Sunday, 29 June 2014

Debian Screen Resolution when Hyper-V Guest

So I had a need to create a virtual machine on my laptop running Debian Jessie (Testing).   After the installation the screen resolution was limited to 1152x846.   This is a limit within Hyper-V.

I don't know why it took me a number of hours to find the fix for this but I found how to set the resolution on a blog called Random.GetNewEntry().

What is interesting about the fix is that it doesn't involve configuring X Windows. It is a simple change to the GRUB launch command.

I am keeping a copy of the changes needed here for my own reference, but 100 internets go to the owner of the blog.

  1. Edit the grub configuration file, for example:
    sudo vi /etc/default/grub
     
  2. Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT, and add "video=hyperv_fb:1680x1050" (or your custom resolution) in between the quotes. For example: 
    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=hyperv_fb:1680x1050"
  3. Save and exit 
  4. Run 
    sudo update-grub
  5. Restart your computer


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10 comments:

  1. Unknown5 February 2015 at 06:42

    Thanks a lot!

    ReplyDelete
  2. Bevan15 July 2015 at 19:16

    Thanks so much for this, I've been looking everywhere :D

    ReplyDelete
  3. Nuno Pratas25 July 2016 at 23:31

    thanks a lot!

    ReplyDelete
  4. Jon Williams24 April 2017 at 21:11

    Worked like a charm. Big Thanks.

    ReplyDelete
  5. Unknown7 October 2017 at 20:49

    thanks i was hungry i needed some GRUB!

    ReplyDelete
  6. prabu26 May 2018 at 00:10

    This worked :) Thank you!

    ReplyDelete
  7. Unknown19 March 2019 at 08:14

    Thank you for sharing this. What I had to do was the following:

    gedit /etc/default/grub

    With that, I was able to edit and save.

    ReplyDelete
  8. VincentC19 December 2019 at 01:07

    Still working with Debian 10 & Hyper-V server 2019 !
    Thank you so much

    ReplyDelete
  9. MrChris15 December 2020 at 12:05

    Worked for me on debian 10 under hyper-v/win10. Thanks!

    ReplyDelete
  10. Harley24 June 2021 at 08:22

    very nice. Thank you, and the original poster.

    ReplyDelete

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