# Installing on the Yoga C630

## Before you start

Leave Windows in place. Lenovo ships firmware updates only through Windows, and
the per-model Qualcomm blobs Linux needs live in that partition — wiping it
means losing accelerated graphics, audio and the sensor hub permanently.
Update everything through Lenovo Vantage first.

Disable Secure Boot. The image is not signed for it:

- Press **Fn+F2** during startup, go to **Security → Secure Boot → Disabled**, or
- **Settings → Update & Security → Recovery → Advanced startup → UEFI Firmware Settings**

## Write the image

```sh
zstd -d fedora-44-minimal-lenovo-yoga-c630-*.img.zst
sudo dd if=fedora-44-minimal-lenovo-yoga-c630-*.img of=/dev/sdX bs=4M status=progress oflag=direct conv=fsync
```

Check `/dev/sdX` twice. An 8 GiB stick is enough for `minimal`, 16 GiB for
`workstation`; the root filesystem expands to fill whatever you use.

## First boot

Insert the stick and power on holding **Fn+F12** for the boot menu, or enter
setup with **Fn+F2** and put USB ahead of the internal drive.

GRUB should appear with one entry. It has already been told which device tree to
load — the C630's UEFI does not supply one, which is the whole reason the
`devicetree` line exists in the boot loader entry.

First boot does two slow things: it relabels the filesystem for SELinux and
grows the root partition. Several minutes on a USB stick is normal. Log in as
`fedora` / `fedora` and set a new password when prompted.

## Extract the Qualcomm firmware

Accelerated graphics, audio, the sensor hub and video decode do not work
until you do this:

```sh
sudo c630-firmware
sudo reboot
```

See [firmware.md](firmware.md) if it cannot find the Windows partition.

## Installing to internal storage

Once the USB image is behaving, copy it onto the internal UFS. Boot from the
USB stick and run, on the laptop:

```sh
sudo ./build/install-to-disk.sh --dry-run    # show the plan, touch nothing
sudo ./build/install-to-disk.sh              # do it
```

It partitions the disk, copies the running system across, and rewrites every
UUID that has to change. Reboot afterwards and pick the internal drive from the
boot menu (**Fn+F12**), or just pull the stick out.

**This wipes the target disk.** If you still have Windows and want to keep it,
do not run this — shrink the Windows partition from within Windows first and
adapt the steps by hand.

Two things about this machine make the obvious approaches fail, both of which
the script handles:

**You cannot `dd` the image onto the internal drive.** The UFS reports
**4096-byte logical sectors**; the disk image is built with 512-byte sector
geometry. Its GPT header and every partition offset would land in the wrong
place. The disk has to be partitioned on the machine, at its own sector size.

**`efibootmgr` does not work here.** There are no EFI runtime variables —
`efibootmgr` reports *"EFI variables are not supported on this system"* — so
nothing can register a boot entry. GRUB therefore goes at the removable-media
path, `EFI/BOOT/BOOTAA64.EFI`, where the firmware finds it unprompted.

If you would rather do it by hand, the sequence is: `sgdisk` an ESP, a `/boot`
and a root partition; `mkfs.vfat` and `mkfs.ext4 -O
^orphan_file,^metadata_csum_seed`; copy `/`, `/boot` and the ESP separately
(preserving xattrs, or SELinux labels are lost); then update `/etc/fstab`,
`/etc/kernel/cmdline`, `root=UUID=` in `/boot/loader/entries/*.conf`, and the
`--fs-uuid` in both `/boot/grub2/grub.cfg` and `EFI/fedora/grub.cfg`.

## The clock, and why dnf lies about missing packages

This machine's RTC cannot be set — `hwclock --systohc` fails with
`ioctl(RTC_SET_TIME) to /dev/rtc0 to set the time failed: No such device` — and
it reads 1970 at every boot. systemd compensates by advancing the clock to its
own build date, which is close enough to look right and wrong enough to break
rpm.

The symptom is baffling if you have not seen it before:

```
$ sudo dnf install net-tools
Transaction failed: Rpm transaction failed.
  - systemd is needed by net-tools-2.0-0.77.20160912git.fc44.aarch64
```

systemd is plainly installed — the machine booted. But with the clock behind
the package's signing date, rpm rejects the signature as *not yet valid*, skips
that header entirely, and concludes the package is absent:

```
Signature 85b4 created at Sat Jul 25 18:33:30 2026 invalid: signature is not alive
  because: Not live until 2026-07-25T18:28:30Z
error: rpmdbNextIterator: skipping h#     282
package systemd is not installed
```

`chrony` is installed and enabled, and fixes this within a few seconds of the
network coming up — check with `timedatectl`. The gap only matters if you run
`dnf` before that, or on a machine with no network yet. Set it by hand in that
case:

```sh
sudo date -u -s "2026-07-27 16:33:00"
```

Any roughly-correct time will do; it only has to be later than the packages
were signed.

## If it does not boot

The kernel command line is the first thing to change. It lives in
`options` in `/boot/loader/entries/c630-*.conf`, and GRUB lets you edit it for
one boot by pressing **e**.

| Symptom | Try |
|---|---|
| Hangs immediately after GRUB, no kernel output | Wrong or missing device tree — check the `devicetree` line points at a file that exists in `/boot/dtb-*/qcom/` |
| Boots then freezes partway | Drop `efi=noruntime`, or add `pd_ignore_unused` if it is missing |
| USB dies during boot | Add `modprobe.blacklist=qcom_q6v5_pas` |
| Cannot find root filesystem | The initramfs is missing the UFS drivers — see `overlay/etc/dracut.conf.d/10-c630.conf` |
| 90-second stall early in boot | Add `systemd.tpm2_wait=0` |
| `dnf` says a package that is obviously installed is missing | The clock is behind — see above |

Adding `earlycon` and `ignore_loglevel` will tell you a great deal more about
which of these it is.