After updating the system

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imagemagick (7.0.11.10-1 -> 7.0.11.11-1)
libass (0.15.0-2 -> 0.15.1-1)
linux (5.11.16.arch1-1 -> 5.12.1.arch1-1)
linux-firmware (20210315.3568f96-2 -> 20210426.fa0efef-1)
linux-headers (5.11.16.arch1-1 -> 5.12.1.arch1-1)
sddm (0.19.0-5 -> 0.19.0-6)

I do not see letters. Plasma is wrong. Windows work well.
Screen shots
https://ibb.co/gMrmfb7
https://ibb.co/TL8T4Qp

Where is the reason?

Are your font settings default?
Does it work correctly under the previous kernel?
What is your exact Plasma version?
Graphic card and driver?

Mamarok wrote:Are your font settings default?

Yes

Mamarok wrote:Does it work correctly under the previous kernel?

I made ↓

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pacman -U linux-5.12.1.arch1-1-x86_64.pkg.tar.zst linux-headers-5.12.1.arch1-1-x86_64.pkg.tar.zst
pacman -U https://archive.archlinux.org/packages/l/linux-firmware/linux-firmware-20210315.3568f96-2-any.pkg.tar.zst

And there was a mistake

On April 30, I made a backup system to the "dd" command. I restored the system. Then I updated the system ↓

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pacaur -Syyu --devel --ignore=linux --ignore=linux-firmware --ignore=linux-headers

I excluded the "linux" and "linux-headers" packages from updating, because I feel something that are associated with "linux-firmware".

Mamarok wrote:What is your exact Plasma version?
Graphic card and driver?

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plasmashell --version && kf5-config --version
plasmashell 5.21.5
Qt: 5.15.2
Szkielety KDE: 5.82.0
kf5-config: 1.0

I have four "NVIDIA NVS 310 GPU"

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xf86-video-nouveau xf86-video-vesa xf86-video-fbdev