How can I increase the Hyper-V display resolution?

Here is how you can change the resolution of Ubuntu (Linux) running in Hyper-V:

• Install linux-image-extras (hyperv-drivers): sudo apt-get install linux-image-extra-virtual
• Open the Terminal and type: sudo gedit /etc/default/grub
• Find the line starting with GRUB_CMDLINE_LINUX_DEFAULT, and add video=hyperv_fb:1920x1080 (or your preferred resolution) in between the quotes (The maximum possible resolution is 1920x1080) like this: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=hyperv_fb:1920x1080"
• Save and Exit
• Run sudo update-grub
• Restart Hyper-V (restarting Ubuntu (Linux) might be enough)

Increased display size of Hyper-V to 1680x1050. My Windows 8 display resolution is 1920x1200:

In the latest release of Ubuntu, the Hyper-V Integration Services are built into the kernel and won't help. Unfortunately even with windows, hyper-v won't display a larger resolution when accessing it through the virtual machine manager.

Try accessing it through VNC, you will be able to get a better resolution that way.