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I have Centos inside Virtualbox. I need custom resolution for my screen. I run xrandr as proposed on the net. New resolution appears in the dropdown. But it doesn't work. Virtualbox addons are installed. Virtualbox gives 60Mbs of memory. Here is what I do and what I get:

Popup error message in Russian says: Unable to apply selected configuration, didn't manage to apply CRT 241 controller configuration.

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    Have you installed Guest Additions? Also, what is amount of Video RAM is configured in VM settings? Commented Mar 31, 2015 at 15:13
  • @myaut, i've updated the question to give more details. Commented Mar 31, 2015 at 15:18
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    maybe the auto resize feature is enabled, check under the View menu, or press Host + G on the keyboard, and try setting the desired resolution again. Commented Mar 31, 2015 at 19:37
  • no, autoresize is disabled Commented Apr 1, 2015 at 7:26
  • As Dalvenjia sugested, enable autoresize. You can enable all the virtualbox services with the command: $ VBoxClient --clipboard --draganddrop --seamless --display --checkhostversion or use $ VBoxClient-all. Alternatively, you can just tick what you require from the View menu of the running virtual machine. Commented Apr 13, 2015 at 23:39

1 Answer 1

Reset to default
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After adding the mode to the display, you can use xrandr to enable the mode on the display. This can be done with the following command:

xrandr --output default --mode "1600x900_60.00"

Consult the output of xrandr without any options to verify the name of the display output you are targeting is indeed default. If setting the mode fails, you may try creating & setting a mode with different parameters (resolution, refresh rate, etc).

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  • Tried, this doesn't help. Commented Apr 14, 2015 at 6:44
  • This unfortunately does not work for me, either. Output: xrandr: cannot find mode 1600x900_60.00 Commented Apr 4, 2018 at 1:30

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