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Thread Tools | Search this Thread | Display Modes |
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09-25-2019, 12:20 AM | #1 |
Junior Member
Join Date: Sep 2019
Posts: 2
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Any HINTS how to debug this? - USB okay, X11 display not... what are the steps???
Can anyone give me hints on how to debug this?
I think it would help me a lot to understand the steps that should be happening between the USB device being recognized (working) for a DisplayLink, and X11 deciding it is a display (only happening to the FIRST USB device). I do not understand how to debug this... so I can't figure out why it is failing. I have two DisplayLinks hooked to Ubuntu. Both are recognized as USB devices, but only one becomes a display for X11 (which ever is plugged in first, even if I change which USB sockets I plug into... it is always the DisplayLink that is plugged in first that becomes a display for X11 - both of them clearly work hardware wise!) Here is a sample of what I see... ls /dev/displaylink/by-id usb-002-003-DisplayLink_Displaylink_USB3.0_Display_PCT13600000 014 usb-002-005-DisplayLink_Displaylink_USB3.0_Display_PCT13600000 014 xrandr --listproviders Providers: number : 2 Provider 0: id: 0x7b cap: 0x9, Source Output, Sink Offload crtcs: 2 outputs: 7 associated providers: 1 name:modesetting Provider 1: id: 0x41 cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated providers: 1 name:modesetting Frankly - I'm not sure how to read that... I have one working monitor (a DELL) and two DisplayLinks via USB. This is a laptop, with a VGA monitor connected, the lid closed. The DisplayLink USB devices definitely both work as monitors - but only one at a time. How can I get X11 to see and use both of them??? Can anyone help me understand the steps that should be happening between the USB device being recognized (working) for a DisplayLink, and X11 deciding it is a display (only happening to the FIRST USB device). Output from the DLSupportTool is available at https://displaylink.org/forum/attach...2&d=1567618658 |
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