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[help][solved] Getting input lag on Bazzite (lemmy.nz)

submitted 3 days ago* (last edited 2 days ago) by Dave@lemmy.nz to c/linux_gaming@lemmy.world

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Hi all, I have recently installed Bazzite, after previously being on Nobara.

I have been playing Dave the Diver and DOOM (2016), both through Steam, and I get pretty serious input lag. A second or more delay at times, generally when FPS is struggling.

I'm running on a laptop with integrated graphics, so the struggling integrated GPU is not a surprise, but I didn't have this input lag issue with the same games on Nobara.

Any tips on a setting or something to help this?

I have lowered graphics settings to help with FPS, but ultimately I am not going to be able to avoid occasional FPS dips. The mouse input is instant, it's just an issue with the keyboard.

Any help appreciated!

Edit with solution: it seems the problem is IBus, see this comment: https://lemmy.nz/post/23401044/15684126

Basically the solution is to add IBUS_ENABLE_SYNC_MODE=2 to /etc/environment and restart.

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[–] just_another_person@lemmy.world 2 points 3 days ago (8 children)

We need more specs. Input lag is almost always due to resource constraints, and in gaming because the kernel is busy trying to to keep itself alive in some sense (meaning the scheduler is going crazy). My guess is this is a memory issue, so get your memory util while the games are running with free -m and post that, and also get dmesg output when the lag hits.

It should give some extra info. I'm guessing you've got a memory constrained system with regard to gaming, and insufficient swap on Bazzite.

[–] Dave@lemmy.nz 2 points 3 days ago (5 children)

At the same time as installing Bazzite, I also upgraded to 64GB RAM.

Here's the output of free -m when the game is being problematic.

$ free -m
               total        used        free      shared  buff/cache   available
Mem:           64076       14703       43303        3643       14036       49372
Swap:           4095           0        4095

Here's a pastebin of the dmesg output: https://pastebin.com/N6h3HP7D

I am sure you're right about it being resource contrained. It seems to get worse over time, and the GPU reports 100% all the time while the game is running. Just trying to work out if there is something I can change to make it happier.

[–] tal 2 points 3 days ago (1 children)

Yeah, you're not running into paging issues. That's plenty of memory available.

[–] Dave@lemmy.nz 3 points 3 days ago

I have (sort of) solved the issue. When holding a key down, the events seem to be firing faster than the games can keep up with. The longer a key is held down the more it queues up. So if I hold left for a while, then suddenly switch to right, it seems to have a backlog of left events to get through before it processes the right event.

I went into the system settings and changed the keyboard repeat speed to be a bit lower. Now it seems to send events at a speed the games can keep up with, even if I'm holding down a key.

I'm not sure if this counts as a real solution but it seems to solve the issue for me, and I doubt I'll notice the slightly slower repeat frequency (I think games are only listening for the up/down events so the repeat frequency probably doesn't affect them).

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