Hello, I bought a new laptop. Shred windows, install opensuse 42.2 Leap with KDE. Everything works well except one important thing. I can not change the brightness of my display! When I click on the icon for power management, there is no bar to change this value. Simply it doesn’t exist. All other settings are possible. The keyboard buttons doesn’t work too (for sound work). When I create keyboard shortcut, it doesn’t work. Please, can anybody help me to solve this problem? The laptop is Fujitsu Lifebook A557, Intel Core i5 7200U Kaby Lake with Intel HD Graphics 620. Thanks very much. Andrew
Hi vaon,
you could try to add some additional Kernel parameters to the Grub entry.
Try it with one of the following parameters:
- acpi_osi= acpi_backlight=native
- acpi_osi= acpi_backlight=vendor
- acpi_os_name=Linux acpi_osi= acpi_backlight=vendor
- acpi_os_name=Linux acpi_osi= acpi_backlight=native
Only if I googled well … (before I’ll destroy my system 
)
sudo kwrite /etc/default/grub
then edit the line to
GRUB_CMDLINE_LINUX_DEFAULT=“resume=/dev/sda2 splash=silent quiet showopts” “acpi_osi= acpi_backlight=native”
save
sudo update-grub
restart
It is right way? 
Better first try them on the boot screen. Then they are only for that single boot.
And when you found out what you want to edit for fixed, use YaST > System > Bootloader.
As hcvv already mentioned try to on boot.
Restart your laptop and when the Grub menu appears hit “e”. Then change the GRUB_CMDLINE_LINUX_DEFAULT= to
GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/sda2 splash=silent quiet showopts" "acpi_osi= acpi_backlight=native"
Then press F10 to start Linux with the additional parameters. This way the parameters are only valid for this session and you can try the other one the same way to check if one them is working. Without breaking things.
cat /proc/cmdline
session 1: BOOT_IMAGE=/boot/vmlinuz-4.4.36-8-default root=UUID=817de80e-1766-4747-8cd3-7318a7161072 ro resume=/dev/sda2 splash=silent quiet showopts acpi_osi= acpi_backlight=native
session 2: BOOT_IMAGE=/boot/vmlinuz-4.4.36-8-default root=UUID=817de80e-1766-4747-8cd3-7318a7161072 ro resume=/dev/sda2 splash=silent quiet showopts acpi_osi= acpi_backlight=vendor
session 3: BOOT_IMAGE=/boot/vmlinuz-4.4.36-8-default root=UUID=817de80e-1766-4747-8cd3-7318a7161072 ro resume=/dev/sda2 splash=silent quiet showopts acpi_os_name=Linux acpi_osi= acpi_backlight=vendor
session 4: BOOT_IMAGE=/boot/vmlinuz-4.4.36-8-default root=UUID=817de80e-1766-4747-8cd3-7318a7161072 ro resume=/dev/sda2 splash=silent quiet showopts acpi_os_name=Linux acpi_osi= acpi_backlight=native
:’( unfortunately the problem persists in all sessions - after click on battery icon > settings … there is no slide bar
Those setting may or may not allow the hardware buttons to work it won’t change the code to display a slider
…may or may not allow the hardware buttons to work…
Not allow hw buttons, any of these settings.
What Windows version was installed?
Sometimes adding these parameters could also help.
-
acpi_osi=! acpi_osi=“Windows 2009”
-
acpi_osi=! acpi_osi=“Windows 2012”
-
acpi_osi=! acpi_osi=“Windows 2015”
-
acpi_osi="!Windows 2009"
-
acpi_osi="!Windows 2012"
-
acpi_osi="!Windows 2015"
Source: Arch Wiki
And the HW buttons don’t work either?
It was installed Windows 10, from manufacturer.
HW buttons sun down (F6), sun up (F7)
F3 mute, F8, F9 for sounds works with Fn
no efect …
I have the same problem on my son’s laptop, an asus N552V.
no slide in systemsettings>power management and no fn>function buttons works (other fn>fx for audio for example works) to increase o decrease screen luminosity.
for clarification and for make the correct test, when I insert the parameter in grub at the boot pressing “e” I have to insert:
- acpi_osi= acpi_backlight=native
or with " - “acpi_osi= acpi_backlight=native”
or without spaces
3)acpi_osi=acpi_backlight=native
and for this?
4)acpi_osi=! acpi_osi=“Windows 2015”
or with additional "
5)"acpi_osi=! acpi_osi=“Windows 2015"”
and also when I insert in yast>bootmanager??
manythanks, ciao pier
Hi pier_andreit,
You have to add it with spaces in between. Like this:
resume=/dev/sda2 splash=silent quiet showopts acpi_osi=acpi_backlight=native
resume=/dev/sda2 splash=silent quiet showopts acpi_osi=! acpi_osi="Windows 2015"
In Yast you can do it the same way.
e.g. my Kernel parameter line looks like this:
resume=/dev/sda2 splash=silent quiet showopts acpi_os_name=Linux acpi_osi= acpi_backlight=vendor
Hi pier_andreit,
You can also try to add this:
resume=/dev/sda2 splash=silent quiet showopts acpi_os_name=Windows
or:
resume=/dev/sda2 splash=silent quiet showopts acpi_osi=
**acpi_osi= **It’s followed by a blank space.
The last example seems to work on an ASUS N550JV laptop. Maybe it is working also for your model.
@vaon:
You can try the same.
I tried and no effect.
That the HW buttons not working properly is a problem on most laptops, but that the brightness slider is missing is a bit strange…
Regarding the Kernel parameters have also a look here: Kernel Command-Line Options on Arch Wiki and here Intel Graphics. If that’s not working… I am running out of ideas. Sorry.
@pier_andreit
Has your laptop a 4K/UHD screen resolution? Found a blog from a guy who installed openSUSE Leap 42.2 on his ASUS Zenbook UX305. He posted a solution which may work on your laptop as well. Link to blog.
There is a widget you can use Battery and Brightness don’t know if it works I don’t have a notebook. Don’t know why settings does not have it but then lots of little things missing in Plasma 5 that were in KDE4
I thin it doesn’t depend on the lot of things that miss in plasma5, in the other my laptop with plasma5 the slide is present…
many thanks thor, my son’s asus laptop has a fullHD 1920x1080 screen resolution, but I’ll give a sight :), as soon as I’ll have the laptop in my hands 
The problem is that both guys have the widget but there is no brightness slider shown in that widget, which is kinda strange. It would be good that either the HW buttons or the brightness slider are working, but both option are not working on their laptops.