Working Ninja

I have been setting up some RESTful sensors for Home Assistant and to verify/fine tune their functionality, it dawned on me that I could use watch to continuously poll my endpoint to watch for a value change:

watch curl --no-progress-meter http://domain.tld/path/to/sensor/

If you're familiar with watch, you'll know that the default "polling rate" will be every 2 seconds. This can be altered by passing in the option -n x, where "x" is the number of seconds you'd like between command runs.


After upgrading to Linux kernel 5.4.0-54-generic, I was unable to adjust my display brightness.

dmesg output shows i915 'Y' invalid for parameter 'enable_dpcd_backlight'

/etc/default/grub contains i915.enable_dpcd_backlight=Y for GRUB_CMDLINE_LINUX_DEFAULT.

Removing the i915.enable_dpcd_backlight=Y from GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub resolved the issue.


A while back, I found that my iDRAC firmware was out of date. Being a good sysadmin, I downloaded the update and followed the instructions to perform the update via the iDRAC itself. Being a while back, I don't remember exactly what transpired but the update failed in one way or another. Upon rebooting the server, my fans were running full throttle and I was unable to connect to the iDRAC.

I did some sleuthing on the Internet and found another poor soul with a similar issue. His solution was to perform a recovery of the iDRAC via a serial connection to the iDRAC and a TFTP server to serve the firmware.



lirc mysteriously stopped working when I upgraded to kernel 4.19.66-v7+ on my Raspberry Pi a while back. After an initial battle that lead to no success, I let it collect dust until this fateful night when she returned to her full functionality.


The kernel module lirc_rpi has been replaced with two modules: gpio_ir_recv (for receiving) and gpio_ir_tx (for sending, naturally). There are handful of configurations that need to point to and load the new modules.

My setup

  • GPIO 22 for IR transmission.
  • lircd 0.9.4c
  • kernel 4.19.66-v7+
  • Raspbian GNU/Linux 9 (stretch)


Replace lirc-rpi with gpio-ir-tx. Take note that gpio_out_pin is now gpio_pin (see /boot/overlays/README for more info [search for gpio-ir-tx]).



Replace loading of lirc_rpi with gpio_ir_tx.



Remove lirc_* in /etc/modules (or comment out).

lirc_rpi gpio_out_pin=22


I had my remote configurations in lircd.conf and the upgrade to kernel 4.19. These were blown away, unfortunately. Fortunately, I had copies elsewhere. The new lircd.conf contains a single line that loads in all .conf files in /etc/lirc/lircd.conf.d/. I copied my remote conf files here and called it good (just in case another update blows things away =]


This file was unnecessary for my setup so I renamed it so it would not be loaded. See /etc/lirc/lircd.conf.d/README.conf.d for more info.

mv devinput.lircd.conf devinput.lircd.conf.dist

Extra Help:

  • If you need IR receive functionality, the dtoverlay will be gpio-ir (and not gpio-ir-recv, like the module). See /boot/overlays/README for more information. Also see modinfo gpio-ir-recv and modinfo gpio-ir-tx for more info.

Add the following to your ~/.bash_profile for simple merging of PDFs:

pdfmerge() { 
    gs -dPDFSETTINGS=/prepress -dBATCH -dNOPAUSE -sDEVICE=pdfwrite -sOutputFile=$@


pdfmerge merged.pdf first.pdf second.pdf



I recently ran into a situation where I needed to copy some CSV data residing on a Windows machine to a Linux machine. The remote desktop client software I was using (on my Linux machine) wasn't set up to nativiely allow copy and paste to and from the server. It just so happened that I was recently working with netcat and thought this would be a great way to send the data to my destination machine. Sadly, Windows does not include netcat, so I dug around a bit and found that telnet would be able to take its place. So with a tool to use on both the sending and receiving side of things, I set out to implement what I'm calling "'universal' copy and paste".

So on my Linux machine (destination), I set up the netcat to listen on port 1234:

netcat -l 1234

On the Windows machine (source), I used telnet to connect to my Linux machine on port 1234, like so:

telnet 1234

I could then paste the CSV data on my Windows machine and it would immediately start outputting on my Linux machine. Ta-da, simple and "universal" copy and paste.

Finally, I would be remis if I did not mention that--while this is a working approach--it is not a secure one. The connection is not encrypted so everything is transmitted in clear-text.


First, list the shares available from the server:

smbclient -L <server> -U <user>

Next, make sure cifs-utils is available (so we can pass in the credentials option):

sudo apt install cifs-utils

Finally, add the desired share to /etc/fstab:

//ip/share /mnt/point cifs vers=3,credentials=/path/to/credentials,noexec 0 0

The following example looks for the "idle" time before backlight brightness is reduced.

Find what you're looking for:

gsettings list-recursively | grep idle

Get the value:

gsettings get org.gnome.settings-daemon.plugins.power idle-brightness

Set the value:

gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 120



Give your hand some relief from reaching for Ctrl and take advantage of the close proximity of Caps Lock.

# Note any previous values for xdb-options (most likely none)
gsettings get org.gnome.desktop.input-sources xkb-options

# Set our xkb-options (plus anything from our get, if needed)
gsettings set org.gnome.desktop.input-sources xkb-options "['ctrl:nocaps']"

Now to retrain your brain ;)



Completely disable systemd power-saving modules:

sudo systemctl mask

Disable systemd lid switch (for laptops):

sed -i -e 's/HandleLidSwitch=suspend/HandleLidSwitch=ignore/' /etc/systemd/logind.conf

The above became necessary as systemd-logind was detecting that the lid was closed and calling The calls were numerous and consumed large amounts of CPU.

Sources: and