klingtnet

How to run melodics on Linux using Wine

• Don't know what Melodics is? Watch this great introduction by Slynk
• Download Melodics
• I had audio glitches so I had to run the application like this:

export PULSE_LATENCY_MSEC=5\
    && export WINEPREFIX="/home/alinz/.wine"\
    && wine "$USER/.wine/dosdevices/c:/Program Files/Melodics/Melodics.exe"

klingtnet

Restoring backups with rclone that are stored as [C14/Glacier cold storage][glacier] on Scaleway will fail with Failed to copy: failed to open source object: AccessDenied: Access Denied..

# create backup
$ rclone --s3-storage-class=GLACIER sync backup/ scaleway-encrypted:
...
# try to restore
$ rclone --s3-storage-class=GLACIER sync scaleway-encrypted: backup/
Failed to copy: failed to open source object: AccessDenied: Access Denied.
...

klingtnet

• Blacklist firewire sound kernel modules to prevent ALSA and PulseAudio from managing them by creating a file like /etc/modprobe.d/blacklist-snd-firewire.conf:

# This fixes the usage of firewire soundcards with Jack by
# preventing ALSA from handling the device.
# Only modules used for the Edirol FA-66 are blacklisted.
#
# For details refer to:
# https://wiki.archlinux.org/index.php/JACK_Audio_Connection_Kit
# https://github.com/takaswie/snd-firewire-improve/blob/315dcdc4e430d44a6e109a015beecb8515fbe634/sound/firewire/Kconfig

klingtnet

The instructions were tested on a Lenovo X1 Carbon 5th Gen (X1C5) on Arch Linux but should be applicable to other Lenovo models and Linux distributions.

BACKUP YOUR DATA! I created a bootable Ubuntu Image like this:

$ sudo sh -c 'curl --location --silent --fail "http://releases.ubuntu.com/18.04/ubuntu-18.04.1-desktop-amd64.iso" | pv > /dev/<your-usb-drive>'
# note that pv is only there to show progress, it is perfectly fine to redirect curl to the usb drive directly.

then I booted from this drive by pressing F12 on reboot and dumped my NVMe disk to an external hard drive like this:

klingtnet

How to switch from GRUB2 to systemd-boot (Arch Linux)

$ sudo su
$ bootctl install
$ cat <<EOF>/boot/loader/loader.conf
#https://wiki.archlinux.org/index.php/Systemd-boot#Configuration

# menu timeout
timeout 3

klingtnet

This guide is based on the hibernate article from the Arch wiki.

• edit /etc/default/grub and add resume as well as resume_offset kernel parameters
  • resume=UUID=abcd-efgh contains the UUID of the partition on which the swapfile resides. In most cases the swapfile resides in root, to identify the root parition's UUID run blkid or lsblk -O.
  • resume_offset=1234 is the offset of the swapfile from the partition start. The offset is the first entry in the physical_offset column of the output of filefrag -v /swapfile.
  • update grub: grub-mkconfig -o /boot/grub/grub.cfg
  • example: GRUB_CMDLINE_LINUX_DEFAULT="resume=UUID=75972c96-f909-4419-aba4-80c1b74bd605 resume_offset=1492992"
• add the resume module hook to /etc/mkinitcpio.conf:
  • HOOKS="base udev resume autodetect ...
• rebuild the initramfs mkinitcpio -p linux

klingtnet

• Most information was taken from the [release notes].
• Release is schedules for February 2023. Releases happened between 16th and 25th in the past, so I assume that 1.20 will be released end of February as well.

---

Context

Package context received WithCancelCause which allows to cancel a context with a given error. This is pretty nice to have something more meaningful than the usual context.Canceled error, that won't tell you anything about why something got canceled. (playground)

Errors

klingtnet

My Ryzen 7 3700X desktop machine had random reboots when in idle. Stress tests worked fine over many hours, no problem there. There's a Gentoo Wiki entry that recommends to set idle=nomwait and processor.max_cstate=5. For me, it did not work and neither did the tips from this kernel Bug report. Those random reboots disappeared after I reset my BIOS to optimized factory defaults. The only change I apply to those factory defaults is to apply the XMP profile of memory modules. It turned out that, if the XMP settings were applied, the random reboot appeared again. Luckily i stumbled over this linustechtips forum thread where someone said that power down mode needs to be disabled. Someone else said that they fixed this issue by setting the RAM voltage to 1.36V instead of 1.35V. Anyways, disabling _power down mod

klingtnet

Those are the only instructions I need to run to have a fully working Pipewire setup that is compatible with PulseAudio, Jack and ALSA:

$ yay -Rcns pulseaudio-jack
# note that pipewire-jack-dropin is an AUR package
$ yay -S pipewire-{jack,jack-dropin,alsa,pulse}
$ systemctl --user enable pipewire pipewire-pulse pipewire-media-session
$ systemctl reboot
# done

klingtnet

How to remove bloatware from android without root using adb only

1. Make sure that USB debugging is enabled.
2. Deactivate all bloatware apps.
3. List the names of all deactivated packages:

$ adb shell pm list packages -d