Stability Problem and boot fail with linux on amd1090t

Once installed Debian Wheezy 7.3 on my pc , an Amd phenom 2 x6 1090t mounted on a asrock 890gx extreme 3  i discovered
that at the boot time 1 time every 10 my pc gave me a error .
It writes : rcu_sched detected stalls on CPUs/tasks:
All i can do then is to reboot it with the physical button.
Sometimes after the boot my pc freezed and i have to reboot again with the physical button .
Finnaly i discover how to solve my problems.
I installed the driver  amd64-microcode from the repositories and now my system is stable and never fail a boot.
amd64-microcode is a linux driver for amd processor.
So in order to install the it open a terminal and execute those commands:

sudo apt-get update

sudo apt-get install amd64-microcode 

You have also to make this if you don'tuse hdmi audio and have an ati vga
sudo nano /etc/modprobe.d/user-blacklist.conf

Insert this in the file 
 blacklist snd_hda_codec_hdmi

That'is it  if i help you please let me a comment.




Thank you , you solved my boot problems!

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