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Fix stale docs: grub cmdline now has resume params, swapfile back for hibernation

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
ergosteur
2026-09-28 23:24:03 -04:00
co-authored by Claude Opus 5.5
parent 052eeba304
commit 40531f33f9
3 changed files with 16 additions and 11 deletions
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CLAUDE.md
+3 -1
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@@ -63,7 +63,9 @@ scaling) and it's only the greeter — the actual logged-in Plasma/Wayland
session correctly renews the modeset itself and comes up at full native session correctly renews the modeset itself and comes up at full native
`3200x1800` with 125% scaling, confirmed working. No kernel cmdline `3200x1800` with 125% scaling, confirmed working. No kernel cmdline
workarounds are needed — `/etc/default/grub`'s `GRUB_CMDLINE_LINUX_DEFAULT` workarounds are needed — `/etc/default/grub`'s `GRUB_CMDLINE_LINUX_DEFAULT`
is back to a clean `'splash'`. has no i915 params (as of 2026-09-28 it's `'splash resume=UUID=…
resume_offset=…'`; the resume params are for hibernation, see
`NEON-CUSTOMIZATIONS.md`).
Confirmed reliable across multiple clean `sudo systemctl poweroff` / Confirmed reliable across multiple clean `sudo systemctl poweroff` /
power-on cycles. The GRUB default entry (index 0, `GRUB_DEFAULT=0`) auto- power-on cycles. The GRUB default entry (index 0, `GRUB_DEFAULT=0`) auto-
NEON-CUSTOMIZATIONS.md
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@@ -62,7 +62,9 @@ named in the black-screen notes in `CLAUDE.md`. Old 7.x kernels
`/etc/default/grub` (edited by hand several times; both `matt` and root `/etc/default/grub` (edited by hand several times; both `matt` and root
history show `nano /etc/default/grub` + `update-grub`): `GRUB_DEFAULT=0`, history show `nano /etc/default/grub` + `update-grub`): `GRUB_DEFAULT=0`,
`GRUB_TIMEOUT=5`, `GRUB_TIMEOUT_STYLE=menu`, `GRUB_TIMEOUT=5`, `GRUB_TIMEOUT_STYLE=menu`,
`GRUB_CMDLINE_LINUX_DEFAULT='splash'` (see `setup-i915-kernel7-fix.sh`). `GRUB_CMDLINE_LINUX_DEFAULT='splash resume=UUID=3af45daa-b8c2-4053-9574-a958e0c3ea68
resume_offset=17674240'` (the `resume` params were added 2026-09-28 for
hibernation, see below; see also `setup-i915-kernel7-fix.sh`).
## Storage / wear on the microSD root ## Storage / wear on the microSD root
ZRAM.md
+10 -9
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@@ -6,18 +6,19 @@ in RAM. That suits this machine: 15GiB RAM, and neon's root lives on a
slow microSD card in the built-in slot (`sda`) that you don't want to swap to or wear slow microSD card in the built-in slot (`sda`) that you don't want to swap to or wear
out. out.
## Current state (2026-09-27) ## Current state (2026-09-28)
``` ```
$ zramctl
NAME ALGORITHM DISKSIZE DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 zstd 8G 4K 59B 20K [SWAP]
$ swapon --show $ swapon --show
NAME TYPE SIZE USED PRIO NAME TYPE SIZE USED PRIO
/dev/zram0 partition 8G 0B 100 /dev/zram0 partition 8G 582.5M 100
/swapfile file 16G 0B 10
``` ```
The zram device is the only swap. zswap is off zram (priority 100) takes all everyday swapping. The 16GB `/swapfile`
(priority 10) is there for the hibernation image (see
"Suspend-then-hibernate" in `NEON-CUSTOMIZATIONS.md`). It only gets
ordinary swap pages if zram fills up. zswap is off
(`/sys/module/zswap/parameters/enabled` = `N`), and there's nothing (`/sys/module/zswap/parameters/enabled` = `N`), and there's nothing
zram-related on the kernel command line. zram-related on the kernel command line.
@@ -82,8 +83,8 @@ SIZE=8192
PRIORITY=100 PRIORITY=100
EOF EOF
sudo systemctl enable --now zramswap sudo systemctl enable --now zramswap
# comment out any /swapfile line in /etc/fstab, then: # drop any old swapfile from /etc/fstab (a hibernation swapfile is set
sudo swapoff /swapfile # up separately, see NEON-CUSTOMIZATIONS.md)
# persist swappiness # persist swappiness
echo 'vm.swappiness=100' | sudo tee /etc/sysctl.d/99-zram.conf && sudo sysctl --system echo 'vm.swappiness=100' | sudo tee /etc/sysctl.d/99-zram.conf && sudo sysctl --system
``` ```