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simplycorbett
n00b
Joined: 14 Mar 2024
Posts: 27
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 Posted: Thu Mar 14, 2024 3:48 am Post subject: Thunderbolt monitor with uneven line down middle |
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My thunderbolt monitor on Gentoo has a line going down the middle where half of the open GUI application is lower then the other half.
For those who don't know thunderbolt carries two display port signals and the screen outputs each display port signal on one half.
This is happening on both xorg and wayland, currently on wayland. Any suggestions on how to fix this?
This doesn't happen on windows. |
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kgdrenefort
Guru
Joined: 19 Sep 2023
Posts: 312
Location: Somewhere in the 77
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| Posted: Thu Mar 14, 2024 9:21 am Post subject: |
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Hello,
1/ What is your GPU ? Have you one or two maybe ?
Please run as root:
2/ What is the driver used aside this GPU ?
3/ Could you, maybe help us a bit more to understand, upload a picture of that weird behavior ? Curious also, not quite sure to fully imagine a problem behind «there is a line».
Regards,
GASPARD DE RENEFORT Kévin
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szatox
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Joined: 27 Aug 2013
Posts: 3430
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| Posted: Thu Mar 14, 2024 12:47 pm Post subject: |
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| Quote: | | For those who don't know thunderbolt carries two display port signals and the screen outputs each display port signal on one half. |
I know that DP allows daisy-chaining displays, so it makes sense for TB, which interleaves USB, DP and PCIe on a single connector to _allow_ carrying 2 signals, but I also think you should have an option to only output one.
In fact, I've been using a 4k monitor connected over DP to a USB-C dock station, and I'm pretty sure xorg reported the whole monitor as single display, so why does your system see 2 independent halves?
Is it some setting in the monitor itself? I know some (bigger/high res) monitor can accept multiple inputs at the same time. Can you fix it by just switching this option off?
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simplycorbett
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Joined: 14 Mar 2024
Posts: 27
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| Posted: Thu Mar 14, 2024 1:06 pm Post subject: |
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| szatox wrote: | | In fact, I've been using a 4k monitor connected over DP to a USB-C dock station, and I'm pretty sure xorg reported the whole monitor as single display, so why does your system see 2 independent halves? |
Because there are two independent halves on the monitor. It's how this monitor was designed - the resolution is higher then 4k. |
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simplycorbett
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Joined: 14 Mar 2024
Posts: 27
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| Posted: Thu Mar 14, 2024 1:13 pm Post subject: |
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| kgdrenefort wrote: | Hello,
1/ What is your GPU ? Have you one or two maybe ?
Please run as root:
2/ What is the driver used aside this GPU ? |
Hi,
It's not letting me copy and paste from terminal for some reason but it's only one GPU on 01:00.0 with a nvidia TU104M 2070 super mobile / max-Q rev a1. The driver version is 550.54.14.
The problem is that there are two display outputs on one monitor and its not syncing correctly in the middle.
If I reset the display configuration to default the problem goes away, so it seems to be related to modifying the display configuration in settings. However, when scrolling down on the screen there is a jarring disconnect between the two sides of the monitor before everything catches up in sync. |
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simplycorbett
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Joined: 14 Mar 2024
Posts: 27
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| Posted: Thu Mar 14, 2024 2:17 pm Post subject: |
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Actually the issue comes back on system restarts, so its not just the display configuration editor.
https://i.imgur.com/BNXOseT.jpeg |
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logrusx
Advocate
Joined: 22 Feb 2018
Posts: 2419
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| Posted: Fri Mar 15, 2024 6:05 am Post subject: |
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Try with a different display manager. If the issue persists, consider requesting the thread to be moved to Kernel & Hardware. You can do that by reporting your first post and fill in the request as a reason for the report.
Best Regards,
Georgi |
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Banana
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Joined: 21 May 2004
Posts: 1729
Location: Germany
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logrusx
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Joined: 22 Feb 2018
Posts: 2419
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| Posted: Fri Mar 15, 2024 7:47 am Post subject: |
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| Banana wrote: | A hardware defect is already ruled out?
Tried it with another source laptop/PC? |
| simplycorbett wrote: |
This doesn't happen on windows. |
Also it doesn't look like hardware defect, more like a driver problem.
Best Regards,
Georgi |
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