Alla inlägg av Ichimusai

Sleep resume in Ubuntu screws up mouse pad

I found that my Lenovo laptops did not always get the mousepad right when coming out of sleep or hibernate. After a bit of research I found that a modprobe remove and insert of the psmouse kernel module did the trick.

To automatize this you can insert a file in the systemd control structure to fix the problem yourself (if you are experiencing it). Below is a block of code. Save this to a file in /lib/systemd/system-sleep/touchpad

#!/bin/sh

PATH=/sbin:/usr/sbin:/bin:/usr/bin

case "$1" in
    pre)
    #code execution BEFORE sleeping/hibernating/suspending
    # unload touchpad driver
	/usr/sbin/modprobe -r psmouse
    ;;
    post)
    #code execution AFTER resuming
    # reload touchpad driver
	/usr/sbin/modprobe psmouse
    ;;
esac

exit 0

Ubuntu Linux kernel 4.0.15-29 diasbles keyboard on Lenovo T420s

Recent update to one of my laptops made the keyboard completely stop working. While rebooting to the previous kernels made it work again.

The kernel that’s the culprit is the generic kernel 4.0.15-29 which does not even work in recovery mode. I have disabled this kernel on my system but could not find information out there about others with similar symptoms so I am writing this here in order to quickly get something out.

Ingefärsshot

Jag gillar ingefära och här kommer mitt recept på ingefärsshot.

1 st rot ingefära
1 liter vatten
1/2 pkt konc. äppeljos
1/2 st citron

Kaffefilter
Hållare för kaffefilter

Börja med att riva ingefärsroten i en skål. Använd grova sidan på rivjärnet, det duger gott åt detta.

Slå i ca 1/3 av vattnet. Knåda den rivna roten och pressa ur saften i vattnet. Häll vattnet genom kaffefiltret till en flaska. Fortsätt med de andra delarna av vattnet på samma sätt. Krama ur all vätska som går ur den rivna roten med händerna.

Tillsätt ca 1/2 paket koncentrerad äppeljuice.
Tillsätt 1/2 citron eller 3-5 msk färdig citronsaft

Skaka om, ställ på kylning.

Lagom är ungefär 2-4 cl. Det kan vara ganska starkt.

Espresso i fält

Det är få saker som förhöjer stämningen så pass när man är ute och vandrar, på picnic eller av annat skäl befinner sig på resa som att få en kopp riktigt gott kaffe. Jag har i ett par års tid haft med mig en portabel espressomaskin som kallas Minipresso när jag varit ute på olika äventyr och jag kan bedyra dess kvalitet och funktion.

Denna modell heter Minipresso GR. Det finns en annan som heter NS som används med kaffekapslar av Nespresso-typ. Denna har fördelen med enklare rengöring och mindre pill med att fylla i kaffe osv men den har också nackdelen att man är hänvisad till Nespressos sortiment.

Minipresso

Så här ser den ut, ca 18 cm lång och Ø 6-7 cm. Vikten ligger på 350 g. Känslan är ganska gedigen. Hela apparaten utom filtret i den är tillverkat av en slagtålig och slitstark plast, märkningen visar det är en termoplast typ 1 som används vilket är PET som är livsmedelsgodkänd och samma termoplast som används för läskedrycksflaskor. Denna verkar armerad med kol eller liknande som ger den lite mer ruggad känsla.

Minipresson består av ett antal delar som alla är nödvändiga för dess funktion.  Här ser vi Minipresso isärplockad i sina beståndsdelar, först övre raden: vattenbehållare, kaffemått, pressfilter; därefter undre raden: pumphus, kaffemugg, filterkopp.

Minipresso delar

Man börjar med att fylla pressfiltret med kaffe. För bästa resultat använd espressokaffe av god kvalitet. Fyll en måttskopa och häll i pressfiltret, vänd på den och använd botten för att försiktigt trycka till kaffet. Ta bort eventuella smulor från kanten på filtret då det är viktigt att det tätar väl mot pumphuset.

Minipresso påfylld

Därefter monteras pressfiltret med kaffe mot filterkoppen och sedan monteras alltihop på pumphusets ena ände.

Minipresso kaffe monterat

Minipresso kaffe och filter monterat på pumphuset

Vattenbehållaren fylls med så varmt vatten som möjligt, jag brukar koka upp på stormköket och fylla. Varning för att fylla för mycket vatten! När man skruvar fast behållaren på pumphuset kan det läcka hett vatten och man bränner sig, så fyll enbart till markeringen.

Minipresso vattenbehållare

När allting är färdigmonterat är det bara att vrida lätt på pumphantdaget för att fälla ut den, därefter kramar man pumpen 3-4 gånger eller tills det kommer kaffe, därefter väntar man gärna en stund och låter kaffet ”dra” lite innan man pumpar ut resten av kaffet.

Minipresson pumpar

Minipresso klar

Sedan är det bara att njuta av en nygjord espresso. Den enda egentliga nackdelen är att det är lite att rengöra, filterhus och pressfilter behöver sköljas ur och man får skaka lite på den för att få ur vattnet som annars inte torkar. När man kommer hem igen är det bra om man låter den ligga framme och torka ordentligt för att undvika att man får gammalt sunkigt vatten som ligger kvar i den.

I sverige kan den köpas från ett antal olika ställen den finns även på t.ex. Ebay mm. Det finns ett otal videos på YouTube som visar hur det fungerar.

Getting Teamviewer to work on Ubuntu 16.10

Teamviwer relies on a bunch of 32 bit dependencies you need to enable for it to install. This procedure should work:

sudo dpkg --add-architecture i386
sudo apt-get update
wget http://download.teamviewer.com/download/teamviewer_i386.deb
sudo dpkg -i --force-depends teamviewer_i386.deb
sudo apt-get install -f
sudo teamviewer --daemon start

I always suggest you take a snapshot before if your file system supports this just in case.

The World Sized Robot

I felt this needed to be shared with a broader audience. It may not be news to everybody but far from enough people understands we are just on the verge of something large happening.

We are building a world sized robot

Bruce Schneier writes in his latest CRYPTO-GRAM about something that has been bothering some people for a while as the implications are yet an undiscovered country. But his words are better than mine, so here goes:

We no longer have things with computers embedded in them. We have computers with things attached to them.

Your modern refrigerator is a computer that keeps things cold. Your oven, similarly, is a computer that makes things hot. An ATM is a computer with money inside. Your car is no longer a mechanical device with some computers inside; it’s a computer with four wheels and an engine. Actually, it’s a distributed system of over 100 computers with four wheels and an engine. And, of course, your phones became full-power general-purpose computers in 2007, when the iPhone was introduced.

We wear computers: fitness trackers and computer-enabled medical devices — and, of course, we carry our smartphones everywhere. Our homes have smart thermostats, smart appliances, smart door locks, even smart light bulbs. At work, many of those same smart devices are networked together with CCTV cameras, sensors that detect customer movements, and everything else. Cities are starting to embed smart sensors in roads, streetlights, and sidewalk squares, also smart energy grids and smart transportation networks. A nuclear power plant is really just a computer that produces electricity, and — like everything else we’ve just listed — it’s on the Internet.

The Internet is no longer a web that we connect to. Instead, it’s a computerized, networked, and interconnected world that we live in. This is the future, and what we’re calling the Internet of Things.

Broadly speaking, the Internet of Things has three parts. There are the sensors that collect data about us and our environment: smart thermostats, street and highway sensors, and those ubiquitous smartphones with their motion sensors and GPS location receivers. Then there are the ”smarts” that figure out what the data means and what to do about it. This includes all the computer processors on these devices and — increasingly — in the cloud, as well as the memory that stores all of this information. And finally, there are the actuators that affect our environment. The point of a smart thermostat isn’t to record the temperature; it’s to control the furnace and the air conditioner. Driverless cars collect data about the road and the environment to steer themselves safely to their destinations.

You can think of the sensors as the eyes and ears of the Internet. You can think of the actuators as the hands and feet of the Internet. And you can think of the stuff in the middle as the brain. We are building an Internet that senses, thinks, and acts.

This is the classic definition of a robot. We’re building a world-size robot, and we don’t even realize it.

To be sure, it’s not a robot in the classical sense. We think of robots as discrete autonomous entities, with sensors, brain, and actuators all together in a metal shell. The world-size robot is distributed. It doesn’t have a singular body, and parts of it are controlled in different ways by different people. It doesn’t have a central brain, and it has nothing even remotely resembling a consciousness. It doesn’t have a single goal or focus. It’s not even something we deliberately designed. It’s something we have inadvertently built out of the everyday objects we live with and take for granted. It is the extension of our computers and networks into the real world.

This world-size robot is actually more than the Internet of Things. It’s a combination of several decades-old computing trends: mobile computing, cloud computing, always-on computing, huge databases of personal information, the Internet of Things — or, more precisely, cyber-physical systems — autonomy, and artificial intelligence. And while it’s still not very smart, it’ll get smarter. It’ll get more powerful and more capable through all the interconnections we’re building.

It’ll also get much more dangerous.

— Bruce Schneier, cryptographer and computer security expert and educator, from his news letter CRYPTO-GRAM of february 15, 2017.

Borg Backup

The Borg

A very useful utility is the Borg Backup system, or just Borg. It’s a deduplicating backup system meaning that is scans the files and when it finds data that is already in the backup the data in the second and all other subsequent files are replaced with a reference to the first instance of that data.

The idea is that the same data is only stored once. All the backups you take after the initial one stores only the differences and the new data that has been accumulated since the last backup. This means that backing up after the initial backup is done is very fast, efficient, saves bandwidth and storage space.

Traditional backups have usually a full backup every month and then they take increments daily or so. If you need to restore a file you need to take the latest full backup, then apply each increment that was taken after. With the borg backup that is not necessary as you can view the file system exactly as it looked upon each and every backup point taken.

In fact you can mount the whole backup as a file system and then traverse it from there. It’s very effective. So let’s get started because face it, you don’t back up as much as you should do!

Borg can be used for multiple platforms but my commands here will be for linux.

The first step is to create a repository, this may sit on a different machine, NAS, attached USB drive or even on the same machine, of course you want multiple backups really so you can take the borg backup locally and then rsync it to as many locations as you feel is necessary.

Take the backup

The first step is to create the dir of the the backup repo and then we need to initialize it for being used with borg. This is quite simply done as:

$ sudo mkdir /bup
$ sudo borg init /bup

When the repository has thus been created it is time for the first initial backup. The format should be clear in a bit, it’s not complicated and can look like this:

$ sudo borg create --progress --info --stats /bup::lenovo-170202_163423 /home /root /boot /etc /var

The command above should be a single line. The first thing we give to borg is the command, in this case it is create to create a new backup set for us. Then we have some flags, –progress shows a progress indicator while borg is working that details also the number of bytes being read, backed, compressed and deduplicated. The next –info sets the information level borg presents to us and –stats lets borg summarize the operation with some statistics.

The next part of the command the /bup::lenovo-170202_163423 specifies the backup location and backup name. The name is given after the double colon :: mark. In this case its composed of the date yymmdd and time hhmmss of when the backup is started, doing that makes it easy to find the right set of data later when a restore is needed.

Why did I prefix it with lenovo? Well my main linux laptop is a lenovo and I also have other computers, like an ASUS laptop etc.  The beauty with deduplicating backups is that I backup multiple machines to the same repo. By doing that it will deduplicate across the machines and if I have the same files and data in multiple places it will just be replaced by references to the data that is already in the backup.

The final part of the command is just all paths I want to include in this backup. They can vary from time to time. I might backup /home daily but /root only once a week if I want. No problem at all with borg.

Restoring a backup

No system of backup is actually deployed before you have attempted and successfully retrieved data from it so that you know what to do in an emergency as well as being able to extract old data mistakenly erased or restore a full system after a hard drive crash.

Restoring a borg backup works a little different from what you may be used to. First of all you can of course extract the data fully or just single files if you know their paths just like with any other backup system. The restore command is called extract in borg.

$ sudo borg extract /bup::lenovo-170202_163423

This will extract the entire archive and then you can move the files into their respective locations. You can also extract for example only the etc folder from the archive:

$ sudo borg extract /bup::lenovo-170202_163423 etc

Extraction always writes in the current working directory. Therefore you should first extract then move the files into their correct location in your file system or if  all the backups are taken from the root of the file system / then you can cd there before extracting but I recommend extracting on a different volume first and then restoring from there. The reason is that there is usually a lot of stuff in a backup that you may not always want to restore.

Mounting the backup as a file system

So borg actually offers another way also. You can mount the backup as a volume, or you can mount the whole repo and see all the backup points made, select which one you want and then just copy the files from there to the live system.

$ sudo borg mount /bup::lenovo-170202_163423 /mnt

This will mount the backup lenovo-170202_163423 in the file system at /mnt. You can then cd to /mnt and then use cp etc to copy the files to their right places.

When done you can dismount it (otherwise other processes can’t backup, the repo is locked while mounted)

$ sudo umount /mnt

Borg uses fuserfs to mount local directories.

You may also mount the whole repository:

$ sudo borg mount /bup /mnt

Now when you go into the /mnt folder you will see all your backup names as directories:

$ ls
161204_040001 170101_203409 170113_040001 170117_040001 170121_040001 170125_010344 170128_030332
161206_040001 170108_040001 170114_040001 170118_040001 170122_214910 170125_040001 170128_040001
161218_174848 170111_040001 170115_040002 170119_040001 170123_040001 170126_040001 170129_040001
161225_040001 170112_040001 170116_040001 170120_040001 170124_040002 170127_040001 170201_082851

As you can see I generally name my backups with YYMMDD_HHMMSS just so it’s easy for me to find a specific date.

I can then cd to one of them

$ cd 170112_040001
$ ls
boot etc home root var vmlinuz vmlinuz.old

When done, don’t forget to unmount the archive as no new backups can be taken while it is mounted.

There you go. Start using.