TP-Link Archer T9UH v1 [Realtek RTL8814AU] driver

 TP-Link Archer T9UH v1 [Realtek RTL8814AU] driver is at https://github.com/aircrack-ng/rtl8814au.git

Thinkbook 13s ITL G2 headphones hissing sound, noise fix

Kubuntu 20.04 LTS

Problem: wired headphones reproduce constant hissing sound, noise changes with the cursor movement etc.

Solution:

 sudo hda-verb /dev/snd/hwC0D0 0x1d SET_PIN_WIDGET_CONTROL 0x0

 

Sources:

https://www.reddit.com/r/thinkpad/comments/8j8208/audio_crackling_through_both_headphone_jack_and/

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/comments/20

 

Thinkbook 13s G2 ITL battery conservation mode in Linux

 https://wiki.archlinux.org/title/Laptop/Lenovo#Battery_Conservation_Mode_on_IdeaPad_laptops

echo 1 >/sys/bus/platform/drivers/ideapad_acpi/VPC2004:00/conservation_mode

 

Skyrim Special Edition steam fix

Launch options to fix sound issue:

 WINEDLLOVERRIDES="xaudio2_7=n,b" %command%

 

https://github.com/ValveSoftware/Proton/issues/289

Digikam settings

  Set photos and db location on first start to ~/Pictures/digikam-photos
 Configure digikam:
 Metadata page:
    Behaviour:
        Write this information to the Metadata:
            Image tags
            Rating
            Pick label
        Reading and writing metadata:
            Update file modification timestamp when files are modified
            Rescan file when files are modified
    Sidecars:
        Read from sidecar files
        Write to sidecar files
            Write XMP sidecar only
    Rotation:
        Rotate by only setting a flag

Luks partitioning

 Partition Table: gpt
Disk Flags:  

Number  Start   End    Size   File system  Name  Flags
1      1049kB  211MB  210MB  fat32              boot, esp
2      211MB   735MB  524MB  ext4               legacy_boot
3      735MB   512GB  511GB

Partition 1 mount point = /boot/efi

Partition 2 mount point = /boot

Partition 3 = luks

GRUB string:

sudo vim /etc/default/grub

linux   /vmlinuz-5.12-x86_64 root=UUID=xxx-uuid-of-root-ext4-fs-xxx rw  quiet cryptdevice=UUID=luks-partition-uuid:mapped-to-name:allow-discards root=/dev/mapper/mapped-to-name udev.log_priority=3 rd.luks.options=discard

update-grub

fix sddm (kde mankaro) keyboard layout on unlock

 /usr/share/sddm/scripts/Xsetup

 

#!/bin/sh
# Xsetup - run as root before the login dialog appears

setxkbmap us
 

Fix SDDM keyboard layout for password (KDE Manjaro)

 sudo vim /usr/share/sddm/scripts/Xsetup

setxkbmap us

 

Text templates, code generation

 Python: wheezy.template

@def indent(lines, sep):
@sep.join(lines.split('\n'))
@end

@def body():
function body;
statement2;
@end

@def func(name):
    func @name {
        @body()
        @indent('1\n2\n3\n', '\n        ')
        @indent(body(), '\n        ')
    }
@end


@func('hello')

Java: StringTemplate4

Compare directories GUI

 KDiff3

https://apps.kde.org/en/kdiff3

gpg encryption/decryption

Encrypt:

 gpg --no-symkey-cache -c cd2.iso

Decrypt:
 gpg --no-symkey-cache -o cd2.iso -d cd2.iso.gpg

Old dos/windows archive files decompression with correct file names

 unar -o temp -encoding cp866 my-old-arch.zip

Thoughts on photo/video files organizing

Directory structure pattern: "YYYY/YYYY-MM-DD-tag1-tag2/xxxxx.jpg"

Should the files be renamed on copying from the camera? If necessary rename only once -- before working with the files, importing them into darktable/digikam.

Do not use stars, flags, color labels, use text tags instead, store tags in .xmp files.

Use two tags like "edit" and "edit-TIMESTAMP" when tagging photos for a special temporary/one-time task like "print" and "print-20200109"... Keep those tags to track history.

Tag photos as "printed", "shared", "published", and with a the same word but with a timestamp "printed-20200109" etc. 

Tag photos to delete with "delete" tag, rather than using digikam's delete function.

Put videos into a subdirectory.

Mark for culling: 

Certain to keep: "pick-best" > "pick-good" > "pick-keep" 

Tentative: "pick-uncertain" > "pick-bad" > "pick-delete"

Julia programming language notes

 julialang.org

https://docs.julialang.org/en/v1/manual/unicode-input/

https://benlauwens.github.io/ThinkJulia.jl/latest/book.html

 

Documentation is not clear,  big memory footprint (125MB RAM), slow to start first time on Windows.

The language is dynamic, no way to specify exactly function arguments and return value for a type (e.g. as a type of an argument to another function, or a type of a variable holding a function object).

An error can be spotted only during execution, e.g. if the return type does not match the type of the expression returned from the function.

Manjaro/archlinux drive encryption notes

https://wiki.archlinux.org/index.php/Dm-crypt/System_configuration

Need to have normal ext4 boot partition, vfat EFI partition, and an encrypted partition. 

Kernel boot image must have dmcrypt support:

/etc/mkinitcpio.conf

...


HOOKS=(base udev autodetect keymap modconf block encrypt filesystems keyboard fsck)

...

/etc/default/grub:
GRUB_CMDLINE_LINUX="cryptdevice=UUID=88.-..888:cryptroot:allow-discards"




/etc/fstab: 

# /dev/mapper/cryptroot
UUID=111-11-...       /               ext4            rw,noatime      0 0

# /dev/nvme0n1p6
UUID=222-22-...       /boot           ext4            rw,relatime     0 0

# /dev/nvme0n1p2
UUID=333..          /boot/efi       vfat            rw,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro
      0 0