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Latitude 5480: issues with touchpad, display brightness keys, audio and Ethernet in Big Sur


Santiago93
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It's Fn-F11 and Fn-F12. If you're using the ACPI-based method to enable the brightness control keys (rather than the brightness keys kext which I believe unsuitable for our Dell Latitude), you may want to add values 0x366 and 0x365 which were not present in the SSDT-BRT6 table offered by Jake:

        Method (BRT6, 2, NotSerialized)
        {
            If (LEqual (Arg0, One))
            {
                Notify (LCD, 0x86)
                [...]
                Notify (^^LPCB.PS2K, 0x0366)     // additional value
            }
            If (And (Arg0, 0x02))
            {
                Notify (LCD, 0x87)
                [...]
                Notify (^^LPCB.PS2K, 0x0365)     // additional value
            }
        }

These are the values that work on my Latitude E6230 and E7270 and also worked on my E6220, E6440, E7250 and 7490 when I had them.

 

You may also want/need to add the ACPI patch that renames GFX0 to IGPU.

 

I tried to explain the process of enabling brightness control keys here. Look it up, it contains important infomation about requirements/pre-requisites, especially on the PS2 controller kext.

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No, not with Intel wifi 

See here

 

I see you have layout-id 21 now, try switching to the following and see if it makes a different. Apart from that, you could try adding codeccommander.kext. Lastly, learn how to patch audio or ask someone who does.

11, 13, 14, 16, 56

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