Difference between revisions of "Acer Aspire TimelineX 4820TG"

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For more information check [[Synaptics Touchpad|Touchpad_Synaptics]]
For more information check [[Touchpad_Synaptics]]

Revision as of 15:51, 30 May 2015

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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.


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 /etc/fstab

none            /sys/kernel/debug debugfs defaults 0 0

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

[root@arp arp]# cat /sys/kernel/debug/vgaswitcheroo/switch
1:DIS: :Pwr:0000:01:00.0

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

To switch-off Radeon, do following -

[root@arp arp]# echo "DIGD" > /sys/kernel/debug/vgaswitcheroo/switch
[root@arp arp]# echo "OFF"  > /sys/kernel/debug/vgaswitcheroo/switch
[root@arp arp]# cat /sys/kernel/debug/vgaswitcheroo/switch
1:DIS: :Off:0000:01:00.0

To switch-on both graphics chips, do following -

[root@arp arp]# echo "DIGD" > /sys/kernel/debug/vgaswitcheroo/switch
[root@arp arp]# echo "DDIS" > /sys/kernel/debug/vgaswitcheroo/switch

Init script for switching off the Radeon card -

Note: There is now a vgaswitcheroo systemd service which should be used instead
[root@arp arp]# cat /etc/rc.d/radeon_off 


. /etc/rc.conf
. /etc/rc.d/functions

case "$1" in

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

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

     stat_busy "Restarting radeon_off ..."
     $0 stop
     $0 start

     echo "usage: $0 {start|stop|restart}"

[root@arp arp]# chmod +x /etc/rc.d/radeon_off 

Switch the Radeon off while booting. Add following at the end of the file : /etc/rc.sysinit

#Switch-off discrete graphics
/etc/rc.d/radeon_off restart

/bin/dmesg >| /var/log/dmesg.log

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)


[arp@arpc ~]$ sudo modprobe coretemp
[arp@arpc ~]$ sensors
Adapter: Virtual device
temp1:        +53.0°C  (crit = +105.0°C)

Adapter: PCI adapter
temp1:       +2147355.6°C  

Adapter: ISA adapter
Core 0:       +49.0°C  (high = +95.0°C, crit = +105.0°C)

Adapter: ISA adapter
Core 2:       +53.0°C  (high = +95.0°C, crit = +105.0°C)

Synaptics Touchpad

The Synaptics driver is available from xf86-input-synaptics package [extra] repository

 # pacman -S xf86-input-synaptics

The default configuration is available at /etc/X11/xorg.conf.d/10-synaptics.conf

Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Option "TapButton1" "1"
        Option "TapButton2" "2"
        Option "TapButton3" "3"
        Option "SHMConfig"  "true"
        Option "VertEdgeScroll" "on"
        Option "VertTwoFingerScroll" "on"
        Option "HorizEdgeScroll" "on"
        Option "HorizTwoFingerScroll" "on"
        Option "CircularScrolling" "on"
        Option "CircScrollTrigger" "2"
        Option "EmulateTwoFingerMinZ" "0"

For more information check Touchpad_Synaptics