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I was just doing coding and needed to see the source code of my web-page, as I pressed F12 key, It didn't work and shown me the now allowed sign as given in below image. Then I tried other keys, I found that F10 and F11 is also not working. The keys are not working anywhere in the system.

enter image description here

Noah Domingues
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chigs
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  • Are you using a laptop that has additional functions on the F keys (e.g. change volume/brightness, mute, etc.)? – danzel Jan 30 '19 at 12:09
  • I'm using a desktop, But yes It has a Function key and all the keys are working as it should. Only these Three keys are not working. I tried it with Function key too but did not work. – chigs Jan 30 '19 at 12:37
  • please run sudo evtest, select your keyboard and press F12. Does an EV_KEY event show up? If yes, which key (the KEY_... value in parentheses)? – danzel Jan 30 '19 at 14:18

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The F keys have two functions each, one is the shortcuts we know and use, and one is the built in with the manufacturer, in the BIOS there is a setting to which of the 2 is the default, i.e. which one will execute when you press one of the F keys, and the other use is accessed via pressing fn+F?.

Zubda
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  • Welcome to AskUbuntu. While your answer is basically correct when talking about laptops, it doesn't answer the question because: the OP said they have a desktop PC and I highly doubt that it has such configuration in its firmware (since there is no built-in keyboard). The OP also stated that they tried pressing the keys in conjunction with the Fn key, but it didn't make a difference. – danzel Jan 31 '19 at 10:08
  • On Desktops the keys are wired as well with or without the fn keys. I didn't see the OPs comment regarding using the fn key as well... – Zubda Jan 31 '19 at 17:05
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If it connects via a USB cable or similar, unplug the device and then plug it in again and see if it works.

Ref: https://help.ubuntu.com/stable/ubuntu-help/power-suspendfail.html.en

This works for me in Ubuntu 18.04.6 LTS. Usually, after the system suspends, I see this issue along with a few other issues with Wifi, sound etc. Once the system is restarted all works fine.

abdulwadood
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I'm using Ubuntu 20.04 with a wired keyboard, and encountered the same question.

In my keyboard, hotkeys Fn+F10~F12 control video playing. But if there is no video captured, when I press Fn+F10 (any of F10~F12), the NO window pops up as the attached image in the OP.

There is also a hotkey Fn+Esc to enable / disable Hotkey mode. If we enable Hotkey mode, F10 acts like Fn+F10. Therefore, we may get NO window in this mode by pressing the single key F10, F11 or F12.

I guess you are in Hotkey mode. Press Fn+Esc to exit the mode.

ILS
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