Archive for the ‘Linux’ Category

Scenario before fix

Wifi works without major issue in Windows 10 i.e. no problem with the wifi module nor wifi antenna

The fix

Add one line containing following to /etc/modprobe.d/iwlwifi.conf

options iwlwifi 11n_disable=1

Following is a sample bash script incorporating the fix;

#!/bin/bash
echo “options iwlwifi 11n_disable=1” | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwlmvm
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

Credits to https://www.youtube.com/watch?v=ls3sE64Ril8

Note this fix should work on any variant of Linux which evaluates /etc/modprobe.d/iwlwifi.conf on start up. It should also work for any Intel chipset using iwlwifi (i.e. not limited to 8265 as per credited link)

Warning: Command line utilities tend to be simple but very powerful i.e. typing incorrect commands (especially the directions of < and > below) can result in your source drive being wiped out – suggest to back up important files before proceeding. Proceed with instructions below at your own risk.

Do following in an OS X terminal

1) Determine source/destination drives/disks;

mount

2) Unmount partition

diskutil unmount /Volume/XXXXXXX

3) Clone/image partition to file (assumes /dev/disk1 is source). Note: this can take some time depending on read/write speeds of drives;

sudo su -i
cat /dev/disk1|gzip -c9 > ./filename.cat.gz

4) Restore image to partition (assumes /dev/disk1 is destination and drive is unmounted). Note: this can take some time depending on write speeds of drives;

sudo su -i
gzcat ./filename.cat.gz > /dev/disk1

Above was tested using in OS X 10.12. You may get “unexpected end of file” / “uncompress failed” errors but nevertheless the commands work.

Warning: Linux utilities tend to be simple but very powerful i.e. typing incorrect commands (especially the directions of < and > below) can result in your source drive being wiped out – suggest to back up important files before proceeding. Proceed with instructions below at your own risk.

1) Install pv;


sudo apt-get install pv

2) Determine source/destination drives/disks;


sudo parted

Enter print all in the parted command line then look for /dev/sda, /dev/sdb etc. and associated partition descriptions to determine source/destination drives/disks.

3) Start the actual cloning/imaging (assumes /dev/sda is source and /dev/sdc is destination);


sudo su
pv < /dev/sda > /dev/sdc

4) Install new drive then use linux gparted utility to extend partition sizes.

Above was tested using an Ubuntu 14.04 LiveUSB with an internal source drive containing a Windows 10 and an Ubuntu 14.04 partition. Windows did report a strange error during initial boot after new drive was installed but sorted itself after restarting. No issues found booting into the Ubuntu partition.

SED examples

Posted: April 15, 2016 in Linux
Tags:

sed -i '/^#/d' vendor/broadcom/hammerhead/device-partial.mk #remove all lines beginning with #

sed -i '1,2d' vendor/broadcom/hammerhead/device-partial.mk #delete 1st 2 lines

sed -i 's_:broadcom \\_ _g' vendor/broadcom/hammerhead/device-partial.mk #replace :broadcom \ with a space

sed -i 's_:system_ system_g' vendor/broadcom/hammerhead/device-partial.mk #replace :system with system

sed -i 's_ vendor/_install -D -m 644 vendor/_g' vendor/broadcom/hammerhead/device-partial.mk #replace vendor/ with install -D -m 644 vendor/

sed '1 i\#!/bin/bash' vendor/broadcom/hammerhead/device-partial.mk #add #!/bin/bash to 1st line

Android phones may already have a terminal emulator app installed by default (otherwise install a terminal emulator app from the Google Play store) then do the following;

tar czvf - inputfilename |split -b 5M - outputfilename.tar.gz.

Resulting filenames will be outputfilename.tar.gz.aa, outputfilename.tar.gz.ab, outputfilename.tar.gz.ac etc.

inputfilename can be a file or folder, 5M in above example splits files into 5MB sizes.

To extract/recombine;

cat outputfilename* |tar xzvf -

Credits to StackExchange

Linux curl command usage example

Posted: September 2, 2015 in Linux
Tags:

Enter the following into any Terminal window to begin/continue downloading a file from most webservers.

curl -C - -O http://filename

Credits to TheGeekStuff

sudo pacman -S connman
sudo systemctl stop netctl
sudo systemctl disable netctl
sudo systemctl stop dhcpcd
sudo systemctl disable dhcpcd
sudo systemctl enable connman
sudo systemctl start connman
reboot
connmanctl > enable wifi
connmanctl > scan wifi
connmanctl > agent on
connmanctl > services (then copy wifi hash of your SSID)
connmanctl > quit
sudo touch /var/lib/connman/<SSID>-psk.config
sudo <your editor of choice> /var/lib/connman/<SSID>-psk.config
containing;

[service_wifi_<connman wifi hash of your SSID>]
Type = wifi
Name = <SSID>
Passphrase = <ASCII Passphrase>

… then quit editor/save file

connmanctl > scan wifi
connmanctl > services (and you’ll note an “AO” next to your SSID i.e.
already connected – wifi will be auto enabled upon boot from now on)