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Old 11-17-2017, 01:12 PM   #1
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Registered: Jul 2016
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Can't change the Brightness on Deepin Live USB

I have a live usb of Deepin 15.4.1 that I made using the Deepin Boot Maker. I'm using an hp laptop that is a couple of years old and it satisfies all of the system requirements for this distro.

My problem is that I can't change the brightness of the screen at all in the live session. It starts off with the max brightness setting, I can't change this setting using the brightness keys on my keyboard, and even though I can move the brightness slider back and forth in the settings menu, it doesn't actually change the brightness at all. When I go back to that particular brightness slider it's back to where it was before at the highest setting.

Another problem that I have is that once I put the pc in suspend mode, I can't get out of it. When a press a key on the keyboard it plays a sound effect, but the screen remains black. I don't know if this has anything to do with the brightness problem, but I just thought it might be helpful in pin-pointing the issue.

Any help will be greatly appreciated, thanks in advance.
Old 05-05-2018, 05:14 PM   #2
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Registered: May 2018
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Hi, did you manage to solve it ? I am having the same issue with my dell xps 13. I also noticed that when I enter ls /sys/class/backlight its empty. It doesnt list any device.
Can anyone help?
Old 05-07-2018, 10:25 AM   #3
Registered: Dec 2017
Location: _Austro_Bavaria_
Distribution: gentoo / linux mint
Posts: 433

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Check with several livecds if certain laptop feature works.

if not use xrandr. like on my asusg75vw, with broken uefi
after 2 years of bugs / gentoo bugs, i still have to use such hacks. bugtracker has more explanations, plase search and read my bug reports there. it'S always the same.


roman@ASUS-G75VW ~ $ grep xrandr ~/.i3/config
#xrandr --output LVDS-0 --set Backlight 75
bindsym $mod+F1 exec "xrandr --output LVDS-0 --set Backlight 1"
bindsym $mod+F2 exec "xrandr --output LVDS-0 --set Backlight 10"
bindsym $mod+F3 exec "xrandr --output LVDS-0 --set Backlight 20"
bindsym $mod+F4 exec "xrandr --output LVDS-0 --set Backlight 30"
bindsym $mod+F5 exec "xrandr --output LVDS-0 --set Backlight 40"
bindsym $mod+F6 exec "xrandr --output LVDS-0 --set Backlight 50"
bindsym $mod+F7 exec "xrandr --output LVDS-0 --set Backlight 60"
bindsym $mod+F8 exec "xrandr --output LVDS-0 --set Backlight 70"
bindsym $mod+F9 exec "xrandr --output LVDS-0 --set Backlight 80"
bindsym $mod+F10 exec "xrandr --output LVDS-0 --set Backlight 85"
bindsym $mod+F11 exec "xrandr --output LVDS-0 --set Backlight 90"
bindsym $mod+F12 exec "xrandr --output LVDS-0 --set Backlight 100"
note: i expect you can use the shell, read bash commands and manpages! or wiki.
I also expect that you can change it to your setup, as these commands were specifically created to work only on my hardware Asus g75vw by myself! do not copy and paste and than say, it does not work bla bla

Last edited by _roman_; 05-07-2018 at 10:27 AM.
Old 09-19-2018, 12:04 PM   #4
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Registered: Jul 2016
Posts: 3

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Actually, I never solved this problem. I've tried many different live cds (Debian, Ubuntu, even Manjaro!) with the same laptop and had issues with each and every single one. Finally I gave up, purchased a laptop that was Ubuntu Certified, and installed Ubuntu MATE on it. I've been using it for a few months now and it works pretty well!


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