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Solved Unable to adjust laptop screen brightness


Gking19

New Member
Posts
8
#1
First, techincal specs.
I have a Windows 8.1 Toshiba Satellite L875D-S7332, with a AMD A6-4400M APU processor with integrated graphics. My display adapter, according to device manager, is a AMD Radeon HD 7520G.

Now, my problem is that I'm unable to adjust the screen brightness of my laptop. I haven't made any recent changes, and I noticed this about a week or so ago(I don't typically change my laptop brightness, so this could have been happening for longer). In the mean time, I've tried rolling back my display drivers, with no success, and also updating to the latest driver set, which has also not worked. I'm not sure where to go from now, does anyone have any ideas to fix this?
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

MilesAhead

Eclectician
VIP Member
Pro User
Posts
2,130
#2
Welcome to the Forums.


What happens when you try to adjust the brightness? Is there no setting? Setting grayed out? Or you change the setting but nothing happens?

If it changes for an instant, then reverts to what it was, adaptive brightness may be enabled.
 

My Computer

System One

  • OS
    Windows 8.0 x64
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satelite C55D-A Laptop
    CPU
    AMD EI 1200
    Memory
    4 gb DDR3
    Graphics Card(s)
    Raedon 340 MB dedicated Ram
    Monitor(s) Displays
    Built in
    Screen Resolution
    1366 x 768
    Hard Drives
    640 GB (spinner) Sata II
    Keyboard
    Built in
    Mouse
    Touch pad

Gking19

New Member
Posts
8
#3
Welcome to the Forums.


What happens when you try to adjust the brightness? Is there no setting? Setting grayed out? Or you change the setting but nothing happens?

If it changes for an instant, then reverts to what it was, adaptive brightness may be enabled.
I (attempt to) use the function keys on my keyboard, to adjust the brightness, and the slider appears in the top left corner of my screen, but pressing the "down" button along with Fn does not result in any change of the slider. If, while the slider is still visible, I manually change it with my mouse, and move the slider down halfway or so, the screen brightness does not change that way either. If I go to the taskbar, right click the battery, select power options, and change the slider on the new window that appears, that has no effect either.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

Gking19

New Member
Posts
8
#4
I have also tried changing power profiles (high performance, balanced, etc) and adjusting brightness on each of them, and that has not worked.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

alphanumeric

slightly off center
VIP Member
Guru
Gold Member
#5
Any other special Fn keys not working like volume up down?
 

My Computer

System One

  • OS
    Windows 10 Education 64 Bit
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    Asus
    CPU
    AMD Phenom II X4 980 Black Edition Deneb 3.7GHz
    Motherboard
    ASUS M4N68T-M V2 µATX Motherboard
    Memory
    8GB 4GBx2 Kingston PC10600 DDR3 1333 Memory
    Graphics Card(s)
    NVIDIA Geforce GT640 2 Gig DDR3 PCIe
    Sound Card
    VIA VT1708s High Definition Audio 8-channel Onboard
    Monitor(s) Displays
    22" LG E2242 1080p and 2 19" I-INC AG191D
    Screen Resolution
    1280x1024 - 1920x1080 - 1280x1024
    Hard Drives
    Crucial MX100 256 GB SSD and 500 GB WD Blue SATA
    PSU
    Thermaltake TR 620
    Case
    Power Up Black ATX Mid-Tower Case
    Cooling
    Stock heatsink fan
    Keyboard
    Logitech Wireless K350 Wave
    Mouse
    Logitech M570 Trackball and T650 TouchPad
    Internet Speed
    80 Mbps Down 30 Mbps Up
    Browser
    Internet Explorer 11
    Antivirus
    Windows Defender
    Other Info
    HP DVD1040e Lightscribe - External USB2

Gking19

New Member
Posts
8
#6
Nope, all those work. And as I mentioned before, it's not an issue isolated with Fn keys, no method that I've tried so far (fn keys, power options>adjust brightness, switch power profiles) has worked.

*edit*

I don't know if this has anything to do with it, but I automatically installed about 12 windows updates a week or so ago, from what I can tell none of them included driver updates, but who knows.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

alphanumeric

slightly off center
VIP Member
Guru
Gold Member
#7
OK, on some laptops a utility is needed for the special FN keys to work. If none of them worked I would have gone down that road. Is this a factory OEM install? If yes was it originally 8.0 or 8.1? My ASUS has an A-10 APU and NVidia with 7660M/7670G switchable graphics. I'm running the latest catalyst drivers from AMD, 14.4 I believe.
 

My Computer

System One

  • OS
    Windows 10 Education 64 Bit
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    Asus
    CPU
    AMD Phenom II X4 980 Black Edition Deneb 3.7GHz
    Motherboard
    ASUS M4N68T-M V2 µATX Motherboard
    Memory
    8GB 4GBx2 Kingston PC10600 DDR3 1333 Memory
    Graphics Card(s)
    NVIDIA Geforce GT640 2 Gig DDR3 PCIe
    Sound Card
    VIA VT1708s High Definition Audio 8-channel Onboard
    Monitor(s) Displays
    22" LG E2242 1080p and 2 19" I-INC AG191D
    Screen Resolution
    1280x1024 - 1920x1080 - 1280x1024
    Hard Drives
    Crucial MX100 256 GB SSD and 500 GB WD Blue SATA
    PSU
    Thermaltake TR 620
    Case
    Power Up Black ATX Mid-Tower Case
    Cooling
    Stock heatsink fan
    Keyboard
    Logitech Wireless K350 Wave
    Mouse
    Logitech M570 Trackball and T650 TouchPad
    Internet Speed
    80 Mbps Down 30 Mbps Up
    Browser
    Internet Explorer 11
    Antivirus
    Windows Defender
    Other Info
    HP DVD1040e Lightscribe - External USB2

Gking19

New Member
Posts
8
#8
OK, on some laptops a utility is needed for the special FN keys to work. If none of them worked I would have gone down that road. Is this a factory OEM install? If yes was it originally 8.0 or 8.1? My ASUS has an A-10 APU and NVidia with 7660M/7670G switchable graphics. I'm running the latest catalyst drivers from AMD, 14.4 I believe.
The problem isn't only the Fn keys though, and this method has worked previously before. It's only just recently that I noticed that any method I try does not allow me to change the brightness.

As for your question, I believe it's OEM? Could you please explain what that means, I'm not familiar with the term. Also, my laptop originally ran 8.0, and I updated to 8.1 when it was released, and I could adjust brightness before and after the update, however long ago the release was. This problem only occurred recently, within the past week or so.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

alphanumeric

slightly off center
VIP Member
Guru
Gold Member
#9
OEM stands for Original Equipment Manufacturer, I was just asking if it was a factory install or did you install it? The upgrade to 8.1 will sometimes break things, but it sounds like it worked fine after the upgrade so it wasn't that. Normally I would recommend installing the driver offered by the laptop manufacturer, especially if that laptop has mixed dual graphics, like Intel/NVidia etc. Yours is all AMD so the AMD driver from AMD should be fine, like it was for me. You could try downloading and installing a driver from here, Download Drivers
 

My Computer

System One

  • OS
    Windows 10 Education 64 Bit
    Computer type
    PC/Desktop
    System Manufacturer/Model Number
    Asus
    CPU
    AMD Phenom II X4 980 Black Edition Deneb 3.7GHz
    Motherboard
    ASUS M4N68T-M V2 µATX Motherboard
    Memory
    8GB 4GBx2 Kingston PC10600 DDR3 1333 Memory
    Graphics Card(s)
    NVIDIA Geforce GT640 2 Gig DDR3 PCIe
    Sound Card
    VIA VT1708s High Definition Audio 8-channel Onboard
    Monitor(s) Displays
    22" LG E2242 1080p and 2 19" I-INC AG191D
    Screen Resolution
    1280x1024 - 1920x1080 - 1280x1024
    Hard Drives
    Crucial MX100 256 GB SSD and 500 GB WD Blue SATA
    PSU
    Thermaltake TR 620
    Case
    Power Up Black ATX Mid-Tower Case
    Cooling
    Stock heatsink fan
    Keyboard
    Logitech Wireless K350 Wave
    Mouse
    Logitech M570 Trackball and T650 TouchPad
    Internet Speed
    80 Mbps Down 30 Mbps Up
    Browser
    Internet Explorer 11
    Antivirus
    Windows Defender
    Other Info
    HP DVD1040e Lightscribe - External USB2

TairikuOkami

Be nice to all, please?!
Pro User
Trnava

Posts
683
#10

My Computer

System One

  • OS
    Win 8.1.1 Pro x64
    Computer type
    Laptop
    System Manufacturer/Model Number
    Lenovo E525
    CPU
    AMD A4-3300M @ 2,0GHz
    Memory
    6GB DDR3 1333MHz
    Graphics Card(s)
    AMD Radeon HD 6480G 512MB shared
    Sound Card
    Creative Sound Blaster X-Fi Surround 5.1
    Screen Resolution
    1366x768
    Hard Drives
    WD 465GB
    Cooling
    Fusion Tweaker
    Keyboard
    Logitech K360
    Mouse
    Logitech M705
    Internet Speed
    50/50 MBps
    Browser
    Yandex
    Antivirus
    No AV & No Firewall
    Other Info
    Headphones: Sennheiser RS170

Gking19

New Member
Posts
8
#11
Do you have power management driver installed?

Satellite L875D-S7332 Support | Toshiba

Select - Drivers and Updates - Power Management - Toshiba eco Utility
Yes, I have it installed, that was some of the crapware that came with the computer when I got it, never bothered to remove it.

@Alpha
So yes, my computer is OEM, to answer your original question.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

Gking19

New Member
Posts
8
#12
I performed a system restore to August 16th, and that completely fixed the problem. I will start to reinstall updates (which were the majority of removed items) and see if one of them is causing the problem. I'll post the results here so someone else with the same problem may find a solution.

Also, thank you to everyone who posted offering their advice, I appreciate the help.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D

MilesAhead

Eclectician
VIP Member
Pro User
Posts
2,130
#13
You are welcome. Thanks for posting what you find. :)
 

My Computer

System One

  • OS
    Windows 8.0 x64
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satelite C55D-A Laptop
    CPU
    AMD EI 1200
    Memory
    4 gb DDR3
    Graphics Card(s)
    Raedon 340 MB dedicated Ram
    Monitor(s) Displays
    Built in
    Screen Resolution
    1366 x 768
    Hard Drives
    640 GB (spinner) Sata II
    Keyboard
    Built in
    Mouse
    Touch pad

Gking19

New Member
Posts
8
#14
Well, apparently they were important updates I removed. Restarted my computer and saw the "Do not turn off your computer" jazz. Let it do it's thing, and was still able to adjust brightness after the updates, so update away anyone who's hesitant, it should not cause any problems :p.
 

My Computer

System One

  • OS
    Windows 8.1 64-bit
    Computer type
    Laptop
    System Manufacturer/Model Number
    Toshiba Satellite L875D