00    60.00    50.00    59.94    24.00    23.98  
   1600x1200     60.00  
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  

Any ideas? Thank you for your time. Since it works occasionally it seems like there must be something I can do


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#StackBounty: #multiple-monitors #hdmi #displayport #thunderbolt Active/Passive Thunderbolt 3 to HDMI

Bounty: 150

I have a 2019 MacBook Pro 16" that has four thunderbolt 3 ports. Currently I have three cheap-o USB C to HDMI adapters that work well, but I feel like there is a drag on my system resources.

My question: is there an adapter that is preferred to allow the native Thunderbolt -> HDMI to pass through? I am fairly certain that those $20 dongles from Amazon are using the CPU in order to do the display output (are these considered active?).

According to the Thunderbolt website https://thunderbolttechnology.net/tech/faq, Thunderbolt natively supports Display Port. If I were to get a passive Thunderbolt 3 cable to Display Port, then get a DisplayPort to HDMI converter (my monitor doesn’t have Display Port) would this work without taxing the CPU?

Thanks in advance!


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#StackBounty: #lenovo-laptop #thunderbolt #lg-monitor how to make lg ultra fine monitor to work with windows?

Bounty: 50

Recently purchased LG ultra fine monitor LG ultra fine monitor

Wanted to make it work with my existing windows laptop which has type-c connector. When connected It identifies the monitor, but the monitor is just blank.

Only resource I found was from reddit which has no solution.

How would I make it work with my existing laptop ? It would be annoying to have multiple monitors for each laptop 🙁

Laptop I am using for connection is : Lenovo think pad A275. It has Usb type C port but it is not thunderbolt.


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#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!

#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!

#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!

#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!

#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!

#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!

#StackBounty: #displayport #thunderbolt What's the compatibility story for DisplayPort 1.4 and Thunderbolt 3.0?

Bounty: 200

Intel Titan Ridge controllers (and if I gather correctly, Ice Lake CPUs) are DisplayPort 1.4 and TB3 compatible (Intel Ark).

I understand very well how this works in DisplayPort Alternate Mode: the host is told to switch into this alternate mode and from that point on, the cable is basically a DisplayPort cable with a different connector. If we have a laptop with a DisplayPort 1.4 capable GPU and Titan Ridge and a 3440×1440 @ 144 Hz monitor (which requires more DP bandwidth than DP 1.2 has) I would expect every USB C dock / adapter with a DisplayPort output to just work because all the dock needs to do is blindly connect the lanes in the USB C connection carrying DisplayPort signals to the DisplayPort outputs.

I can’t wrap my head around the Thunderbolt story, however. What’s the compatibility expectation here? Let’s take an Alpine Ridge based dock which is the majority of the market currently. Do we expect the monitor to work at full resolution and frequency if plugged into a DisplayPort port on the dock? If monitor has a USB C input but not Thunderbolt input, would plugging that into the downstream port of the dock work? My understanding is the TB3 standard requires the downstream ports to work in DP alt mode (this answer corroborates) but I do not know about the DP version here. How much does the TB3 controller dock “interpret” and how much does it slavishly copy?


Get this bounty!!!