Working HDMI? USB GUD driver (OnePlus6T - Fajita)
Hi; very new to this (Linux). This is a liberating effort. You guys are doing god's work!
Someone skilled had gotten a display [HDMI] output on OnePlus6/T working in NixOS mobile using USB GUD driver, with SXMO as an UI:
- NixOS mobile HDMI: OnePlus6/T
- Childhood games on a Linux pocket-computer
- USB GUD in Linux kernel
- Git: GUD
There was an attempt in using my novice troubleshooting to naively replicate this on OnePlus6T Mclaren running pmOS, using pinephone's USB-C dock. Tried it with/out powerbank into dock's power, removing and loading GUD kernel module etc. Attached are dmesg / lsmod for people who actually know their way around.
I don't quite understand: does USB GUD require a Raspberry PI? Sources above don't seem to include it. Does OTG mode need to be enabled [in the kernel] for this to work? Is it likely because of a PinePhone USB-C dock instead of using a legit, powered-one?
Progress on few alternative solutions:
- Miracast - couldn't get it working through [Flatpak] Gnome Network Displays even after reinstalling dependencies.
- DisplayLink (prepare to shell out 200$+ for a bulky dock)
- Use PinePhone with dock to remote-connect to OnePlus6T, and extend it on the external monitor (dynamic resizing IIRC).
- Fast, encrypted RDP doesn't seem to be a thing in Wayland unless one uses Gnome-mobile, or WayPipe (remote display individual applications). FreeRDP didn't work, NoMachine seems to be problematic.
- Last resort seems to be VNC, which might not be optimal (slowly transmits entire image through TCP, insecure/unencrypted by default).
This would be a game-changer in pmOS for powerful [SDM845 SoC] devices!
Particularly, since PinePhone is unusable for browsing with normal browser (Firefox) even on SXMO, and PP Pro's realistic in-heavy-use battery life is in the range of 1-2 hours (with much less powerful hardware). Sadly, using Angelfish doesn't offer an acceptable improvement.
Thank you again for your efforts in developing a free OS liberating users from corporate greed, mass-surveillance, bloatware, and allowing for a truly universal computing platform.
Describe your issue
What's the expected behaviour?
HDMI output through an USB-C dock (hopefully without utilizing 200$+ DisplayPort devices)
What's the current behaviour?
N/A
How to reproduce your issue?
What device are you using?
OnePlus6T (Fajita, McLaren Edition)
On what postmarketOS version did you encounter the issue?
-
edge (
masterbranch) -
v23.06 -
v22.12(Supported until 2023-07-06) -
I confirm that the issue still is present after running
sudo apk upgrade -a
On what environment did you encounter the issue?
Environments
- GNOME Shell on Mobile
- Phosh
- Plasma Mobile
-
Sxmo (Wayland/Sway) Please post the output of
sxmo_version.sh - Other: Please fill out
How did you get postmarketOS image?
- from https://images.postmarketos.org
- I built it using pmbootstrap
- It was preinstalled on my device
What's the build date of the image? (in yyyy-mm-dd format)
2023-09-03
Activity
You are not outputting HDMI directly from a USB-C dock because the phone doesn't have display out wired up. Yes you need a Raspberry Pi (or possibly another SBC) for GUD, that's where the entire magic happens ;)
By Hacker1245 on 2023-10-10T18:20:09
Edited by Administrator-
i think u can use other sbc instead of Raspberry Pi.
By ΞЖKƆ/QVH on 2023-10-10T18:21:20
Edited by Administrator
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Appreciate the response. It seems [pine]phone may work per this nice guide if it'll help anyone.
Strangely, "pmbootstrap kconfig edit linux-postmarketos-allwinner --arch aarch64" fails at unpacking even after zapping, shutting down, cleaning all temp files, and restarting. sdm845 works.
Until then, trying X11 to forward Weston [X]Wayland apps, or a well-configured VNC may be a temporary prosthetic.
By Generic Compiler on 2023-09-06T08:06:57
Edited by Ghost User
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https://wiki.postmarketos.org/wiki/Displaylink
https://www.youtube.com/watch?v=1gXsbBf8S_Y
i am skiled linux user and i can get hdmi out on 6t (via displaylink n dvi to hdmi)
also my displaylink costed me 7usd
By ΞЖKƆ/QVH on 2023-10-10T17:53:51
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sick laptop that is made of 6t
By ΞЖKƆ/QVH on 2023-10-10T17:54:22
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@exkc out of curiosity, which version of gnome/pmOS did you set this up with? the reason is that I'm getting terrible ghosting on gnome 45 with the latest edge. It is super exciting to get some kind of convergence device with a decently performing chip, but wondering if it's my displaylink device/cables or the OS/DE
Update: nvmd, watching your youtube video, it seems you're running kernel 6.4.0-sdm845 and gnome 44.3; not sure why latest 6.5.5-sdm845 and gnome 45.0 is causing the ghosting.
From the Arch wiki, it has to do with the compositor settings. No idea how to adjust this to help reduce or eliminate ghosting. The techniques for restarting the display-manager crashes gdm so the screen stays dark...and applying accessibility>Zoom (scale 1.0) makes movement laggy and choppy. In any case, not sure if this is actually a bug or anything, but since this thread is more of a discussion, doesn't hurt to highlight that the method works, albeit still buggy and not exactly ideal.
By dhcbdev on 2023-10-31T21:29:38
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yes it is buggy.
hack wlroot hate dual screen with udl and other gpu
I has some issue with gnome 44.3 (small graphics glitch (as i remember there was no ghosting.) with kernel 6.4.0.
For some reason, those graphics glitch wont appear in gaming.
I cant test it now with gnome 45 and 6.4.0 (partly due to my mental illness as well as some shit happented in life)
By ΞЖKƆ/QVH on 2023-11-01T12:19:52
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@exkc -- forgot to ask, did you run gnome in Xorg or with Wayland? I've only run it in Wayland, could explain the ghosting...
nvmd -- i'm assuming wayland since that's the only option pmos provides
By dhcbdev on 2023-11-01T22:57:48
Edited by Administrator -
@exkc perhaps you can share more details regarding the peripherals/other configurations you might have tweaked for your setup to work as well as it did (e.g. packages, other kernel options, drivers, if any).
I've tested this with a the HP DisplayLink with the Shift6mq and can confirm that ghosting is still there. I had originally thought it could have been my OP6t, but now can say that it might be something else. I had also tested this same thing with my PPP and it works much better, but is buddy (could be due to the fact that the PPP has DP-Alt so the second screen with the Displaylink kept staying in task switcher mode...)
@genericcompiler -- if you end up trying this setup as you originally wanted with this issue, please let me know if you encounter similar issues.
As for the moderators, this issue probably has devolved into a discussion thread meant for some forums, but now I think I'm raising an possible issue with the firmware/kernel/etc? Let me know if we should close and open a new issue more focused on perhaps resolving the issue OR if this is out of scope for this project.
By dhcbdev on 2023-11-07T16:41:54
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my sdm845 kernel https://gitlab.com/exkc/pmaports/-/tree/sdm845_custom?ref_type=heads
By ΞЖKƆ/QVH on 2023-11-08T12:10:16
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@dhcbdev I'd love to; but due to my carelessness, and recent security compromises, I've accidentally locked the bootloader on DivestOS. Developer options don't list OEM unlocking at all, and emergency EDL doesn't work. Can only confirm that DisplayLink works on divestOS without any ghosting.
By Generic Compiler on 2023-11-08T20:20:22
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Ok -- so this adjustment seemed to fix whatever was ailing my particular setup: https://askubuntu.com/questions/723683/mouse-cursor-leaving-trails-artifacts
Adding
CLUTTER_PAINT=disable-clipped-redraws:disable-cullingto/etc/environmentresolved my particular issue with mouse trails. Unsure exactly why this was happening to my setup vs @exkc's but hopefully this might help others attempting this setup (writing this post on device over monitor).Now I'm off enjoying my slight improved productivity boost
By dhcbdev on 2023-11-09T04:52:33
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Btw pm os can run on rotuer now. Also Ethernet dont work so i use usb lan card https://wiki.postmarketos.org/wiki/Linksys_EA9350_V3_(linksys-jamaica)
By ΞЖKƆ/QVH on 2023-12-06T17:09:39
Edited by Administrator
added discussion label
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Nice! Happy to be proven wrong, even though I didn't manage to find legit DisplayLink for that price, it was acceptable. This seems like the most optimal solution without involving another computing device.
So the OP6 OTG (host-mode) instructions with a hub should do the trick. I presume UDL DisplayLink should work for other pmOS "Android" devices using similar process.
By Generic Compiler on 2023-10-22T15:02:21
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if you don't mind tinkering with the driver, https://wiki.postmarketos.org/wiki/FL2000 and https://wiki.postmarketos.org/wiki/MS9132/MS912x also are really good option at affordable price.
By ΞЖKƆ/QVH on 2023-10-22T15:02:51
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tbh other usb 2 displaylink certified displaylink might work with udl i think
(the only known working one(HP NL571AA) is displaylink certified so maybe other displaylink certified one will work?)
plugable usb2 displaylink might work too i think since they have contributed to the driver i think (see https://www.youtube.com/watch?v=O2OCKRh-3ko description)
By ΞЖKƆ/QVH on 2023-11-01T12:45:15
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@exkc take it easy, you'll grow stronger :) . Brilliant idea/find; seems like a solution.
@dhcbdev This USB to DVI/VGA/HDMI seemed like the cheapest solution within EU on glance. The adapter works on Android device through DisplayLink app.
By Generic Compiler on 2023-11-02T13:59:58
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@dhcbdev This USB to DVI/VGA/HDMI seemed like the cheapest solution within EU on glance. The adapter works on Android device through DisplayLink app.
oh that one is a displaylink certified usb 2 displaylink
btw there are some displaylink certified usb 2 displaylink can support up to 2048 x 1152.
@exkc take it easy, you'll grow stronger :) . Brilliant idea/find; seems like a solution.
Maybe i will learn reverse engineering and make linux driver for when i grow so i can reverse engineering FL2000 and MS9132/MS912x (i have a usb FL2000 gpu i bought it bc i thought it is displaylink gpu (but it is not ;-;))
By ΞЖKƆ/QVH on 2023-11-02T14:51:26
Edited by Administrator -
ah btw that usb 2 displaylink dont support hdmi they only support dvi-i which support analog signal and TMDS signal so u can convert that to vga /hdmi via passive adaptor (hdmi and dvi are using TMDS signal btw) . Those converted hdmi from displaylink cant carry aduio so you need to a hdmi to dvi
adaptor that have separate audio in (those adaptor is quite costly) and a usb aduio sound to get aduio out to the monitor . (you may not need a usb aduio sound bc typec has way to drectly out put aduio via type c (not sure how that will work in linux))By ΞЖKƆ/QVH on 2023-11-02T15:09:28