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kwin: apply @tildearrow's low latency patch #101041

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pasqui23
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Motivation for this change

Adapting my previous work in #89234 to Plasma 5.18
Fixes #85541

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

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This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-ready-for-review/3032/340

plasma-framework, libcap, libdrm, mesa
plasma-framework, libcap, libdrm, mesa,

lowLatencyPatch ? true, fetchpatch ? null
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Suggested change
lowLatencyPatch ? true, fetchpatch ? null
lowLatencyPatch ? true, fetchpatch

Should we enable this on default? I am not sure. @ttuegel do you have an opinion about this?

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No, I think we should not add patches by default that aren't fixing some bug. But, we can add a top-level attribute for it, so it will be built with and without the patch on Hydra.

@@ -37,7 +39,13 @@ mkDerivation {
patches = [
./0001-follow-symlinks.patch
./0002-xwayland.patch
];
]++ lib.optional lowLatencyPatch (fetchpatch {
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]++ lib.optional lowLatencyPatch (fetchpatch {
] ++ lib.optional lowLatencyPatch (fetchpatch {

@ttuegel
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ttuegel commented Nov 28, 2020

Besides my other comment, please add a NixOS option to override the kwin package chosen by the Plasma module.

@InternetUnexplorer
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InternetUnexplorer commented Jan 4, 2021

Besides my other comment, please add a NixOS option to override the kwin package chosen by the Plasma module.

@ttuegel I'm not the author, but I might give it a go (if the author doesn't mind, of course) since this PR seems to have stalled and I'm interested in learning more about NixOS. However, I'm having trouble figuring out the specifics (mostly naming).

I looked around a bit and services.xserver.desktopManager.plasma5 seems like it might be a good place to put it, but I'm not sure what the option name should be. Some ideas are:

  • kwinPackage
  • kwin.package
  • kwin

In general I'm not super familiar with NixOS yet, and so while I've looked a bit at other modules I still don't have a good sense of what would be most consistent/predictable.

Also, would desktops/plasma-5/3rdparty/kwin be a good place to put the kwin-lowlatency package?

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I'm wondering if this and #85541 should be closed, as it was mentioned in #108987 that an overlay is probably the best way to go.

For everyone here who was interested, I've set up an overlay and binary cache here which I plan on keeping up-to-date for the foreseeable future.

@pasqui23
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@InternetUnexplorer is right, this is better as an overlay

@pasqui23 pasqui23 closed this Jan 16, 2021
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Add package for kwin-lowlatency
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