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. |
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? |
Check with several livecds if certain laptop feature works.
if not use xrandr. like on my asusg75vw, with broken uefi after 2 years of kernel.org bugs / gentoo bugs, i still have to use such hacks. kernel.org bugtracker has more explanations, plase search and read my bug reports there. it'S always the same. examples: Quote:
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 |
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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