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Series 7 CHRONOS Laptop Brightness Problem

Discussion in 'Linux Hardware' started by DevynKo, Jan 11, 2019.

  1. DevynKo

    DevynKo New Member

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    So my laptop will only be in full brightness when I turn on and boot up while its plugged in to the power. If I turn it on while it not plugged in, the screen is stuck not so bright. This was fixed previously when I had windows 10 installed by changing something in the registry. I forget what it was but it worked. Now I need a fix for linux. I would appreciate any help.


    Specs

    Samsung Series 7 Chronos Laptop
    OS: Ubuntu 18.04.1 LTS
    Processor: Intel® Core™ i7-3635QM CPU @ 2.40GHz × 8
    Graphics: Intel® Ivybridge Mobile
    Gnome: 3.28.2
    OS type: 64-bit


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  2. wizardfromoz

    wizardfromoz Super Moderator
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    G'day @DevynKo and welcome to linux.org :)

    Is your Ubuntu Desktop aka GNOME or MATE or other desktop?

    If you are not sure, then go to Terminal (Ctrl-Alt-t) and enter

    Code:
    echo $DESKTOP_SESSION
    and tell us the output.

    Cheers

    Chris Turner
    wizardfromoz
     
  3. Bayou Bengal

    Bayou Bengal Active Member

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    If it did this in Win 10 as well it might be a Bios setting that needs to be changed.
     
  4. DevynKo

    DevynKo New Member

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    When I put in that command it just says ubuntu.
     
  5. DevynKo

    DevynKo New Member

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    I've looked countless times, thats why I ended up finding it was registry issue in windows 10.
     
  6. wizardfromoz

    wizardfromoz Super Moderator
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    OK, so it's GNOME DE (desktop environment) - you have a launcher panel at left of screen, the word Activities at top left, we'll call that a Dash after its predecessor, you can type in searches, and a 9 dots shaped like a square at bottom left for Show Applications, yes?

    Wiz
     
    #6 wizardfromoz, Jan 12, 2019
    Last edited: Jan 12, 2019
  7. wizardfromoz

    wizardfromoz Super Moderator
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    Assuming the above, go to either of Activities or The Dash and type in Settings, it will open, and there will appear an icon in your Launch bar at left with a red-handled wrench on a cogged wheel. Right-click on that and add to favorites, that will lock it to your launch bar.

    In Settings go down to Power and click, check all brightness options are optimal.

    Go down a couple further to Devices, choose Display, make sure night light is off.

    See how you go, and if no joy we'll look further.

    Cheers

    Wizard
     
  8. DevynKo

    DevynKo New Member

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    Did all of this still no progress.
     
  9. wizardfromoz

    wizardfromoz Super Moderator
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    Then as Bayou Bengal suggested, it may be a BIOS problem, have you been in there to look?

    Wizard
     
  10. DevynKo

    DevynKo New Member

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    Yes, Nothing Related to the problem.
     
  11. wizardfromoz

    wizardfromoz Super Moderator
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    1. Can you provide me with the output from Terminal for the following

    Code:
    inxi -G
    2. Does your keyboard have any dedicated function keys for light settings, eg F10, F11, F12?

    Thanks

    Wizard
     
  12. DevynKo

    DevynKo New Member

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    Yes F2 and F3. And these buttons dont do anything either. The UI shows that Im changing the brightness, but the screen stays the same wether its plugged in or not.
     
  13. wizardfromoz

    wizardfromoz Super Moderator
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    Wiz
     
  14. DevynKo

    DevynKo New Member

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    Sorry, must have looked over that part. This is the output.


    Graphics:
    Card-1: Intel 3rd Gen Core processor Graphics Controller
    Card-2: Advanced Micro Devices [AMD/ATI] Mars [Radeon HD 8670A/8670M/8750M]
    Display Server: x11 (X.Org 1.19.6 ) driver: i915
    Resolution: [email protected]
    OpenGL: renderer: Mesa DRI Intel Ivybridge Mobile
    version: 4.2 Mesa 18.0.5
     
  15. wizardfromoz

    wizardfromoz Super Moderator
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    Thanks for that @DevynKo :)

    I'll be perfectly honest with you, namely that graphics is not my forte, rather multi-multi-booting and to an extent general troubleshooting (good at Googling :p).

    Someone else may have a better answer (hope so)

    If you'll bear with me, we can see if a couple of things work on a temporary basis, and so eliminate possibilities?

    For the benefit of The Viewers and Helpers, "xbacklight" works with Intel, but not AMD Radeon.

    Can you give me the output for

    Code:
    xrandr -q | grep " connected"
    ?

    Now that will have a description at left for the display, mine is eDP-1, others might include LVDS1 and numerous others.

    So in case we are online and offline at different times, you could try the following - substitute your description for mine:

    Code:
    xrandr --output eDP-1 --brightness 0.5
    
    #and
    
    xrandr --output eDP-1 --brightness 1.0
    The lowest is 0.0 which is black, 1.0 is full brightness, and increments are by 0.1, ie 0.5, 0.6, 0.7 etc.

    Let us know if there are any changes, but be aware this will only last for your session, won't survive a reboot unless we tweak it.

    Cheers

    Wizard
     
  16. DevynKo

    DevynKo New Member

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    These do change the brightness, but the 1.0 full brightness, is capped at the brightness its booted into. Almost like the max brightness is set different depending on if I boot plugged in or not.

    Sorry for the late reply.
     
    #16 DevynKo, Jan 16, 2019
    Last edited: Jan 16, 2019
  17. DevynKo

    DevynKo New Member

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    Got any more ideas?
     
  18. wizardfromoz

    wizardfromoz Super Moderator
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    Phew! Had a one-day day trip and am just about caught up :)

    If that level of brightness is acceptable as a workaround, we could incorporate that into a script or function that would run at boot. That might take me a day or so.

    Another possibility is to download and burn a different type of Linux, and add to the stick "Persistence". Then boot from the stick, disable screensaving and powersaving options and run for a couple of hours on and off battery, to establish the likely culprit. You can read about Persistence by Googling

    persistence pendrivelinux

    Just be aware that despite the fact that we jagged linux.org as a domain name, that we are not an official organ of Linux. Every helper here is a volunteer with work lives, family lives, and commitments, but we give freely of our time where we can just because we love Linux and like to help. OK? ;)

    Wiz
     

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