View source for Kernel Fails to Load (pata acpi error)/en

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= Overview =

{{tip|'''Parallel ATA''' ('''[http://en.wikipedia.org/wiki/Parallel_ATA PATA]''') is an interface standard to connect storage devices, and the '''Advanced Configuration and Power Interface''' ('''[http://en.wikipedia.org/wiki/Acpi ACPI]''') is used for device configuration and power management.}}


This problem may affect particular computer systems using the '''[http://en.wikipedia.org/wiki/JMicron JMicron PATA Controller chipset]''', which is used to control and access storage devices, such as Solid State Drives ('''[http://en.wikipedia.org/wiki/Solid-state_drive SSD]'''). More specifically, it may be due to the '''PATA ACPI driver''' being loaded by the GRUB ('''GR'''and '''U'''nified '''B'''ootloader), which has consequently resulted in a conflict with the ''JMicron'' chipset. Should this indeed be the case, then an error message similar - or identical - to the example provided below should be displayed upon attempting to boot the affected kernel version(s):

 ERROR: device 'UUID=......' not found. Skipping FSCK'
 ERROR: Unable to find root device 'UUID=......'
 You are being dropped to the recovery shell
 Type 'exit' to try and continue booting
 sh: can't access tty: job control turned off'
 [...]
 mount: can't find UUID='.....'
 You are now being dropped into the emergency shell.


If so, then the solution is to simply stop the ''PATA ACPI'' driver from being loaded in the first place. This is a simple task, undertaken by amending a single line in the '''default grub''' file.


= Opening the Default GRUB File = 

{{warning|'''DO NOT edit the ''grub.cfg'' file'''. This is not the same as the ''grub'' file, which does not have an extension at the end of its name.}}


The syntax of the command to open the grub file is:
{{UserCmd|command=sudo [text editor] /etc/default/grub}}


For example, if you wish to edit the file within the terminal using nano (a standard terminal-based text editor) then enter:
{{UserCmd|command=sudo nano /etc/default/grub}}


If you have installed the full version of Manjaro, not the NET-Edition, you may find it easier to use the pre-installed ''gedit'' text editor instead. This will open the file up as a document, making it easier to read and edit. To use ''gedit'' instead, enter:
{{UserCmd|command=sudo gedit /etc/default/grub}}

= Editing the Default GRUB File =

Once the ''default grub'' file has been opened, it will be necessary to amend the '''GRUB_CMDLINE_LINUX=""''' command, which is itself located near the top of the file. An example has been provided below, with the appropriate line '''<font color="green">highlighted in green</font>''' below for illustrative purposes:

 GRUB_DEFAULT=saved
 GRUB_TIMEOUT=5
 GRUB_DISTRIBUTOR="Manjaro"
 GRUB_CMDLINE_LINUX_DEFAULT="GRUB_CMDLINE_LINUX_DEFAULT= resume=/dev/disk/by-uuid/<some-guid>"
 <font color="green">'''GRUB_CMDLINE_LINUX=""'''</font color>


To prevent the ''PATA ACPI'' driver from being loaded, '''modprobe.blacklist=pata_acpi''' must be added in between the otherwise empty speech marks. An example of the necessary amendment has been provided below, which has again been '''<font color="green">highlighted in green</font>''' for illustrative purposes:

 GRUB_DEFAULT=saved
 GRUB_TIMEOUT=5
 GRUB_DISTRIBUTOR="Manjaro"
 GRUB_CMDLINE_LINUX_DEFAULT="GRUB_CMDLINE_LINUX_DEFAULT= resume=/dev/disk/by-uuid/<some-guid>"
 '''GRUB_CMDLINE_LINUX="<font color="green">modprobe.blacklist=pata_acpi</font color>"'''


Once you have completed the amendments, save the change and close the file by:

* '''nano''': Press CTRL and 'x' to exit, 'y' to save, and <enter> to finish, or
* '''gedit''': Select the 'save' option and then close the window.


Now all that is necessary is to '''update the GRUB''' before rebooting.


= Updating the GRUB =

To update the GRUB, ensure that the terminal is open, and enter the folliwing command:

 {{UserCmd|command=sudo update-grub}}


Once complete, reboot your system for the change to take effect.


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