Acer Aspire TimelineX 4820TG - ArchWiki

# Acer Aspire TimelineX 4820TG

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Acer Aspire TimelineX 4820TG is a 14-inch laptop that packs in an Intel Core i5-430M processor and dedicated ATI Radeon HD 5650 graphics, making it a powerful 14-inch laptop. ArchLinux works mostly works out of box, but there are few tweaks required to make the hardware fully compatible with ArchLinux.

## Hardware

Make sure that you have BIOS_Acer_1.25_A_A.zip installed.

## PowerSmart / Battery Optimization

### Switchable Graphics

This laptop contains inbuilt Intel HD & Radeon 5650 graphics adapters. The Intel HD graphics adapter is optimized for low power consumption which Radeon 5650 consumes high power.

To use Linux kernel's "Laptop Hybrid Graphics - GPU switching support" add following to fstab:

    none            /sys/kernel/debug debugfs defaults 0 0

This will enable `/sys/kernel/debug/vgaswitcheroo/switch`.

    # cat /sys/kernel/debug/vgaswitcheroo/switch

    0:IGD:+:Pwr:0000:00:02.0
    1:DIS: :Pwr:0000:01:00.0

IDN - denotes integrated Intel graphics. DIS - denotes discrete Radeon graphics.

To switch-off Radeon:

    # echo "DIGD" > /sys/kernel/debug/vgaswitcheroo/switch
    # echo "OFF"  > /sys/kernel/debug/vgaswitcheroo/switch

    # cat /sys/kernel/debug/vgaswitcheroo/switch

    0:IGD:+:Pwr:0000:00:02.0
    1:DIS: :Off:0000:01:00.0

To switch-on both graphics chips:

    # echo "DIGD" > /sys/kernel/debug/vgaswitcheroo/switch
    # echo "DDIS" > /sys/kernel/debug/vgaswitcheroo/switch

### Enable CPU Frequency Scaling

Enabled by default, see CPU frequency scaling for details.

### Power Usage

The power rating before tweak -

    Power usage (ACPI estimate): 24.1W (2.8 hours)

The power rating after "switching off the radeon graphics" and "enabling laptop-mode tools".

    Power usage (ACPI estimate): 11.1W (6.5 hours)

### Sensors

Install lm_sensors.

## Synaptics Touchpad

See Touchpad Synaptics.

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- Acer

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