72 lines
2.9 KiB
Nix
72 lines
2.9 KiB
Nix
{ pkgs, ... }:
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let
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dmesg = "${pkgs.util-linux}/bin/dmesg";
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grep = "${pkgs.gnugrep}/bin/grep";
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modprobe = "${pkgs.kmod}/bin/modprobe";
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ensureHWReady = ''
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# common boot failure:
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# blank screen (no backlight even), with the following log:
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# ```syslog
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# sun8i-dw-hdmi 1ee0000.hdmi: Couldn't get the HDMI PHY
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# ...
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# sun4i-drm display-engine: Couldn't bind all pipelines components
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# ...
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# sun8i-dw-hdmi: probe of 1ee0000.hdmi failed with error -17
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# ```
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#
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# in particular, that `probe ... failed` occurs *only* on failed boots
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# (the other messages might sometimes occur even on successful runs?)
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#
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# reloading the sun8i hdmi driver usually gets the screen on, showing boot text.
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# then restarting display-manager.service gets us to the login.
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#
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# NB: the above log is default level. though less specific, there's a `err` level message that also signals this:
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# sun4i-drm display-engine: failed to bind 1ee0000.hdmi (ops sun8i_dw_hdmi_ops [sun8i_drm_hdmi]): -17
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# NB: this is the most common, but not the only, failure mode for `display-manager`.
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# another error seems characterized by these dmesg logs, in which reprobing sun8i_drm_hdmi does not fix:
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# ```syslog
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# sun6i-mipi-dsi 1ca0000.dsi: Couldn't get the MIPI D-PHY
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# sun4i-drm display-engine: Couldn't bind all pipelines components
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# sun6i-mipi-dsi 1ca0000.dsi: Couldn't register our component
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# ```
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if (${dmesg} --kernel --level err --color=never --notime | ${grep} -q 'sun4i-drm display-engine: failed to bind 1ee0000.hdmi')
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then
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echo "reprobing sun8i_drm_hdmi"
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# if a command here fails it errors the whole service, so prefer to log instead
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${modprobe} -r sun8i_drm_hdmi || echo "failed to unload sun8i_drm_hdmi"
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${modprobe} sun8i_drm_hdmi || echo "failed to load sub8i_drm_hdmi"
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fi
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'';
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in
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{
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boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-megous;
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# boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-manjaro;
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# boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_latest;
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# alternatively, apply patches directly to stock nixos kernel:
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# boot.kernelPatches = manjaroPatches ++ [
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# (patchDefconfig kernelConfig)
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# ];
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# configure nixos to build a compressed kernel image, since it doesn't usually do that for aarch64 target.
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# without this i run out of /boot space in < 10 generations
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nixpkgs.hostPlatform.linux-kernel = {
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# defaults:
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name = "aarch64-multiplatform";
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baseConfig = "defconfig";
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DTB = true;
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autoModules = true;
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preferBuiltin = true;
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# extraConfig = ...
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# ^-- raspberry pi stuff: we don't need it.
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# target = "Image"; # <-- default
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target = "Image.gz"; # <-- compress the kernel image
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# target = "zImage"; # <-- confuses other parts of nixos :-(
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};
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services.xserver.displayManager.job.preStart = ensureHWReady;
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systemd.services.greetd.preStart = ensureHWReady;
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}
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