Did you ever try/consider something like this. Displayport to multiple HDMI out? https://www.amazon.com/StarTech-com-DisplayPort-HDMI-Multi-Monitor-Splitter/dp/B015J8Q6ZK (many options here. not al lare create even remotely equal...) And the active DP->HDMI costs have come way down. (This may be what you need for it all to play nice) https://www.amazon.com/dp/B07D2HSH4D/ On Mon, Aug 24, 2020 at 7:23 AM Michael Butash via PLUG-discuss < plug-discuss@lists.phxlinux.org> wrote: > others cheap geeks wanting to use a big tv too> > > You're right, the ports on the dock are DP1.2, but the TV is HDMI2.0, so > using an all-in-1 DP-to-HDMI cable, presumably the dongle chip built into > it, but hopefully better being "built in" together than a separate > DP-to-HDMI dongle+cable. > > Even using matched dongles and cables had recurring issues, similar to > Linus Tech Tips on youtube using an 8k TV, that required literally 4x HDMI > connections to use the 8k setup, and none would sync with each other. > Using a combo DP-to-HDMI cable resolved this (provided by the TV vendor of > course), but dongle+cable was a no-go. > > I've done a fair amount of diag watching the display churn during > power-down, no signal, etc and per xrandr it's typically showing the > correct display modes, and presence of the display (while in power down, > but os seems to know it's not active to use it). KDE, which when it isn't > infuriating me, tends to be what I use, and it just always does a horrible > job of shifting windows, display settings, refresh/resolution, etc during > these transitions of all/some displays at once. It's not only KDE though, > Cinnamon, Mate do it too, seems a systemic issue outside the DE. Plus it > happens with either Intel or Nvidia, so that leaves me staring at the > kernel, or xorg itself being quirky. > > I think you're right with a static edid and a device to do it, I've > considered this in the past with some of the magic video adapters that do > this for various odd devices, but were expensive for adapters when I need > 2-3 of them (they were over $100ea last I looked). These little single > shot static units might work if I can find one for HDMI-to-HDMI. > > However my fear is the problem is more with the DP to HDMI chip that is > translating, either in a dongle or built into a cable, which I think is > where things get flaky (since I have to still "reboot" them occasionally > with a cable pull. If that is glitching, I don't think a static edid > adapter would even help at the hdmi end as I think the issue is more at the > DP and adapter side. > > Native HDMi ports would probably work, but no one makes a multi-HDMI card > or dock I've found, at least not for 4k/60 x2 or 3 displays. The docks I > did find were typically DisplayLink chip-based docks, which make crappy > usb-to-video chips with dubious linux driver support, particularly anything > not already 3-4 years old. DisplayLink has always been Linux-unfriendly, > and just not something I'll bother with. > > Nothing is ever perfect.... > > -mb > > > On Mon, Aug 24, 2020 at 4:48 AM Brian Cluff wrote: > >> If all your connections all end up plugging into the HDMI port of the >> TV. You should be able to just plug the EDID device directly into the TV >> and your HDMI cable into it and it should solve all your problems... Unless >> I've missunderstood and you have found some TVs with displayport >> connections on them. >> >> Brian >> >> On 8/23/20 7:00 PM, Michael Butash wrote: >> >> That looks pretty cool, but my dock is 1x TB3 in, and 2x DP1.2 out on >> there, so really the problem is adapting DP1.2 to HDMI there to 2 of the >> displays. My third display mostly sees playstation activities these days >> until I screw around with my failed desktop, but still use 2x TV's with my >> built-in 4k laptop display as 3rd. >> >> I used to use a separate hdmi cable and a DP-to-HDMI adapter, but >> randomly saw someone else having issues with them (particularly with 8k >> displays muxing across them), then got an integrated DP-to-HDMI cable I had >> better hope for (could not find his exact brand). It's a bit better, but >> still occasionally requires reseating. I suspect this is a bug in the >> hardware/firmware on the adapter soc, but who knows. >> >> Maybe what I need is one of those adapters for more hdmi-to-hdmi at the >> tv end, or DP-to-DP for the same at the dock end. I'll look around see if >> something like what you sent me. >> >> Appreciate you look around on this for me, I have really odd issues no >> one ever else much seems to. Perhaps self-inflicted gunshot wounds, but I >> like to think I'm pushing boundaries. ;) >> >> -mb >> >> >> On Sat, Aug 22, 2020 at 10:41 AM Brian Cluff wrote: >> >>> I think I've found the solution to your display problems, you just need >>> to buy a 3 pack of these (relatively inexpensive): >>> >>> https://www.amazon.com/FUERAN-stabilizer-Thunderbolt-fit-Headless-4k-3840x2160/dp/B07ZYLGDK3 >>> >>> Just read the reviews. It sounds like it solves your exact problem. >>> The reviews also say that it can be used with a displayport to HDMI adapter >>> unlike what the product description says. The product has a lot of >>> chinglish in it so I think what they mean is that it's not a displayport to >>> hdmi adapter. >>> https://www.amazon.com/product-reviews/B07ZYLGDK3/ref=acr_dp_hist_5 >>> >>> It appears you need to purchase the correct device for the resolution >>> you want to run and then once plugged in it just tells the system that >>> there is a display connect all the time, even if it's turned off or there >>> isn't one plugged in at all. This is the device that I was mistakenly >>> calling a DPMS proxy in my previous message. I had forgotten that it's >>> actually an EDID proxy, and they are a lot cheaper than when I was trying >>> to solve my similar problems in the past. >>> >>> I hope this helps... >>> >>> Brian Cluff >>> >>> >>> >>> On 8/22/20 8:30 AM, Michael Butash wrote: >>> >>> All valid points and correct Brian, cost vs. function. ~3yr ago when I >>> bought these displays, I was moving from 6x 24" ancient dell lcd's, and got >>> a "good" deal on these for about $650ea, curved samsung 48" 4k/60 >>> displays. Couldn't get close to that with a real large monitor, let alone >>> curved (great for my desk) and in fact really couldn't find any period >>> except some off-brand chinese ones I expect to last no more than a year. >>> >>> I'd purchased a CEC injector to play with, but kind of a pain to run and >>> sync 3 of them at once, plus ~$50ea. Was going to try a rs232 adapter on a >>> quad serial adapter, but eventually realized I can live with shutting off >>> the displays manually via good old remote. >>> >>> The problem comes in doing so, you can't really catch and power-down all >>> at once, which causes video subsystem to start resizing from 3 displays, to >>> 2, to 1, then none, which pretty much freaks out KDE and other DE's. KDE >>> has been notoriously horrible about multi-monitor support over the years, >>> window placement/size preservation, random resolution setting resets, >>> things like that. Now add in some dongles that randomly require a physical >>> disconnect to resume proper function randomly, every day, sometimes >>> multiple times a day if I have power management shutting down displays, and >>> it gets infuriating rather quickly. This was on my desktop with a >>> dedicated video card even! >>> >>> Now I'm using my laptop and the TB3 dock, which I find if I simply walk >>> up and yank the dock TB3 connector, so all external displays drop at once, >>> then power them down, they actually work fairly normally. I have to >>> disable power down of displays, but since the tv's won't shut off entirely >>> anyways, isn't that big a deal, other than the constant heat these generate >>> and my failing old AC in the house. >>> >>> I'm a bit more surprised HDMI still this day doesn't support DPMS-type >>> functions to some extent, even if "legacy" vs. only CEC. Likewise I'm >>> surprised companies like samsung don't just include a DP port on their TV's >>> too, as it's more common to see folks like yourself and I using TV's as >>> displays, as most tv's are better quality and price than any available >>> "computer monitor" unless you need/want 144mhz gaming refreshes (that your >>> eyeballs can't see anyways). >>> >>> I figure at some point a developer might buy a few of these tv's and >>> realize how asinine this all is to use to resolve it, but considering here >>> we are in 2020 and my first reports of some of this stuff began a decade or >>> more ago, perhaps not. KDE is still working on trying to fix window >>> placement a decade or two on, seeing this just today... >>> >>> >>> -mb >>> >>> >>> On Fri, Aug 21, 2020 at 10:16 PM Brian Cluff via PLUG-discuss < >>> plug-discuss@lists.phxlinux.org> wrote: >>> >>>> The problem with your setup is that you're using TVs for multiple >>>> displays. Like you said, TV's don't understand DPMS so it's impossible to >>>> get them to power down on command. Most newer TVs do understand CEC and >>>> it's possible to get a CEC injector (I believe NVIDIA doesn't handle it in >>>> their cards) to send a signal for the TV to power itself off/on when you >>>> want it to. The biggest problem is that when TVs turn off, they stop,for >>>> the most part, reporting on the cable that they are there, so from the >>>> point of view of your system, you are unplugging and plugging in the TV's >>>> from the system, probably in some random order, and the system has to >>>> quickly deal with handing changing scenarios of one monitor configuration >>>> after another as the TVs turn on... It's probably freaks out because it's >>>> asked to setup a display on one TV.... no wait 2 TVs... Just kidding 3 >>>> TVs... but it's still trying to handle the first one by the time it's asked >>>> to handle the 3rd one. I have a feeling that TV's also don't have the >>>> unique ID's that monitors have so it will also struggle to automatically >>>> place them back in the correct order once they are all up and running if >>>> you are using the same model TVs for all your displays. >>>> >>>> I personally use a single 50" 4K display for my desktop and other than >>>> having to turn it on and off by hand, it has worked flawlessly for the past >>>> 5 or 6 years... but then again, I'm only using the one TV for my display. >>>> Before that I used a 3 monitor setup, with actual computer monitors and I >>>> didn't have any problems at all with that. My brother had a system with I >>>> believe 16 computer monitors and that worked very well as well, but again >>>> that were actual monitors. >>>> >>>> I think I remember coming across a device that was a DPMS proxy that >>>> might fix your problem. It basically sits between you computer and display >>>> and fakes a monitor signal to your computer so that your TVs don't appear >>>> to be disappearing and reappear to your computer constantly. >>>> >>>> You could also hard code your display setup in your Xorg.conf so that >>>> it would have no choice but to setup your display like you like it, but >>>> that could make things difficult/stange for you at a later date if you ever >>>> change your display setup. >>>> >>>> Or, you could always get real computer monitors, but that would be very >>>> expensive which is probably why your using TVs in the first place. >>>> >>>> Brian >>>> >>>> On 8/20/20 5:25 PM, Michael Butash via PLUG-discuss wrote: >>>> >>>> I have had lots of issues with video and adapters the past few years, >>>> mostly as I'm forced to use them. My nvidia 1070 in my desktop has 3x >>>> DP1.2 ports and 1 HDMI2.0. I have 3 displays, so I use the 3x DP1.2 ports, >>>> and run those through adapters to HDMI2.0 on my Samsung TV's I use for >>>> monitors. Non-stop chaos ensues during power-down and up every day, >>>> something different, every linux desktop hates it. Often one display or >>>> another will freak out, and I end up; having to hard disconnect the adapter >>>> (ie, reboot it) to work again or it'll come up stuck in 768x1024 (on a 48" >>>> tv...). >>>> >>>> I found HDMI doesn't handle DPMS sort of power-off modes as vga, dvi, >>>> dp, or most methods of displays to handle soft power-off scenarios, ala >>>> just power down displays. When my laptop powers them down, they remain on >>>> with no signal, which seems to just confuse the video card and adapter that >>>> both freak out. This seems to have a profound effect on displaya and video >>>> cards that don't realize most displays are now hdmi... >>>> >>>> Graphic subsystems are a basketcase these days under linux, mostly >>>> because of these damn adapters, dongles >>>> , and vendor wars. >>>> Intel, that wants to sell all the things, including the most useless gpu on >>>> the earth, injects themselves into everything, and always cause me issues >>>> as I can't convince the os to use the (real) nvidia gpu. Probably the same >>>> sort of issue if an intel gpu is around with AMD. Last I used an AMD GPU >>>> some 4-5 years ago, it was an issue. Nvidia Prime via Intel is still >>>> sketchy af. >>>> >>>> Even on a dedicated nvidia gpu in a server-ish xeon system, with >>>> DP-to-whatever adapters I had nothing but issues. My latest iteration is >>>> my laptop (xps 9560) and a thunderbolt3/usb-c dock with 2x 4k/60hz outputs >>>> via one-piece DP-to-HDMI cables. I still have quirks, but I've learned to >>>> work around, and now somewhat understand really odd hardware behaviour >>>> enough to reproduce it. Occasionally I still need to disconnect a display >>>> at the DP-to-HDMI cable I use now, which is again oddly random. >>>> >>>> I don't like the adapters, but my 48" TV's I use for displays don't >>>> often come with DP ports native, and using HDMI comes with power management >>>> oddities. A lot depends on your cabling and even display these days. >>>> >>>> -mb >>>> >>>> >>>> On Wed, Aug 19, 2020 at 1:05 PM Seabass via PLUG-discuss < >>>> plug-discuss@lists.phxlinux.org> wrote: >>>> >>>>> No, on the desired monitor, it still black screens. >>>>> >>>>> Works just fine (Even without that parameter) on something that has a >>>>> direct HDMI cable, though. (TV) >>>>> >>>>> > Message: 6 >>>>> >Date: Tue, 18 Aug 2020 16:23:47 -0700 >>>>> > From: Aaron Jones >>>>> > To: plugaz@codezilla.xyz, Main PLUG discussion list >>>>> > >>>>> >Subject: Re: KMS but AMDGPU And Black Screen >>>>> > Message-ID: <6B7D5942-0F2F-4DAE-A54A-19215718DCF2@gmail.com> >>>>> > Content-Type: text/plain; charset="utf-8" >>>>> > >>>>> > https://bugzilla.redhat.com/show_bug.cgi?id=1594488 >>>>> > >>>>> > Set amdgpu.dc=0 in bios and it will work but without hdmi sound. >>>>> --------------------------------------------------- >>>>> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >>>>> To subscribe, unsubscribe, or to change your mail settings: >>>>> https://lists.phxlinux.org/mailman/listinfo/plug-discuss >>>> >>>> >>>> --------------------------------------------------- >>>> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >>>> To subscribe, unsubscribe, or to change your mail settings:https://lists.phxlinux.org/mailman/listinfo/plug-discuss >>>> >>>> >>>> --------------------------------------------------- >>>> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >>>> To subscribe, unsubscribe, or to change your mail settings: >>>> https://lists.phxlinux.org/mailman/listinfo/plug-discuss >>> >>> >>> >> --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > https://lists.phxlinux.org/mailman/listinfo/plug-discuss -- A mouse trap, placed on top of your alarm clock, will prevent you from rolling over and going back to sleep after you hit the snooze button. Stephen