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16 Posts

10-07-2019

HK

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  • Posts: 16
  • Registered: ‎10-07-2019
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[Legion Y740] Brightness Adjustment Failed with "Switchable Graphics" in BIOS

2019-10-07, 9:15 AM

I recently changed my BIOS setting on Graphics mode (from "discrete graphics" to "switchable graphics"), then I found that my screen brightness adjustment failed to work after the setting. I tried to adjustment screen brightness by keystroke and system settings. Both attempt failed to change to screen brightness as shown in capscreens below:

 

Is there any fix for that??

 

 

Hardware and OS Spec
- Lenovo Legion Y740
- Integrated Graphics Card + GeForce RTX 2070 Max-Q
- Dual Boot with Ubuntu 16.04 and Windows installed in C:\

 

BIOS Spec
- Secure Boot: Disabled
- Storage mode: AHCI
- Graphics: from "Discrete Graphics" to "Switchable Graphics"

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16 Posts

10-07-2019

HK

38 Signins

283 Page Views

  • Posts: 16
  • Registered: ‎10-07-2019
  • Location: HK
  • Views: 283
  • Message 2 of 3

Re: [Legion Y740] Brightness Adjustment Failed with "Switchable Graphics" in BIOS

2019-10-07, 15:59 PM
[Update] Still no clue on the cause. I set "nomodeset" in grub configuration in near time, but not sure if they are related
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16 Posts

10-07-2019

HK

38 Signins

283 Page Views

  • Posts: 16
  • Registered: ‎10-07-2019
  • Location: HK
  • Views: 283
  • Message 3 of 3

Re: [Legion Y740] Brightness Adjustment Failed with "Switchable Graphics" in BIOS

2019-10-09, 8:11 AM

For those users looking in this post, you can refer to another post for the answer:

https://forums.lenovo.com/t5/Other-Linux-Discussions/Linux-on-Legion-Y740-no-brightness-backlight-co...

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