Arch Linux

Can you please provide the output of `fc-match -s "Open Sans"`? I am suspecting the font fallback rules for your user profile.

└───╼ fc-match -s "Open Sans"
OpenSans-Regular.ttf: "Open Sans" "Regular"
DejaVuSans.ttf: "DejaVu Sans" "Book"
DejaVuSans-Bold.ttf: "DejaVu Sans" "Bold"
DejaVuSans-Oblique.ttf: "DejaVu Sans" "Oblique"
DejaVuSans-BoldOblique.ttf: "DejaVu Sans" "Bold Oblique"
verdana.ttf: "Verdana" "Regular"
arial.ttf: "Arial" "Regular"
l_10646.ttf: "Lucida Sans Unicode" "Regular"
tahoma.ttf: "Tahoma" "Regular"
msgothic.ttc: "MS Gothic" "Regular"
msyh.ttc: "Microsoft YaHei" "Regular"
msjh.ttc: "Microsoft JhengHei" "Normal"
ARIALUNI.TTF: "Arial Unicode MS" "Regular"
mingliub.ttc: "MingLiU-ExtB" "Regular"
consola.ttf: "Consolas" "Regular"
micross.ttf: "Microsoft Sans Serif" "Regular"
cambria.ttc: "Cambria" "Regular"
cambria.ttc: "Cambria Math" "Regular"
mvboli.ttf: "MV Boli" "Regular"
malgun.ttf: "Malgun Gothic" "Regular"
seguisym.ttf: "Segoe UI Symbol" "Regular"
calibri.ttf: "Calibri" "Regular"
msyi.ttf: "Microsoft Yi Baiti" "Regular"
phagspa.ttf: "Microsoft PhagsPa" "Regular"
taile.ttf: "Microsoft Tai Le" "Regular"
ntailu.ttf: "Microsoft New Tai Lue" "Regular"
segoeui.ttf: "Segoe UI" "Regular"
monbaiti.ttf: "Mongolian Baiti" "Regular"
himalaya.ttf: "Microsoft Himalaya" "Regular"
simsun.ttc: "SimSun" "Regular"
ebrima.ttf: "Ebrima" "Regular"
LeelawUI.ttf: "Leelawadee UI" "Regular"
simsunb.ttf: "SimSun-ExtB" "Regular"
DejaVuSerif.ttf: "DejaVu Serif" "Book"
holomdl2.ttf: "HoloLens MDL2 Assets" "Regular"
YuGothM.ttc: "Yu Gothic UI" "Regular"
segmdl2.ttf: "Segoe MDL2 Assets" "Regular"
Nirmala.ttf: "Nirmala UI" "Regular"
mmrtext.ttf: "Myanmar Text" "Regular"
gadugi.ttf: "Gadugi" "Regular"
javatext.ttf: "Javanese Text" "Regular"
seguihis.ttf: "Segoe UI Historic" "Regular"
seguiemj.ttf: "Segoe UI Emoji" "Regular"
Ubuntu-C.ttf: "Ubuntu Condensed" "Regular"
Ubuntu-R.ttf: "Ubuntu" "Regular"
impact.ttf: "Impact" "Regular"
DejaVuSerif-Italic.ttf: "DejaVu Serif" "Italic"
ter-x28n.pcf.gz: "xos4 Terminus" "Regular"
NotoColorEmoji.ttf: "Noto Color Emoji" "Regular"
symbol.ttf: "Symbol" "Regular"
webdings.ttf: "Webdings" "Regular"
mtextra.ttf: "MT Extra" "Regular"

Well, I can't reproduce.

removing ~/.local/share/TelegramDesktop and clean the fontconfig cache: same issue [1]

in log.txt

[2019.04.15 15:36:08] Launched version: 1006007, install beta: [FALSE], alpha: 0, debug mode: [FALSE], test dc: [FALSE]
[2019.04.15 15:36:08] Executable dir: /usr/bin/, name: telegram-desktop
[2019.04.15 15:36:08] Initial working dir: /etc/fonts/conf.avail/
[2019.04.15 15:36:08] Working dir: /home/sl1pkn07/.local/share/TelegramDesktop/
[2019.04.15 15:36:08] Command line: telegram-desktop
[2019.04.15 15:36:08] Executable path before check: /usr/bin/telegram-desktop
[2019.04.15 15:36:08] Logs started
[2019.04.15 15:36:08] Connecting local socket to /tmp/2de0c053765c718669683a79b4ecb2e4-{87A94AB0-E370-4cde-98D3-ACC110C5967D}...
[2019.04.15 15:36:08] This is the only instance of Telegram, starting server and app...
[2019.04.15 15:36:08] Moved logging from '/home/sl1pkn07/.local/share/TelegramDesktop/log_start0.txt' to '/home/sl1pkn07/.local/share/TelegramDesktop/log.txt'!
[2019.04.15 15:36:08] Primary screen DPI: 158.977
[2019.04.15 15:36:08] Could not load 'ayatana-appindicator3' with version 1 :(
[2019.04.15 15:36:08] Could not load 'appindicator3' with version 1 :(
[2019.04.15 15:36:08] Error: failed to load 'gdk_x11_drawable_get_xdisplay' function!
[2019.04.15 15:36:08] Getting DE, XDG_CURRENT_DESKTOP: 'KDE'
[2019.04.15 15:36:08] Getting DE, DESKTOP_SESSION: ''
[2019.04.15 15:36:08] Getting DE, KDE_SESSION_VERSION: '5'
[2019.04.15 15:36:08] DE: KDE5
[2019.04.15 15:36:08] Tray Icon: Try Qt = [TRUE], Prefer appindicator = [FALSE]
[2019.04.15 15:36:09] OpenAL Logging Level: (not set)
[2019.04.15 15:36:09] Audio Playback Devices: OpenAL Soft
[2019.04.15 15:36:09] Audio Playback Default Device: OpenAL Soft
[2019.04.15 15:36:09] Audio Capture Devices: Audio Interno Estéreo Analógico;Monitor of Audio Interno Estéreo Analógico
[2019.04.15 15:36:09] Audio Capture Default Device: Audio Interno Estéreo Analógico

my /etc/fonts/conf.avail/

└───╼ LC_ALL=C pacman -Qo /etc/fonts/conf.avail/*
/etc/fonts/conf.avail/09-texlive-fonts.conf is owned by texlive-core 2018.50036-1
/etc/fonts/conf.avail/10-autohint.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-hinting-full.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-hinting-medium.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-hinting-none.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-hinting-slight.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-no-sub-pixel.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-scale-bitmap-fonts.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-sub-pixel-bgr.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-sub-pixel-rgb.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-sub-pixel-vbgr.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-sub-pixel-vrgb.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/10-unhinted.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/11-lcdfilter-default.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/11-lcdfilter-legacy.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/11-lcdfilter-light.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/20-unhint-small-dejavu-sans.conf is owned by ttf-dejavu 2.37-2
/etc/fonts/conf.avail/20-unhint-small-dejavu-sans-mono.conf is owned by ttf-dejavu 2.37-2
/etc/fonts/conf.avail/20-unhint-small-dejavu-serif.conf is owned by ttf-dejavu 2.37-2
/etc/fonts/conf.avail/20-unhint-small-vera.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/25-unhint-nonlatin.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/30-metric-aliases.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/40-nonlatin.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/45-generic.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/45-latin.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/49-sansserif.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/50-user.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/51-local.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/57-dejavu-sans.conf is owned by ttf-dejavu 2.37-2
/etc/fonts/conf.avail/57-dejavu-sans-mono.conf is owned by ttf-dejavu 2.37-2
/etc/fonts/conf.avail/57-dejavu-serif.conf is owned by ttf-dejavu 2.37-2
/etc/fonts/conf.avail/60-generic.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/60-latin.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/65-fonts-persian.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/65-khmer.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/65-nonlatin.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/69-unifont.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/70-no-bitmaps.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/70-yes-bitmaps.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/75-yes-terminus.conf is owned by terminus-font 4.47-2
/etc/fonts/conf.avail/80-delicious.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1
/etc/fonts/conf.avail/81-ubuntu.conf is owned by ttf-ubuntu-font-family 0.83-4
/etc/fonts/conf.avail/90-synthetic.conf is owned by fontconfig 2:2.13.1+12+g5f5ec56-1

cheksum cheker

└───╼ LC_ALL=C pacman -Qkk fontconfig texlive-core ttf-dejavu terminus-font ttf-ubuntu-font-family
fontconfig: 560 total files, 0 altered files
backup file: texlive-core: /etc/texmf/web2c/fmtutil.cnf (Modification time mismatch)
backup file: texlive-core: /etc/texmf/web2c/fmtutil.cnf (Size mismatch)
texlive-core: 26198 total files, 0 altered files
ttf-dejavu: 45 total files, 0 altered files
terminus-font: 254 total files, 0 altered files
ttf-ubuntu-font-family: 26 total files, 0 altered files

my ~/.config/fontconfig/fonts.conf

<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<!-- created by lxqt-config-appearance (DO NOT EDIT!) -->
<fontconfig>
<match target="font">
<edit name="lcdfilter" mode="assign">
<const>lcddefault</const>
</edit>
</match>
<match target="font">
<edit name="autohint" mode="assign">
<bool>true</bool>
</edit>
</match>
<match target="pattern">
<edit name="dpi" mode="assign">
<double>157</double>
</edit>
</match>
<dir>~/.fonts</dir>
<match target="font">
<edit name="hinting" mode="assign">
<bool>true</bool>
</edit>
</match>
<match target="font">
<edit name="hintstyle" mode="assign">
<const>hintslight</const>
</edit>
</match>
<match target="font">
<edit name="rgba" mode="assign">
<const>rgb</const>
</edit>
</match>
<match target="font">
<edit name="antialias" mode="assign">
<bool>true</bool>
</edit>
</match>
</fontconfig>

any other file i need check?

[1] https://i.ibb.co/CsBXKPm/Screenshot-20190415-155044.png

greetings

Do other qt applications look fine?

any of them that I use daily

example: https://i.ibb.co/CQ662qH/Screenshot-20190415-170709.png

i have save in cache a lot of older versions of telegram-desktop. i can "bisect" which one is starting to have problems

EDIT: the older version i have is telegram-desktop-1.5.4-1-x86_64.pkg.tar.xz and have the same issue :S

Not sure what to do here. I have never seen this particular issue on my systems and if we don't get a good hint as to what might be causing it, I'm not sure there's merit to tracking this bug.

Building the package in local machine(downloaded with asp, builded with makepkg), without chroot, and the issue is gone :/

the one thing i have Qt from kde-unstable (5.13.0beta1). maybe is this the culprit?

greetings

That can definitely be a cause. Please try this against stable Qt and report results.

sorry the late

downgrade to extra/qt5-foo, build telegram desktop and install, update all qt5-foo again, launch telegramn, and back to have the same issue

it's definitely Qt's problem

seems needs rebuild if use Qt from [kde-unstable] repo

greetings