Keyboard Backlight

[scubarth]

What release of Kubuntu you are using. DISTRIB_RELEASE=21.10
If Kubuntu is installed, is it installed 'inside' of Windows (Wubi installation). NO

• What version of KDE you are using. N/A
• What version of Grub you are using. N: Can't select versions from package 'grub' as it is purely virtual N: No packages found
• What other Operating Systems are installed. None

• Type (Desktop or laptop) Laptop
• CPU (Central Processor Unit) make (Intel, AMD, ?) and whether 32-bit, 64-bit, or ? GenuineIntel – Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz - 32-bit, 64-bit
• GPU (Graphics Processor Unit) manufacturer and model
  VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
• RAM (how much installed) 16 G
• HDs (number of and type internal - number of and type external) 1 SSD 1Gig
• Optical Drives (number of and type internal - number of and type external) N/AWhat release of Kubuntu you are using. DISTRIB_RELEASE=21.10
  If Kubuntu is installed, is it installed 'inside' of Windows (Wubi installation). NO
• What version of KDE you are using. N/A
• What version of Grub you are using. N: Can't select versions from package 'grub' as it is purely virtual N: No packages found
• What other Operating Systems are installed. None
• Type (Desktop or laptop) Laptop
• CPU (Central Processor Unit) make (Intel, AMD, ?) and whether 32-bit, 64-bit, or ? GenuineIntel – Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz - 32-bit, 64-bit
• GPU (Graphics Processor Unit) manufacturer and model
  VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
• RAM (how much installed) 16 G
• HDs (number of and type internal - number of and type external) 1 SSD 1Gig
• Optical Drives (number of and type internal - number of and type external) N/A

Brand new to Linux. I have searched many hours and cannot find how to get the backlight to my keyboard to work. It flashes at startup, but I cannot get it to come on during use.

I tried to sign up with my .live email, and it said I was blocked. Not too sure what that is about? Tried sending message to admin and I was allowed to do that either.

Thanks for any help.

[claydoh]

What specific laptop model?

[GreyGeek]

The following will tell you what backlight drivers have been precompiled for your kernel.
vdir /usr/lib/modules/$(uname -r)/kernel/drivers/video/backlight

They are "kernel objects", hence the extension somemod.ko. One of these objects may drive your backlight. It can be loaded using
sudo modprobe somemod"

To determin which module to use issue
sudo lshw
and find the line which lists your backlight. It will also include some identifying information. (I don't have a backlight so I can't supply an example) Use that info to see if it matches any *.ko in your kernel list of backlight ko's. If you find one that you think is it, or is close, you can use modinfo. Here is an example using lbm3533.ko.

:~$ [B]modinfo lm3533[/B]
filename:       /lib/modules/5.11.0-38-generic/kernel/drivers/video/backlight/lm3533_bl.ko
alias:          platform:lm3533-backlight
license:        GPL
description:    LM3533 Backlight driver
author:         Johan Hovold <jhovold@gmail.com>
srcversion:     B131391E75AD1F436AA6C7C
depends:        lm3533-ctrlbank,lm3533-core
retpoline:      Y
intree:         Y
name:           lm3533_bl
vermagic:       5.11.0-38-generic SMP mod_unload modversions
sig_id:         PKCS#7
signer:         Build time autogenerated kernel key
sig_key:        33:8D:2E:DE:DB:00:74:44:90:95:75:A1:88:D2:80:6C:96:7C:25:59
sig_hashalgo:   sha512
signature:      A4:B3:F9:08:8F:6F:27:BC:85:59:E9:35:81:44:E9:86:99:11:87:18:
                73:50:0E:41:C1:07:76:A3:EC:28:74:30:FE:89:43:66:71:63:32:11:
                B4:D0:7D:2C:98:2B:7C:F6:C7:1C:AD:F8:3B:EB:1F:6B:88:09:89:3C:
                B5:0D:BF:49:8E:CA:1E:AF:0D:21:B3:13:58:72:F7:35:0C:47:FD:9D:
                35:37:56:81:A4:98:CD:CB:C4:50:6B:17:70:08:87:F3:5D:BA:DF:70:
                7C:E8:64:F7:AA:A6:B6:C1:15:64:E0:D3:D6:DF:63:97:1D:69:58:28:
                CC:A8:57:70:DF:F1:93:48:34:19:B6:B1:C3:E8:98:92:76:16:F0:DD:
                8C:17:1D:DB:E6:60:1E:C6:38:D2:83:CD:30:00:47:46:6F:13:70:C2:
                E3:32:DA:93:91:A3:AE:FA:CB:FC:0C:0B:D7:BA:4A:39:AA:EA:B9:0B:
                2E:0C:1A:4A:8C:4D:07:9C:21:3B:0F:D5:E4:42:F2:49:92:FD:3D:FE:
                E0:14:F6:7F:54:13:44:16:8F:82:D0:FA:58:94:C0:44:81:C2:C8:66:
                DA:EA:89:06:05:80:3D:C5:A3:75:58:7B:DC:EA:9F:05:74:73:52:2D:
                DC:AC:01:56:CE:70:BD:F8:2D:54:5D:0D:C3:38:82:E7:A1:2E:93:22:
                74:7B:6B:B6:BD:34:5C:50:EA:4B:82:22:28:22:E6:FF:A5:79:DB:D6:
                BD:48:04:80:65:A2:E2:2E:E9:40:88:8A:53:89:DA:D1:46:4A:CD:3F:
                0F:26:65:91:5D:37:9A:00:D8:2A:25:12:93:AE:58:B2:D9:7E:5C:7F:
                8F:77:13:6C:F1:3F:63:B0:FA:E3:1E:E1:36:1F:0E:43:96:9E:73:DB:
                14:D2:14:E0:90:67:03:2D:68:60:F8:E4:76:92:8C:FA:17:B7:3F:CD:
                F0:96:F5:C4:FD:90:5A:51:D4:6E:40:6B:A1:8C:D2:EF:58:C7:37:A2:
                58:27:B6:CE:75:E5:31:59:0F:57:11:D1:F3:04:FB:CE:54:65:AB:EC:
                6D:03:40:C2:B9:C9:19:C7:F8:E5:E3:1C:8A:CE:06:BB:7F:FB:FC:6D:
                72:FD:85:8A:C4:2F:A9:22:28:3D:F1:FB:AB:70:3F:C7:56:45:33:7F:
                2C:A5:C0:2D:C0:BF:B4:05:30:40:65:9E:C7:1E:4B:03:F7:0E:65:BD:
                12:EE:FA:42:4C:82:7A:58:BB:D8:A6:16:DD:99:41:A0:BE:FD:F2:BE:
                00:4F:0D:CB:BD:A2:84:53:EB:AC:A3:64:37:83:0C:BC:A7:0D:AA:13:
                52:A8:49:52:8E:C2:10:16:5F:D2:32:0E
:~$

There are no params in the backlight *.ko's that I've looked at so there would be nothing to adjust. The *.ko will either work or it wont.
If the backlight is recognized its folder will be in /sys/class/leds and you can probably locate a systemd unit.file to enable and start it.