Pi In The Sky
Simply a work area and/or catch-all for miscellaneous Raspberry Pi tips, tricks, tools, tweaks, research or harebrainers - most-likely a mess, but possibly useful to others. Initially weeding through remaining Raspberry Pi info @ ventures.tpedersen.net/errata/raspberrypi to salvage potentially useful info.
Putting Raspberry Pi Monitor to Sleep (DPMS). HowTo: Turn OFF RPi Monitors (backlight too!)
RPI 4 No HDMI Output
Oct 2021: First RPI Hardware issue?! SmartiePi RPI4 board from June 2021 has lost ability to emit HDMI signal. Runs fine if I SSH into it, but cannot get HDMI output to save my life! Pi has been used headless for past 6 months or so. When reconnected to HDMI there is NO signal/output.
22 October: FIXED! It was the damn CASE! NO hdmi cable or adapter would work (and I tested a quite a few!). Finally removed the case and POOF! The cable clicked in a nano farther and it came right up! VERY bizarre, RPI 4B was mounted in that case the day it arrived, worked fine right out of the box! I can also see the case is no longer available on Amazon.
Others w/ similar issues
Firmware could do this? https://github.com/raspberrypi/firmware/issues/1548. Have now worked with fresh SD/OS, updated/upgraded everything including eeprom. https://jamesachambers.com/raspberry-pi-4-bootloader-firmware-updating-recovery-guide/
Check for Installable or Installed packages
Find a specific package via apt-cache search <package>
List of ALL installed packages (pipe to grep or page thru) via dpkg -l
SSH: Remove offending key when a IP is reused
Regular Expression (Regexp) Stuff
I will always need all the help I can get here ....
Regular Expression Analyzer @ http://xenon.stanford.edu/~xusch/regexp/
Regexp builder @ https://regexbuildertool.com/
Interesting Regexp Generator @ https://regex-generator.olafneumann.org
Stuff to Research
WiFi Bootstrap - how to config WiFi when Headless & Disconnected
I often make Pi's for others - pre-configuring them for WiFi in someone else's home is a pain in the drain
Simply a bookmark collection at this point ...
WiFi Boostrap @ https://davesteele.github.io/comitup/.
<more to come here>