dx9s.net

A home for dx9s in the interwebs

Not sure why, but there seems to be a lot of issues with gnome and app indicators (think system tray)..

So far this seems to work, but as it is a bit of voodoo, haven't tested it often.. (or at least some combination involving the following):

$ sudo apt purge gnome-shell-extension-appindicator indicator-common indicator-application

reboot / Alt-F2 'r'

gnome-tweaks -> extensions. make sure everything is disabled

reboot / Alt-F2 'r'

Ubuntu Software -> Add-Ons -> Shell Extensions -> Topicons plus (install)

reboot /Alt-F2 'r'

/etc/udev/rules.d$ cat 99-CHProducts.rules
KERNEL=="event*", ATTRS{idProduct}=="00f2", ATTRS{idVendor}=="068e", MODE="0666"
KERNEL=="event*", ATTRS{idProduct}=="00f3", ATTRS{idVendor}=="068e", MODE="0666"

I removed swap (/etc/fstab) from a machine a while ago, but the system was still activating the partition. Come to find out systemd.special/swap.target was still mounting it some how **OR** initramfs .. (still not entirely sure).

So if I remove the swap partition, it CAN'T activate it.. GREAT only except the machine now takes a really long time (~44 seconds) to boot when it was booting in about half that (~25 seconds) before that. WHAT THE HECK?!

The git project contains quick checks (scans) on ways to improve system stability when it comes to low latency and real-time applications. This can improve jack to where the buffer size can be as low as 128x2 for USB class 2 audio hardware using a pre-compiled low-latency kernel. Should be lower (64x2?) for a custom compiled real-time kernel.. Otherwise using standard kernel you might still have issues at 1024x2 with a busy system.

See:
git clone https://github.com/raboof/realtimeconfigquickscan.git

Pulseaudio notes:

https://askubuntu.com/questions/680817/jack-and-pulseaudio-multiple-sink...

Shows how to create multiple sinks and sources (with the jack/pulse module) so you can point things like Discord or Skype or whatnot at jack uniquely

Been fairly happy with the new features in 15 Beta 1... Beta 2 is apparently out:

https://forum.blackmagicdesign.com/viewtopic.php?f=21&t=56878&sid=e86102...

## x.sh
xrandr --output DP-0 --scale-from 1920x1080 #--scale 0.5x0.5

## y.sh
xrandr --output DP-0 --scale-from 2560x1440

## z.sh
xrandr --output DP-0 --scale 1x1

Looks like the logic inside modern Intel CPUs are too aggressive in pre-loading cache data and forget to check security boundaries... loading data from kernel (or possible other code space) into a region that malicious code could have access too:

https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/

Good starting links for learning about dithering:

Remapping channels to/from other devices (examples): (remember pacmd)
# from XR18 to OSB (inputs)
load-module module-remap-source channels=2 [...]