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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.

Kulfy
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Purushothaman
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  • 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 04:49
  • You need to get keyboard repaired. You can wait until Ubuntu boots up. Flickering might stop – Kulfy Dec 12 '18 at 08:12
  • Thank you @Kulfy, we have resolved the problem by disabling the laptop keyboard. Thanks again. Soon I will replace the defective keyboard. – Purushothaman Dec 12 '18 at 11:00

1 Answers1

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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

Replaced

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

with

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.

Kulfy
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Purushothaman
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  • Opening GUI apps with sudo is not recommended. You might like to read [Why should users never use normal sudo to start graphical applications?](https://askubuntu.com/questions/270006). I replaced gedit with nano. The results will be same. – Kulfy Dec 12 '18 at 11:52