The previous two questions regarding the ACPI error message do not have answers that fix my problem with the same error. I have just upgraded to 15.04 and cannot log in after a normal boot. The login screen shows briefly then reverts to a text only screen and alternates between the two screens on about a 1/2 second cadence. The laptop includes a nvidia graphics card. I am guessing that 219 is referring to an older version of the graphics controller but I could be mistaken.
I can only boot to recovery mode and use the system prompt from that mode. The syslog file did not reveal anything that I could recognize as useful.
What other log files might be informative?
How can I disable the nvidia driver so I can troubleshoot in normal operation?
Thanks.
Since my original post I have started ubuntu with the default video driver and purged nvidia drivers and installed nvidia-current-updates. Now when booting I still see the "ACPI PCC probe failed; starting version 219" message but I can log into the machine. Ubuntu reports an error in the Xorg area that I have yet to chase the details of. I am happy the machine is again usable but would like to pursue the source of the ACPI error. Any assistance would be appreciated.
Best Answer
I did receive this "ACPI PCC probe failed; starting version 219" error as soon as I received the latest version of Ubuntu (15.04) with the generic kernel 3.19. ???. As soon as I rebooted my laptop the screen went blank (or a black screen) and the laptop just "hung" and would not proceed further. The only option for me was to power off and then power on. Upon booting, Ubuntu went to the " "advanced ubuntu options" in GRUB " and by selecting the prior available kernel 3.18. ??, my laptop booted successfully and was quite usable as before.
As from April 23, 2015 until this morning, May 20, 2015, I had to use the ... power on, power off, power on, select the kernel 3.18. ?? to use my laptop ... . On the morning of May 20, 2015, Ubuntu made availble the latest Kernel 3.19.0.18 to download and now my laptop boots up properly as before with no errors.
As is the same with Microsoft Windows, the developers at Ubuntu must always update their operating systems and sometimes minor things do get missed.
My laptop is a Dell Inspiron B120 with a "Intel® Celeron(R) M processor 1.40GHz", "Intel® 915GM x86/MMX/SSE2" graphics card, 32 bit processor, and 2 Gigabyte RAM. It is a solid laptop but struggles with Windows as Windows can be quite hefty on older laptops which is why I chose Ubuntu as it is really quite a light operating system that offers similar functionality as Windows.
I appreciate Ubuntu very much and hopefully, future upgrades will explain a little more clearly some missed errors whether critical or not.
Anyway, I understand the tribulations for the operating systems programmers and the effort required to update operating systems to keep them secure.
I wish them well.