ASUS Zenbook UM425 - ArchWiki

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Reason: Hardware table needs some adjustments, page is missing a proper function keys table (Discuss in Talk:ASUS Zenbook UM425)

Hardware | PCI/USB ID | Working?
--- | --- | ---
GPU |  | Yes
Wireless |  | Yes
Audio |  | Yes
Touchpad |  | Partial
Keyboard |  | Partial
Camera |  | Yes
Card Reader |  | Yes
Bluetooth |  | Yes

## Configuration

### Secure Boot (option)

In order to boot any Linux operating system, navigate to BIOS (hold F2 during power-on), then hit `F7` or click on Advanced Menu, then the Security tab and set Secure Boot to `Off`.

If the aforementioned Secure Boot option is a menu rather than an on-or-off option, click on Secure Boot, Key Management, then Reset to Setup Mode and confirm in the dialog.

### Video

See AMD and Hardware video acceleration.

### Audio

See PulseAudio.

### Touchpad

See Libinput.

The NumPad is working with asus-touchpad-numpad-driver implementation from GitHub. Be sure to install python-libevdev and i2c-tools before starting systemd's service, otherwise this script will not work.

### Keyboard

Some people encounter issues on cold boot where the keyboard is unresponsive.

Adding `i8042.probe_defer` to the kernel parameters seems to resolve the problem, this can be done by either rebooting, using a USB keyboard, or using chroot.

See https://lore.kernel.org/lkml/20211112180022.10850-1-tiwai@suse.de/T/ (this commit only seems to mention the UA version but this was tested on UX425QA).

### Battery charge threshold

Battery charge threshold is working. Laptop's battery stops charging at certain percentage when value in `/sys/class/power_supply/BATT/charge_control_end_threshold` is set to either `60`, `80`, or `100`. But upower may report the wrong charging status and percentage when the battery threshold is set below `100`; You may see the status listed as `"Charging"` even when the battery is fully charged to the limit, and the percentage may be one point short of the limit. For example when charging to `80`, the battery's charge may say `79`. See https://gitlab.freedesktop.org/upower/upower/-/issues/142

In order to automatically change the value at boot, user can create the systemd service: refer to Laptop/ASUS#Battery charge threshold

## Tips and tricks

### Power saving and performance

As advertised by ASUS, both laptops are capable to last up to 20 hours on battery. In order to achieve this, see:

- BIOS update - It is generally recommended to update BIOS, as it usually brings performance, power-saving and security features.

- Power Saving - List of general recommendations to increase battery life.

- Improving performance - List of general recommendations to increase performance.

- SSD - Tips and tricks for Solid State Drives. Both laptops ship M.2 SSD by default.

- Undervolting CPU - Decrease voltage for Intel CPU (reduce battery drain, reduce heat and therefore - reduce fan speed)

### Extract Windows 10 license key

The laptop comes with Windows 10 preinstalled and the activation key is hardcoded into the firmware. If you replace Windows with Linux, then hardcoded activation key is useless. You might want to extract it and use somewhere else (e.g. virtualized Windows 10):

    # grep -aPo '[\w]{5}-[\w]{5}-[\w]{5}-[\w]{5}-[\w]{5}' /sys/firmware/acpi/tables/MSDM

Note: Microsoft online support confirmed that the code is valid, but because you are unable to activate it (Windows fails to activate and asks for another code), they offered 2 options - replace activation code with another one for 40$ or contact OEM (ASUS) about this issue. ASUS confirmed, that in order to "use" this activation key, you need to bring this laptop to repair service so they can "restore" system using ASUS OEM Windows 10 image. They do not provide this image for download.
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