We have installed Xubuntu 16.04 in the Dell Inspiron N5050 laptop which is showing display problem.

Ubuntu screen is showing the following message and started blinking continuously.

modem-manager[810]: Loaded plugin Gobi
modem-manager[810]: Loaded plugin Longcheer
modem-manager[810]: Loaded plugin ZTE
modem-manager[810]: Loaded plugin X22X
modem-manager[810]: Loaded plugin Option High-Speed

If any other information is needed, kindly inform.

  • We have windows operating system in the same laptop, which does not have this problem. – Purushothaman Dec 11 '18 at 11:25
  • Do you use any key while this message appears? If yes this may be a cause of blinking. These messages are related to modemmanager package. Do you have some modems to be managed? If no, you can remove this package using sudo apt autoremove modemmanager. It doesn't have to do something with other OS. – Kulfy Dec 11 '18 at 11:58
  • @Kulfy. You are correct sir. There is a defective key present in the laptop. Hence it is pressing by itself during reboot. We believe this might be the problem. – Purushothaman Dec 11 '18 at 13:22
  • @Kulfy We have removed modemmanager. Still display is not set. – Purushothaman Dec 12 '18 at 4:49
  • You need to get keyboard repaired. You can wait until Ubuntu boots up. Flickering might stop – Kulfy Dec 12 '18 at 8:12

The screen flickering was due to input by keyboard. We have disabled the laptop keyboard during splash using the following method:

sudo nano /etc/default/grub




GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i8042.nokbd"

and updated the grub using the following command

sudo update-grub     

After reboot the display problem solved.

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