Comment # 21 on bug 944659 from milan zimmermann

1. ----------

FWIW I agree this is likely nothing to do with the video driver, or any driver,
likely more some kernel module.

2. ----------

I added the blacklist acpi-cpufreq into /etc/modprobe.d/99-local.conf

then rebooted several times. 

The boot still hangs most of the time. When is starts:

home-server:~ # dmesg | grep cpufreq                                            
home-server:~ #

Does that mean the blacklist worked and I do not have to remove the ko file?

I my system, I have:                                                            

home-server:~ # ls /lib/modules/4.1.6-9-desktop/kernel/drivers/cpufreq/         
acpi-cpufreq.ko          cpufreq_conservative.ko  cpufreq_stats.ko     
powernow-k8.ko                              
amd_freq_sensitivity.ko  cpufreq_powersave.ko     cpufreq_userspace.ko     

Do you think it would make sense to start deleting those one by one and see if
any of them helps? This is an AMD system.

3. --------

Also , having booted to "rescue system" with acpi=off (which works 100%), I
see:

cat /proc/cmdline
  acpi=off initrd=initrd splash=silent rescue=1 install=hd:///

But if I set acpi=off in my hard disk boot, there is no difference and it
mostly hangs.

Is it possible the boot/hang boot behavior depends on the initrd which is
likely different on the USB vs my system?