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+### Debian 12 in Imac 2017
+
+### Installare installer su pen drive
+
+caricare la versione iso di debian 12 e installarlo in una chiavetta utilizzando Balena-Etcher
+
+### Autorizzare lo user per lavorare come su (sudoers)
+
+	su
+	nano /etc/sudoers
+
+inserire questa riga con user lo user che vuoi che abbia i privilegi di root 
+
+	user    ALL=(ALL:ALL) ALL
+
+uscita da su
+
+	exit
+
+### Installare sound su linux Debian 12 in un iMac 18.2 (late 2017)
+
+	sudo apt-get install linux-headers-$(uname -r)
+	sudo apt install build-essential
+	sudo apt install git
+	git clone http://forgit.patachina.it/Fabio/snd-hda-codec-cs8409.git
+	cd snd-hda-codec-cs8409
+	make
+	sudo make install
+
+fare il reboot
+
+deriva da [git link](https://github.com/egorenar/snd-hda-codec-cs8409)  
+
+### Installare tutti i pacchetti per Debian 12
+
+copiare il file per un backup
+
+	sudo cp /etc/apt/sources.list .
+
+editare sources.list
+
+	sudo nano /etc/apt/sources.list
+
+cancellare tutto e inserire 	
+
+	deb https://ftp.debian.org/debian/ bookworm contrib main non-free non-free-firmware
+	# deb-src https://ftp.debian.org/debian/ bookworm contrib main non-free non-free-firmware
+	
+	deb https://ftp.debian.org/debian/ bookworm-updates contrib main non-free non-free-firmware
+	# deb-src https://ftp.debian.org/debian/ bookworm-updates contrib main non-free non-free-firmware
+	
+	deb https://ftp.debian.org/debian/ bookworm-proposed-updates contrib main non-free non-free-firmware
+	# deb-src https://ftp.debian.org/debian/ bookworm-proposed-updates contrib main non-free non-free-firmware
+	
+	deb https://ftp.debian.org/debian/ bookworm-backports contrib main non-free non-free-firmware
+	# deb-src https://ftp.debian.org/debian/ bookworm-backports contrib main non-free non-free-firmware
+	
+	deb https://security.debian.org/debian-security/ bookworm-security contrib main non-free non-free-firmware
+	# deb-src https://security.debian.org/debian-security/ bookworm-security contrib main non-free non-free-firmware
+
+fare update e upgrade
+
+	sudo apt update
+	sudo apt upgrade
+
+installare mesa
+
+	sudo apt-get install mesa-utils
+
+verificare con 
+
+	glxinfo
+
+con
+
+	glxinfo | grep OpenGL
+	
+dovrebbe risultare qualcosa del tipo
+
+	OpenGL vendor string: Intel Open Source Technology Center # The manufacturer
+	OpenGL renderer string: Mesa DRI Intel(R) Haswell Desktop # The type of the chip
+	OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.3.2 # The OpenGL version fully supported, here 3.3 thanks to Mesa 10.3.2 .
+	OpenGL core profile shading language version string: 3.30 # The GLSL version fully supported
+
+con il comando si verifica accellerazione 3D
+
+	glxinfo | grep rendering
+
+dovrebbe dare
+
+	direct rendering: Yes
+
+per vedere i frame per secondo
+
+	glxgears -info
+
+