diff --git a/os/linux/README.md b/os/linux/README.md
index 204305785..c64845f19 100644
--- a/os/linux/README.md
+++ b/os/linux/README.md
@@ -69,6 +69,213 @@ acpi=off
 https://forum.garudalinux.org/t/cant-boot-on-integrated-radeon-gpu/14890
 radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1 amdgpu.cik_support=1 modprobe.blacklist=radeon
 
+* https://wiki.astralinux.ru/pages/viewpage.action?pageId=1212473
+
+## initramfs
+
+* https://wiki.astralinux.ru/pages/viewpage.action?pageId=1212473
+
+/etc/modprobe.d/blacklist.conf
+...
+blacklist radeon
+options radeon modeset=0
+
+initramfs-tools:
+    /etc/initramfs-tools/conf.d
+    /etc/initramfs-tools/update-initramfs.conf
+    /etc/kernel/postinst.d/initramfs-tools
+    /etc/kernel/postrm.d/initramfs-tools
+    /usr/sbin/update-initramfs
+    /usr/share/lintian/overrides/initramfs-tools
+    /usr/share/man/man5/update-initramfs.conf.5.gz
+    /usr/share/man/man8/update-initramfs.8.gz
+
+```
+$ cat /etc/initramfs-tools/modules 
+# delete line
+radeon modeset=1
+```
+```
+$ update-initramfs -u -k all
+```
+
+```
+$ tree /etc/initramfs-tools
+/etc/initramfs-tools/
+    conf.d/
+        calamares-safe-initramfs.conf
+        cryptsetup
+    hooks/
+    initramfs.conf
+    modules
+    scripts/
+        init-bottom
+        init-premount
+        init-top
+        local-bottom
+        local-premount
+        local-top
+        nfs-bottom
+        nfs-premount
+        nfs-top
+        panic
+    update-initramfs.conf
+```
+
+```
+$cat /usr/sbin/update-initramfs
+...
+BOOTDIR=/boot
+CONF=/etc/initramfs-tools/update-initramfs.conf
+...
+get_sorted_versions()
+{
+	version_list="$(
+		linux-version list |
+		while read -r version; do
+		      test -e "${BOOTDIR}/initrd.img-$version" && echo "$version"
+		done |
+		linux-version sort --reverse
+		)"
+	verbose "Available versions: ${version_list}"
+}
+
+set_current_version()
+{
+	if [ -f "/boot/initrd.img-$(uname -r)" ]; then
+		version=$(uname -r)
+	fi
+}
+...
+# Invoke bootloader
+run_bootloader()
+{
+	# invoke policy conformant bootloader hooks
+	if [ -d /etc/initramfs/post-update.d/ ]; then
+		run-parts --arg="${version}" --arg="${initramfs}" \
+			/etc/initramfs/post-update.d/
+		return 0
+	fi
+}
+...
+```
+
+## modprobe
+
+kmod: /etc/modprobe.d/blacklist.conf
+
+tree /etc/modprobe.d
+/etc/modprobe.d
+├── alsa-base.conf
+├── blacklist-ath_pci.conf
+├── blacklist.conf
+├── blacklist-firewire.conf
+├── blacklist-framebuffer.conf
+├── blacklist-modem.conf
+├── blacklist-oss.conf -> /lib/linux-sound-base/noOSS.modprobe.conf
+├── blacklist-radeon.conf
+├── blacklist-rare-network.conf
+├── dkms.conf
+└── iwlwifi.conf
+
+
+$ dpkg -L kmod
+/etc/depmod.d/ubuntu.conf
+/etc/init.d/kmod
+/etc/modprobe.d/blacklist-ath_pci.conf
+/etc/modprobe.d/blacklist-firewire.conf
+/etc/modprobe.d/blacklist-framebuffer.conf
+/etc/modprobe.d/blacklist-rare-network.conf
+/etc/modprobe.d/blacklist.conf
+/etc/modprobe.d/iwlwifi.conf
+/usr/bin/kmod
+/usr/lib/modprobe.d/aliases.conf
+/usr/sbin
+/usr/share
+/usr/share/bash-completion/completions
+/usr/share/bash-completion/completions/kmod
+/usr/share/doc/libkmod2/README.md
+/usr/share/doc/libkmod2/TODO
+/usr/share/initramfs-tools/hooks/kmod
+/usr/share/man/man5/depmod.d.5.gz
+/usr/share/man/man5/modprobe.d.5.gz
+/usr/share/man/man5/modules.dep.5.gz
+/usr/share/man/man8/depmod.8.gz
+/usr/share/man/man8/insmod.8.gz
+/usr/share/man/man8/kmod.8.gz
+/usr/share/man/man8/lsmod.8.gz
+/usr/share/man/man8/modinfo.8.gz
+/usr/share/man/man8/modprobe.8.gz
+/usr/share/man/man8/rmmod.8.gz
+/usr/bin/lsmod
+/usr/sbin/depmod
+/usr/sbin/insmod
+/usr/sbin/lsmod
+/usr/sbin/modinfo
+/usr/sbin/modprobe
+/usr/sbin/rmmod
+/usr/share/doc/kmod
+/usr/share/man/man5/modules.dep.bin.5.gz
+
+## internals
+
+* https://www.linux.org.ru/forum/general/4221448
+
+0 - switch KMS off if it is not supported by xf86-video-ati/radeon
+
+drivers/gpu/radeon/radeon_drv.c
+* https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/radeon/radeon_drv.c
+
+## misc 1
+
+https://www.linuxquestions.org/questions/linux-hardware-18/how-to-permanently-load-radeon-driver-4175695012/
+
+
+```
+$ cat /usr/share/X11/xorg.conf.d/00-amdgpu.conf
+Section "OutputClass"
+        Identifier "AMDgpu"
+        MatchDriver "amdgpu"
+        Driver "amdgpu"
+EndSection
+
+Section "Files"
+        ModulePath "/opt/amdgpu-pro/lib/xorg/modules"
+        ModulePath "/opt/amdgpu/lib/xorg/modules"
+        ModulePath "/usr/lib/xorg/modules"
+EndSection
+
+xserver-xorg-amdgpu-video-amdgpu: /usr/share/X11/xorg.conf.d/00-amdgpu.conf
+
+$ dpkg -L xserver-xorg-amdgpu-video-amdgpu
+/opt/amdgpu/lib/xorg/modules/drivers/amdgpu_drv.so
+/opt/amdgpu/share/man/man4/amdgpu.4
+/usr/share/X11/xorg.conf.d/00-amdgpu.conf
+
+$ man amdgpu
+$ cat /opt/amdgpu/share/man/man4/amdgpu.4
+```
+
+```
+$ ls -la /lib/firmware/amdgpu
+```
+
+## misc 2
+
+* https://ubuntuforums.org/showthread.php?t=2489555
+* https://forum.garudalinux.org/t/cant-boot-on-integrated-radeon-gpu/14890/
+* https://forums.opensuse.org/t/12-3-radeon-modeset-boot-problem/87954/
+!!!
+
+```
+$ sudo update-grub
+
+```
+
+## recovery console
+
+* [recovery-console](https://wiki.astralinux.ru/pages/viewpage.action?pageId=27361474)
+
 ## misc
 
 * https://www.youtube.com/watch?v=ebbA4jcFO5Q