Category Archives: Hardware

Slow wifi network on laptop

If network performance on your laptop is slow and unstable, it might be because power management of your wifi adapter and of Linux are not playing together. One of the things you will notice are flapping ping rates:

$ ping 192.168.0.1 
PING 192.168.0.1 (192.168.0.1) 56(84) bytes of data.
64 bytes from 192.168.0.1: icmp_seq=1 ttl=64 time=23.3 ms
64 bytes from 192.168.0.1: icmp_seq=2 ttl=64 time=44.7 ms
64 bytes from 192.168.0.1: icmp_seq=3 ttl=64 time=1161 ms
64 bytes from 192.168.0.1: icmp_seq=4 ttl=64 time=35.2 ms
...
^C
--- 192.168.0.1 ping statistics ---
30 packets transmitted, 20 received, 33% packet loss, time 30000.14s
rtt min/avg/max/mdev = 23.3/537.9/2119.2/2005.3 ms

As you can see the 3rd ping has a high round trip time of over one second. You might also notice high packet loss rates.

If this is the case and your hardware seems to be ok, you can try to switch off Network Manager's automatic power management in /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf:

[connection] 
wifi.powersave = 2

Restart NetworkManager (sudo systemctl restart NetworkManager) or reboot your Laptop.

If you are not using NetworkManager, you can try to switch off power management directly:

sudo iwconfig wlp2s0 txpower fixed

Afterwards check that power management is really disabled:

sudo iwconfig wlp2s0
...
Power Management:off
...
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Android smartphone "Cubot Echo"

  • https://www.cubot.net/smartphones/echo/spec.html

Pros
+ Very good overall hardware quality compared to cheap price (unbreakable display, strong body for outdoor use)
+ Good display, camera quality and performance compared to cheap price
+ Large 5.0 inch display
+ HDR photography
+ Up to 128 GB micro sdcard, 16 GB ROM
+ Plain Android user experience, no annoying modifications or add-ons
+ Removable battery
+ Cheap price

Cons
- Android security patch level only from 05.06.2017, but latest firmware update (which will be installed automatically after setup) DOES include security patch for WiFi WPA2 KRACK attack (build 08.02.2018). Android 6 Marshmallow does no longer receive security updates from Google, but you can install the unofficial Android alternative LineageOS based on Android 7 Nougat.
- No 4G / LTE support
- A bit heavy

Verdict
You can get this Android smartphone for as cheap as 60 EUR. If you can live with the security issues and the missing LTE support, that's a definitive buy. Especially considering that the upcoming Google Pixel 3 flagship for 850 EUR guarantees Android security updates for only 3 years. You could buy 14 Cubot Echos for that price. And the Google Pixel 3 does not have a removable battery, which makes it very hard to replace.

Cubot EchoCubot J3
Android VersionAndroid 6 Marshmallow
(no longer supported)
Unofficial support for LineageOS
based on Android 7 Nougat
Android 8 Oreo Go
ProcessorMT6580 1.3 GHz Quad-coreMT6580 1.3 GHz Quad-core
Display5" IPS
(1300:1 contrast)
5" TN
(18:9 format, 1000:1 contrast)
Brightness (cd/㎡)450450
Memory (RAM / ROM)2 GB / 16 GB1 GB / 16 GB
Max. Additional Storageup to 128 GB (not included)up to 64 GB (not included)
Camera (Back / Front)13 MP / 5 MP8 MP / 5 MP (interpolated)
LTEnono
ExtrasMicro + Standard Dual SIM, A-GPS, USB OTG, Special Sound Chip with Big SpeakerDual Nano SIM, Face ID, A-GPS,
Energy efficient
Battery3000 mAh (removable)2000 mAh (removable)
Price60 €50 €

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