About force_introspection

[bvr-yr]

as per wiki

Introspection is aimed at reducing GPU usage in certain cases, but might cause graphical glitches on nvidia.

first question, in which cases does it reduce GPU usage?

second, it is a bit misleading: forcing it helps to reduce? or setting it to 0

I have to set to 1 on intel iGPU cause i see minor glitches in foot (scroll bar) and while some gtk apps launching

I often rely on long battery-time with laptop, so I try to reduce gpu and cpu usage as much as possible when needed.

what's an impact of setting it 0/1?

[vaxerski]

what's an impact of setting it 0/1?

with introspection you get one additional drawcall at the end of each render pass per damage region

without you dont

[bvr-yr]

yeah i see, it brings down gpu usage from ~10% to 5-6% on mpv video with hw-accel

is this a bug that intel affected?
though i didn't noticed any other glitches rather than foot's scrollbar

000646-eDP-1.mp4

[vaxerski]

that's odd and doesn't look like a bug from the lack of introspection, tbh

[bvr-yr]

hm dunno then
but setting force_introspection = 1 fixes

i don't know how to file an issue, kinda niche but i doubt it is foot's fault

[1player]

I'm seeing the same bug on foot, but force_introspection = 1 doesn't fix it. AMD GPU.

Hyprland, built from branch  at commit e93fbd7c4f991cb8ef03e433ccc4d43587923e15  (props: bump ver to 0.39.0).
Date: Sun Apr 14 18:48:28 2024
Tag: v0.39.0, commits: 1

flags: (if any)

[bvr-yr]

yeah those glitches still occur, definitely need an opened issue

[Vaisakhkm2625]

setting a indicator string fixes the issue in foot

[scrollback]
indicator-format=#

https://man.archlinux.org/man/foot.ini.5.en#SECTION:_scrollback