| Commit message (Collapse) | Author | Age | Files | Lines |
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Promotes linux-hardened to the sole primary kernel and replaces
linux with linux-lts as the safety-net fallback. Rationale:
- linux and linux-hardened track the same upstream major version
and ship within days of each other, so 'linux' was a poor
fallback for the regression class that historically takes out
the hardened kernel on this hardware (e.g. checkpoint 026
wake-from-suspend panic). linux-lts lags by weeks/months and is
almost always known-good when hardened breaks.
- Drop etc/mkinitcpio.d/linux.preset, add linux-lts.preset.
Hardened preset header + bootstrap.sh efibootmgr instructions
updated accordingly (hardened registered first so it's the
default; lts registered as the on-demand fallback).
- Also add mkinitcpio-firmware (AUR) to silence the spurious
'missing firmware' warnings during initramfs builds.
Manual host-side steps after deploy:
paru -S linux-lts linux-lts-headers mkinitcpio-firmware
sudo pacman -Rsn linux # or via 'just pkg-apply' undeclared flow
sudo rm -f /etc/mkinitcpio.d/linux.preset # chezmoi-deployed, not pkg-owned
sudo mkinitcpio -P
sudo efibootmgr # add the Arch LTS entries, drop the stock linux ones
Note: meta/nvidia.txt still lists 'linux-headers' for nvidia-dkms.
That's a per-host concern; flagged for follow-up if any nvidia host
moves to the linux-lts world.
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Confirmed root cause: this hardware's S3 (deep) firmware path triggers a
fatal wake-from-suspend hang only on linux-hardened. INIT_ON_FREE + slab
hardening + tighter locking turn a latent driver race that stock linux
gets away with into an unrecoverable panic so early the journal isn't
even flushed. mem_sleep_default=s2idle bypasses the BIOS S3 path
entirely (s0ix is a pure-kernel low-power state) and suspends/resumes
reliably under hardened.
This is a widespread Lenovo S3 firmware issue across post-2018
ThinkPads (see Ubuntu T560, X1C9/10/11 reports). Lenovo themselves
moved newer firmwares to s2idle-only. Not a linux-hardened bug per se;
just hardened being a strict enough kernel to make the bug fatal.
Keep:
* mem_sleep_default=s2idle in etc/kernel/cmdline-linux-hardened.tmpl
(only the hardened UKI; stock linux keeps unchanged shared cmdline)
Revert (all the diagnostic / speculative scaffolding from the last
few commits):
* MODULES=(intel_lpss_pci) → MODULES=() — Arch wiki touchpad fix was
not the cause here
* nmi_watchdog=panic softlockup_panic=1 panic=10 — only needed to
auto-reboot during diagnosis
* no_console_suspend — diagnostic-only
* etc/systemd/logind.conf.d/20-no-suspend.conf — masking workaround
* sleep-target masking block in run_onchange_after_deploy-etc.sh.tmpl,
replaced with a one-shot cleanup that removes any leftover
/dev/null symlinks from systems that ran the previous version
* systemd-pstore.service from systemd-units/system.txt — added only to
catch the diagnostic panic
* diagnose-suspend.sh helper (and its .gitignore/.chezmoiignore entries)
* sway suspend → lock-session keybind workaround
* power-menu.sh Suspend entry restoration
* KEYBINDS.md docs
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Symptoms (Intel CPU + linux-hardened + blinking caps lock + hard
hang on resume from S3) are a direct match for the Arch wiki entry:
https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate#Touchpad_causes_a_kernel_panic_on_resume
https://bbs.archlinux.org/viewtopic.php?id=231881
When intel_lpss_pci is loaded late (via udev after userspace is up),
the touchpad/I2C controller it parents can be torn down by suspend
before the module's resume callback is registered, leading to a
NULL-deref panic during resume. The kernel never makes it far enough
to flush logs — which matches our 'PM: suspend entry (deep)' being
the last journal line.
Fix: load intel_lpss_pci from the initramfs so it's available before
the suspend/resume code path runs.
Why this only bites linux-hardened: the hardening config enables
INIT_ON_FREE, slab freelist hardening, page poisoning, and stricter
pointer validation, which turn what's a silent UAF on stock linux
into an immediate panic on hardened. Stock 'just works' by accident.
Also drop the speculative init_on_free=0 from the hardened cmdline
now that we have a targeted hypothesis. Keep nmi_watchdog=panic +
softlockup_panic=1 + panic=10 as belt-and-braces: if this fix is
wrong, the next hang will auto-reboot with a usable panic log in
'journalctl -b -1 -k' instead of needing the power button again.
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Split the hardened UKI cmdline off the shared etc/kernel/cmdline.tmpl
so we can carry workarounds without poking the stock linux build.
Daily-driving linux-hardened on this hardware has reliably hung on
resume from S3: black screen, blinking caps-lock + power LED, only
the power button helps. The kernel journal stops at 'PM: suspend
entry (deep)' with nothing after, so the freeze is below the level
where logs can flush — characteristic of a hard hang inside a device
driver's suspend/resume callback rather than a userspace bug.
linux-hardened defaults init_on_free=1, which zeroes pages on free.
On Intel + iwlwifi/i915/nvme stacks this routinely surfaces latent
UAFs as suspend hangs that are invisible on stock linux. Drop that
knob to 0 for the hardened cmdline as the working hypothesis.
Add nmi_watchdog=panic, softlockup_panic=1, panic=10 so if the next
attempt still wedges, a stuck CPU self-panics and auto-reboots
within ~10s, giving us a 'journalctl -b -1 -k' trace to look at
instead of having to force-power-off blindly.
Stock linux is untouched.
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Keeping the fallback after all — leaves the door open to dropping the
stock 'linux' package entirely once linux-hardened is proven as a
daily driver. Without hardened-fallback, that future single-kernel
config would have zero autodetect recovery path.
This reverts commit c0c9183.
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Stock linux-fallback already covers the 'autodetect missed a module'
recovery scenario, regardless of which kernel you tried to boot.
hardened being opt-in means a hardened-default failure naturally
falls back to stock — no need for hardened-fallback as a second
safety net. Saves ESP space and mkinitcpio regen time on each
linux-hardened update.
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Installs linux-hardened + linux-hardened-headers alongside the stock
linux kernel. Stock kernel remains the default; linux-hardened is opt-in
via efibootmgr --bootnext after the EFI entry is registered (one-time
host-side step, documented in the preset).
After first 'just pkg-apply', mkinitcpio auto-builds
/boot/EFI/Linux/arch-linux-hardened.efi from the new preset (sharing
etc/kernel/cmdline.tmpl with the stock UKI — same LUKS root, no
kernel-specific cmdline knobs).
Host-side EFI entry registration:
sudo efibootmgr --create --disk /dev/nvme0n1 --part 1 \
--label 'Arch Hardened' --loader '\\EFI\\Linux\\arch-linux-hardened.efi'
Roll back any time by removing both packages and the preset file; the
stock kernel and its UKI are untouched.
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sommerfeld