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moby: generalize sun4i init failure to displayManager *and* greetd

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This commit is contained in:
Colin 2023-08-26 19:49:51 +00:00
parent a7f8089ed8
commit dc64193a62
2 changed files with 43 additions and 40 deletions
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40
hosts/by-name/moby/default.nix
View File

@ -132,44 +132,4 @@
'';
hardware.opengl.driSupport = true;
services.xserver.displayManager.job.preStart = let
dmesg = "${pkgs.util-linux}/bin/dmesg";
grep = "${pkgs.gnugrep}/bin/grep";
modprobe = "${pkgs.kmod}/bin/modprobe";
in ''
# common boot failure:
# blank screen (no backlight even), with the following log:
# ```syslog
# sun8i-dw-hdmi 1ee0000.hdmi: Couldn't get the HDMI PHY
# ...
# sun4i-drm display-engine: Couldn't bind all pipelines components
# ...
# sun8i-dw-hdmi: probe of 1ee0000.hdmi failed with error -17
# ```
#
# in particular, that `probe ... failed` occurs *only* on failed boots
# (the other messages might sometimes occur even on successful runs?)
#
# reloading the sun8i hdmi driver usually gets the screen on, showing boot text.
# then restarting display-manager.service gets us to the login.
#
# NB: the above log is default level. though less specific, there's a `err` level message that also signals this:
# sun4i-drm display-engine: failed to bind 1ee0000.hdmi (ops sun8i_dw_hdmi_ops [sun8i_drm_hdmi]): -17
# NB: this is the most common, but not the only, failure mode for `display-manager`.
# another error seems characterized by these dmesg logs, in which reprobing sun8i_drm_hdmi does not fix:
# ```syslog
# sun6i-mipi-dsi 1ca0000.dsi: Couldn't get the MIPI D-PHY
# sun4i-drm display-engine: Couldn't bind all pipelines components
# sun6i-mipi-dsi 1ca0000.dsi: Couldn't register our component
# ```
if (${dmesg} --kernel --level err --color=never --notime | ${grep} -q 'sun4i-drm display-engine: failed to bind 1ee0000.hdmi')
then
echo "reprobing sun8i_drm_hdmi"
# if a command here fails it errors the whole service, so prefer to log instead
${modprobe} -r sun8i_drm_hdmi || echo "failed to unload sun8i_drm_hdmi"
${modprobe} sun8i_drm_hdmi || echo "failed to load sub8i_drm_hdmi"
fi
'';
}

43
hosts/by-name/moby/kernel.nix
View File

@ -1,4 +1,44 @@
{ pkgs, ... }:
let
dmesg = "${pkgs.util-linux}/bin/dmesg";
grep = "${pkgs.gnugrep}/bin/grep";
modprobe = "${pkgs.kmod}/bin/modprobe";
ensureHWReady = ''
# common boot failure:
# blank screen (no backlight even), with the following log:
# ```syslog
# sun8i-dw-hdmi 1ee0000.hdmi: Couldn't get the HDMI PHY
# ...
# sun4i-drm display-engine: Couldn't bind all pipelines components
# ...
# sun8i-dw-hdmi: probe of 1ee0000.hdmi failed with error -17
# ```
#
# in particular, that `probe ... failed` occurs *only* on failed boots
# (the other messages might sometimes occur even on successful runs?)
#
# reloading the sun8i hdmi driver usually gets the screen on, showing boot text.
# then restarting display-manager.service gets us to the login.
#
# NB: the above log is default level. though less specific, there's a `err` level message that also signals this:
# sun4i-drm display-engine: failed to bind 1ee0000.hdmi (ops sun8i_dw_hdmi_ops [sun8i_drm_hdmi]): -17
# NB: this is the most common, but not the only, failure mode for `display-manager`.
# another error seems characterized by these dmesg logs, in which reprobing sun8i_drm_hdmi does not fix:
# ```syslog
# sun6i-mipi-dsi 1ca0000.dsi: Couldn't get the MIPI D-PHY
# sun4i-drm display-engine: Couldn't bind all pipelines components
# sun6i-mipi-dsi 1ca0000.dsi: Couldn't register our component
# ```
if (${dmesg} --kernel --level err --color=never --notime | ${grep} -q 'sun4i-drm display-engine: failed to bind 1ee0000.hdmi')
then
echo "reprobing sun8i_drm_hdmi"
# if a command here fails it errors the whole service, so prefer to log instead
${modprobe} -r sun8i_drm_hdmi || echo "failed to unload sun8i_drm_hdmi"
${modprobe} sun8i_drm_hdmi || echo "failed to load sub8i_drm_hdmi"
fi
'';
in
{
boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-megous;
# boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-manjaro;
@ -25,4 +65,7 @@
target = "Image.gz"; # <-- compress the kernel image
# target = "zImage"; # <-- confuses other parts of nixos :-(
};
services.xserver.displayManager.job.preStart = ensureHWReady;
systemd.services.greetd.preStart = ensureHWReady;
}