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Monat: August 2018

Ghost / unknown flying object (FPV Freestyle Double Feature)

I uploaded a new video onto the Tube, it’s called „Ghost / unknown flying object“.

I liked picking up the idea of a double feature, which is movie enthusiast slang nowadays, but used to be quite common: You pay once, and get to see two movies (two features).

It’s mainly footage from my Mallorca trip in 2018, the intro is me chasing Sean’s wing in Hallstadt, Germany. It’s not related to Mallorca, just thought to myself it makes for a good opening. Well, now that i think about it, that sesh was the last time I went flying before going on that plane, so it kinda has its place there at the beginning.

So, without further ado: Enjoy and please subscribe!

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Installing Brother DCP Scanner Drivers in Ubuntu

Start a Terminal using CTRL+ALT+T. Install some depencencies and frontend scanner tools using

sudo apt-get install xsane sane-utils simple-scan lib32stdc++6

Now download the drivers. In case brother loses them, I mirrored them here. Alternatively use the wget commands down below.

wget http://download.brother.com/welcome/dlf006646/brscan4-0.4.4-4.i386.deb -O brscan4-0.4.4-4.i386.deb
wget http://download.brother.com/welcome/dlf006651/brscan-skey-0.2.4-1.i386.deb -O brscan-skey-0.2.4-1.i386.deb
wget http://download.brother.com/welcome/dlf006654/brother-udev-rule-type1-1.0.2-0.all.deb -O brother-udev-rule-type1-1.0.2-0.all.deb

Now install the drivers you just downloaded:

sudo dpkg -i –force-architecture brscan.deb brother-udev-rule.deb

And restart your udev service:

sudo systemctl restart udev.service

All i had to do was unplug and plug in my DCP, and i could immediately scan using simple-scan in Gnome.

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Asus ZenBook 13 (UX331UN) with Ubuntu: Battery drain while in suspend

When i got my shiny new ZenBook 13 UX331UN in July, i immediately wiped it and installed Ubuntu 18.04 (Bionic Beaver).

But I soon realized something was wrong with suspend: The laptop would go to sleep and over night the battery would either almost (10-ish percent) or completely drain, leaving the laptop completely powered off.

On other laptops the suspend state would eat about 5% charge per day, leaving you able to suspend around 3 weeks in theory, but something was using the battery in suspend here.

Here’s the problem analysis:

Suspend your laptop. Wake it up again. Now check the output of

sudo journalctl | grep „PM: suspend“ | tail -2

May 13 18:41:00 mex kernel: PM: suspend entry (s2idle)
May 13 20:52:36 mex kernel: PM: suspend exit

If you end up with 

Your laptop is only entering „s2idle“ sleep (which is basicallynot saving much more than with blanking out screen and disabling the network). What we really want instead is the „deep“ sleep.

You can also check

cat /sys/power/mem_sleep

which yields

[ s2idle] deep

meaning the s2idle state is active in standby, because it’s written in brackets.

The permanent fix:

Edit your grub bootloader config to add a parameter to your Linux kernel when it boots. Type

sudo gedit /etc/default/grub

and replace the line GRUB_CMDLINE_LINUX_DEFAULT=“quiet splash“ with

GRUB_CMDLINE_LINUX_DEFAULT=“quiet splash mem_sleep_default=deep“

Save the file and exit. Now run

sudo update-grub && sudo reboot

To apply the changes and reboot. Test. Done.

IMPORTANT: If you now have troble waking your laptop up, DO NOT USE THE NVIDIA DRIVERS. They suck. Use noveau.

EDIT: The above works and is tested, but i now have the problem that the laptop won’t resume when on battery. When it’s on power supply it can resume. Any ideas!?

EDIT: You’re  not alone: https://bugzilla.kernel.org/show_bug.cgi?id=201307 and https://askubuntu.com/questions/1071855/ubuntu-18-04-does-not-wake-up-from-suspend-on-asus-zenbook

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amt@cvtwikzre.profi-aller-klassen.de