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Smanthena
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Function keys for Brightness control (F11, F12) do not work as expected

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I purchased Dell Inspiron 5558 (with Windows 10) just two months ago (Nov 2015). Everything was working fine. However, recently I started to notice an annoying thing with the function keys F11 and F12 for reducing and increasing the brightness respectively. 

Without using the Fn key (next to Windows key), if I hit F11 it was reducing the brightness and F12 was increasing the brightness earlier - as expected. Now, sometimes, the laptop monitor goes to sleep mode the moment I hit F11 or F12. I have to press the power button again to wake it up. This behavior is very off and on and not consistent.

Did any settings get changed? How to fix this? Please help.

FYI - I have not changed the BIOS settings from default which could be multimedia. I can say this because other multimedia keys in the same row behave normally (even when this strange behavior is noticed in F11 and F12).

Thanks,

Shashi

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RE: Function keys for Brightness control (F11, F12) do not work as expected

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Hello Shashi,

The settings for those FN keys are handled by the Dell Quickset Utility, and later the Dell Command Configuration application, so any changes you would want to make would be done in that application.  

I would suggest going into that application and seeing if you can change the settings.   Putting a system to sleep is one of the functions available so perhaps the configuration has changed.   If you want additional help please click on my Dell Todd username and send me a private message with the Dell Service Tag of the system and I'll see if I can help.   Please keep all discussions and troubleshooting here in this thread so that others, with the same questions or problems, can see what is done to resolve.

Todd

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Av8r915
1 Copper

RE: Function keys for Brightness control (F11, F12) do not work as expected

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I'm having the exact same problem with the exact same model of laptop.  I've updated the BIOS and the problem still persists for me.

sebberry
1 Copper

RE: Function keys for Brightness control (F11, F12) do not work as expected

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I'm having the same issue - I'll go to adjust the brightness to suit the room that I'm in and the system will go to sleep, requiring me to wait several seconds before I can wake it up by pressing the power button.

It's erratic and only happens occasionally.  There's no setting anywhere that's configured to put the system to sleep with the use of either of those keys.

tdecker51301
1 Copper

RE: Function keys for Brightness control (F11, F12) do not work as expected

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I am having this same issue.  For some reason I cannot find the Dell Quickset Utility.  I'm wondering if there is a way I can reinstall the Quickset Utility.  When I restart the computer, the function keys will work normaly for a while, and then pressing any of them will put my computer in sleep mode.  Very frustrating.  Any help is greatly appreciated.

RE: Function keys for Brightness control (F11, F12) do not work as expected

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I'm having a similar problem, except with the Dell Inspiron 15 5000 AMD. My laptop doesn't go to sleep, I am just unable to change the brightness through f11 and f12 keys. Anyone know solutions?

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piyushmetkar3
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RE: Function keys for Brightness control (F11, F12) do not work as expected

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Hi Todd,

I am facing the same problem that my laptop, 5558, goes to sleep most of the times when I try to decrease the brightness of screen by pressing Fn+F11. I tried your solution, However, I could not find Dell Quickset Utility in my Windows Start Menu.

Can you please help me out ? Waiting in anticipation for your reply.

Thanks & Regards,

Piyush

BrianDu1
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RE: Function keys for Brightness control (F11, F12) do not work as expected

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Hi Todd, I'm afraid I don't think this response helps us much. Looks like almost all the replies have the same common problem - we don't see anything called Dell Quickset Utility or Command Configuration. I think the majority here have Inspiron 5558 with Windows 10 (including myself). I researched that Quickset Utility page and find no relevant information or applications for me. I tried looking for the other ones suggested but cannot find anything. I checked all the drivers available for my device and none sound similar in name or function to any of the suggested applications.

It seems clear that it is a bug for this particular model? My first Google search "pressing fn key and brightness puts my computer to sleep" came up with this thread and everyone in it has Inspiron 5558s

Can you please review again?

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BrianDu1
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RE: Function keys for Brightness control (F11, F12) do not work as expected

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Same here! We all have the exact same model and problem. I replied to Todd's post as well to try to get more action

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BrianDu1
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RE: Function keys for Brightness control (F11, F12) do not work as expected

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Are you pressing only F11 / F12 or are you also pressing the 'Fn' key?

If you aren't, then that may be what you need to do, If you ARE already pressing the Fn key also, then maybe you have the Fn (Function) key disabled. To enable it, press Fn + Esc