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My computer booted to a black screen with this error message.

Welcome to emergency mode! After logging in,type "journalctl -xb" to view
system logs, "systemctl reboot" to reboot, "systemctl default" or ^D to
try again to boot into default mode.

journalctl -xb snippet (what I think is wrong):

ápr 19 19:25:17 agylaptop kernel: ata1.00: exception Emask 0x0 SAct 0x1c0800 SErr 0x0 action 0x6 frozen
ápr 19 19:25:17 agylaptop kernel: ata1.00: failed command: READ FPDMA QUEUED
ápr 19 19:25:17 agylaptop kernel: ata1.00: cmd 60/08:58:80:a8:29/00:00:05:00:00/40 tag 11 ncq dma 4096 in

lines 1197-1219

ápr 19 19:25:17 agylaptop kernel: ata1.00: failed command: READ FPDMA QUEUED
ápr 19 19:25:17 agylaptop kernel: ata1.00: cmd 60/00:90:80:6c:93/01:00:09:00:00/40 tag 18 ncq dma 131072 in
                                            res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ápr 19 19:25:17 agylaptop kernel: ata1.00: status: { DRDY }

Following that the next boot is slow but successful. However, the WiFi is not able to connect to the router.
In this situation I can make some improvement by using a UBUNTU Live from a USB store. I run:

$ sudo -i
$ fsck  -Cccfv /dev/sda8  

         sda8  is the home partition on my  disk.

The same error occurs after a 3 - 4 days long period. What should I do?

3
  • Please start a separate new question for the wifi problem.
    – heynnema
    Apr 28, 2020 at 1:57
  • Status please...
    – heynnema
    Apr 29, 2020 at 0:01
  • Status please...
    – heynnema
    May 1, 2020 at 14:02

1 Answer 1

6

NCQ errors

Your disk subsystem is getting ncq errors...

ápr 19 19:25:17 agylaptop kernel: ata1.00: failed command: READ FPDMA QUEUED
ápr 19 19:25:17 agylaptop kernel: ata1.00: cmd 60/00:90:80:6c:93/01:00:09:00:00/40 tag 18 ncq dma 131072 in
                                            res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
ápr 19 19:25:17 agylaptop kernel: ata1.00: status: { DRDY }

Native Command Queuing (NCQ) is an extension of the Serial ATA protocol allowing hard disk drives to internally optimize the order in which received read and write commands are executed.

Edit sudo -H gedit /etc/default/grub and change the following line to include this extra parameter. Then do sudo update-grub to write the changes to disk. Reboot. Monitor hangs, and watch /var/log/syslog or dmesg for continued error messages.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash libata.force=noncq"
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  • I edited sudo -H gedit /etc/default/grub and changed the line witch defines the value of GRUB_CMDLINE_LINUX_DEFAULT. Then I did sudo update-grub to write the changes to disk. I rebooted 4 times. I work on the system and monitor hangs however, no hang occured. Thank you for the solution. May 2, 2020 at 22:42
  • @GyorgyAntos You're very welcome!
    – heynnema
    May 2, 2020 at 22:43

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