Not an ultrawide or multi-monitor user (single 4K 27” miniLED for me), but hdr support is so close to being perfect but not quite there yet. The support has finally been added to Wayland git and is coming in the next update iirc, but at the moment it relies on your window manager’s implementation (KDE’s works great) and doesn’t work for gaming without running gamescope (steam’s window manager) in a window. The only issue I think will remain with HDR after the next update is with apps that stubbornly use X instead of Wayland (steam is the one that kills me here), since X won’t ever support it so those apps will be SDR.

In terms of OLED support, they don’t need to be treated specially to work so any of them should work as normal - only thing to be aware of is that WOLED panels made by LG (used in asus monitors too) use an uncommon subpixel layout and you may have to set it manually or fiddle with your text rendering settings a little to see it perfectly. Samsung panels (like the ones Alienware uses) use the normal layout so no concerns if you go with that. Otherwise, screen dimming / turning off after a period of inactivity is a common feature and should be good enough for protecting from burn in. The only other OS-level feature I’ve seen related to OLEDs is shifting sustained bright pixels around to share the load - not sure if anyone’s made this on Linux, it sounds awful to use so I’ve never looked into it.

Someone else already mentioned old games not supporting ultrawide well, but worth adding if you go OLED you can just run it 16:9 and the letterboxing won’t be nearly as obnoxious as on a standard IPS/VA/TN/whatever monitor that would be blasting ugly blue/black light from the “disabled” areas.

i have a 3 monitor setup for work machine and a 49" 32:9 ultrawide for my home machine. i like them both because of the things i do on them.

my home rig is regularly for gaming. a single, large, high ppi, high refresh rate, ultrawide monitor is amazing for a gaming-first setup. there is flexibility for off-work productivity here where i split 1/3x3, 2/3-1/3, or even 2/3-2/3 with 1/3 overlap.

my work rig is regularly for programming, communication (chat, video conference, email, ticket comments), time management, word processing & diffing, testing web clients… i have to do a lot of things. the structured 3-monitored layout is great for me to keep everything in its place and flip between them frequently.

both multi-monitor and single-monitor setups have their benefits. all that matters is that you choose according to your preference and expected use-case.

Just my two cents: I’ve had occasional problems with games through steam on dual monitors. Things like losing mouse focus or changing resolution on the other monitor (though that hasn’t happened for a long time).

Monitors are old Asus. I won’t bother looking up the models as I’m sure they’re outdated

I have an Alienware AW3423DWF and use it with Fedora KDE.

No problems here. Some games don’t support ultrawide without mods but I haven’t encountered any of these mods that don’t work on Linux yet.

As for HDR, it should be ready for primetime once Proton 10 comes out with Wayland support. As of right now, you have to either run your game through gamescope or use Wine/Proton with Wayland support enabled, e.g. Proton-Tkg (Wine master).

It’s a really good monitor by the way, still impresses me with its pure black on a regular basis, even in SDR.

Have personally found an ultra wide to work better as the secondary monitor. Can use it like 1.5 screens.

No issues on the various distros tried. The difficulty appears to be when having both hdmi and displayport connected instead of 1 or the other. (More than likely wrong just what I’ve experienced)

Can’t speak to hdr but found the hassle of ultrawide compatibility on games to be not worth it. Most work out of the box but play a good bit of older games and those can have some hiccups.

YRMV

I would kill for a 32:10 monitor

I did multi monitors for years and switched to a single 34" 3440*1440 ultrawide both at work and at home and I have never considered going back. I use a curved msi at home and a flat samsung at work. I would go larger size or higher resolution eventually but ultrawide is really nice for cad work so you still get a good work area without the sidebar eating into your view/modeling space. For normal use, I just do window snapping so I still get the function of two work areas.

What resolution do you play at? Ultrawide for gaming is really niche, I don’t recommend it.

works fine on KDE, I use a 34" and wouldn’t go back to a two monitor setup. Maybe two ultra-wides stacked vertically? But not 16:9.

I use a 34" UW as my main and a 24" as my secondary works great.

I use a 49" ultrawide. I find a window manger work very well with it.

5120x1440p

I’m a sucker for window managers, so my preference is towards more displays, rather than bigger ones. It’s mostly been dual horizontal setup, but I’ve rocked a triple vertical setup once that’s been absolutely glorious for browser, terminal, and email client.

Gamingwise I would also suggest sticking to a multimonitor setup. It’s easier to drive a smaller resolution.

OLED is a physical thing - OS and userspace doesn’t care about it. HDR - not absolutely sure as I don’t have a monitor to test, but I’ve definitely seen wlroots merge support for it.

I’ve tried both and I prefer Ultrawide for the following reasons:

• Less cables. Cable management is already hard enough as it is.
• No borders in between screens. Looks amazing when watching movies and for gaming.

My current monitor is a GIGABYTE G34WQC.

I went for ultra big. 42’ 4k OLED with no scaling is beautiful for gaming and practical for work.

I went for a 27" 1440p w/ 24", but that’s because I had the 24" laying around.

I use an ultrawide at work, and it’s fine, but I generally just use it like two monitors anyway, so for productivity I’d prefer two monitors so I’m not screwed when one dies. But I haven’t done any gaming on that monitor, so I’m not sure how the extra real estate would feel for the games I play.

I’m considering replacing my 24" and am considering another 16:9, just bigger (30+") and 4k, though I’m worried my GPU will struggle (6650XT). We’ll see.