Hi! i did add acpi_backlight=lenovo without success 
Dear yusssufff,
A new Snap recipe was released by OpenMandriva. I tried the live media, and the brightness worked as expected. I compared the /etc/default/grub file (as highlighted above) with the live media’s grub file. It seems these two lines were modified, so I added them to Rome 23’s /etc/default/grub file.
Then I ran
update-grub2
and rebooted.
Now, everything is good, and the brightness works as expected 100%. I have tested it in both the X11 and Wayland editions of KDE Plasma 6 and 5. This might be helpful to you!
GRUB_CMDLINE_LINUX_DEFAULT & GRUB_CMDLINE_LINUX_RECOVERY.
See the exact contents of the ACTIVE grub file of mine
[radium88@mariaSalomeaCurie ~]$ cat /etc/default/grub
GRUB_GFXPAYLOAD_LINUX=keep
GRUB_DISABLE_RECOVERY=false
GRUB_DISTRIBUTOR="OpenMandriva Lx"
GRUB_GFXMODE=auto,1680x1050,1360x768,1280x800,1024x768,1024x600,800x600,640x480
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
GRUB_TIMEOUT="10"
GRUB_CMDLINE_LINUX_DEFAULT=" quiet splash=silent logo.nologo audit=0 rd.timeout=120 dm_mod.use_blk_mq=1 rd.systemd.show_status=0 systemd.show_status=0 "
GRUB_CMDLINE_LINUX_RECOVERY=" failsafe drm.edid_firmware=edid/1024x768.bin vga=788 systemd.log_level=debug systemd.log_target=kmsg log_buf_len=1M audit=0 rd.timeout=120 "
GRUB_NOECHO="true"
[radium88@mariaSalomeaCurie ~]$ date
Sunday 21 July 2024 11:25:31 AM IST
[radium88@mariaSalomeaCurie ~]$
Please find the grub backup file (previous one) entry
[radium88@mariaSalomeaCurie ~]$ cat /etc/default/grub_20240721_bkpsz
GRUB_GFXPAYLOAD_LINUX=keep
GRUB_DISABLE_RECOVERY=false
GRUB_DISTRIBUTOR="OpenMandriva Lx"
GRUB_GFXMODE=auto,1680x1050,1360x768,1280x800,1024x768,1024x600,800x600,640x480
GRUB_DEFAULT=saved
GRUB_SAVEDEFAULT=true
GRUB_TIMEOUT="10"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash logo.nologo acpi_osi=Linux acpi_osi='!Windows 2012' acpi_backlight=vendor audit=0 rd.timeout=120 dm_mod.use_blk_mq=1 rd.systemd.show_status=0 systemd.show_status=0"
GRUB_CMDLINE_LINUX_RECOVERY=" failsafe nomodeset xdriver=vesa vga=788 acpi_osi=Linux acpi_osi='!Windows 2012' acpi_backlight=vendor systemd.log_level=debug systemd.log_target=kmsg log_buf_len=1M audit=0 rd.timeout=120 "
GRUB_NOECHO="true"
[radium88@mariaSalomeaCurie ~]$ date
Sunday 21 July 2024 11:28:53 AM IST
[radium88@mariaSalomeaCurie ~]$
Thanks a lot !!!
@linuxium88 Welcome.
Thank you for sharing 
I edited your message applying the code tag where appropriate.
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by linuxlizard
Thanks