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<< Solved >> Backlight comes up after about 3 minutes after login

Joined
Dec 13, 2014
Messages
14
Motherboard
ASUS TUF B356M-PLUS GAMING
CPU
i5-9600kf
Graphics
Radeon VII
Mac
  1. iMac
  2. MacBook Pro
Mobile Phone
  1. iOS
Hi everyone,

I have installed the MacOS Catalina, and after post install, I faced the problem of no backlight for initial period of time.
My laptop is Lenovo s730-13iml.

CPU: i7-10510u
Mem: LPDDR3 16G
GPU: intel UHD 620
WiFi & Bluetooth: BCM94350ZAE (DW1820A)

However, after about 3 minutes backlight comes up.
I have full QE/CI with UHD 620.
I have the brightness slider, in the display setting, and can change the brightness.

I read these threads:
https://www.tonymacx86.com/threads/black-screen-3-minutes-after-booting-coffeelake-uhd-630.261131/


However, same result.

Problem reporting file is attached below.

Thanks a lot in advance :)
 

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  • debug_9395.zip
    13.5 MB · Views: 17
Last edited:
Joined
Dec 13, 2014
Messages
14
Motherboard
ASUS TUF B356M-PLUS GAMING
CPU
i5-9600kf
Graphics
Radeon VII
Mac
  1. iMac
  2. MacBook Pro
Mobile Phone
  1. iOS
Add boot argument -igfxblr (to fix backlight registers on KBL, CFL and ICL platforms).
Problem solved.
 
Last edited:
Joined
Mar 7, 2021
Messages
5
Motherboard
Msi Modern 15 A10M
CPU
Intel i5 10210U
Graphics
Uhd 620
Hello i already have the same problem too and i had to add these lines enable-backlight-register
in addition to -igfxblr argument
Code:
<key>enable-backlight-registers-fix</key>
                <data>AQAAAA==</data>

to PciRoot(0x0)/Pci(0x2,0x0) Device properties.
 
Joined
Dec 13, 2014
Messages
14
Motherboard
ASUS TUF B356M-PLUS GAMING
CPU
i5-9600kf
Graphics
Radeon VII
Mac
  1. iMac
  2. MacBook Pro
Mobile Phone
  1. iOS
Hello i already have the same problem too and i had to add these lines enable-backlight-register
in addition to -igfxblr argument
Code:
<key>enable-backlight-registers-fix</key>
                <data>AQAAAA==</data>

to PciRoot(0x0)/Pci(0x2,0x0) Device properties.
-igfxblr and enable-backlight-registers-fix is same function.
Thanks.
 
Joined
Mar 7, 2021
Messages
5
Motherboard
Msi Modern 15 A10M
CPU
Intel i5 10210U
Graphics
Uhd 620
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