I'm still experiencing this issue with 16.04 LTS, BIOS 1.4.2 and kernel
4.4.0-21-generic.
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https://bugs.launchpad.net/bugs/1560524
Title:
Latitude E7470 crashes in DRM
Kernel version reverse-bisect showed that it works with 4.0rc1 and
higher. I will do a commit reverse-bisect when I have time.
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https://bugs.launchpad.net/bugs/1454207
The default ubuntu kernel (currently 3.19.0-16) does not work for me.
In /sys/class/backlight there is only
intel_backlight -
../../devices/pci:00/:00:02.0/drm/card0/card0-eDP-1/intel_backlight
However, with 4.1-rc3 there is
acpi_video0 -
Okay, my upstream kernel test was a little naive.
When I was bisecting the problem, I noticed that my test to control the
brightness failed even with kernels that worked before.
So I noticed that I still had a /usr/share/X11/xorg.conf.d/80-intel.conf file
with:
Section Device
Identifier
Just tested it with 4.1 rc3 but the problem remains the same.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Filed that bug here:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454207
Bedmux, thanks for the hint. I will try to find out and correct this.
But I don't use that key anyway.
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Public bug reported:
Fn-shortcuts work and the value in
/sys/class/backlight/intel_backlight/brightness changes, but is has no physical
effect.
Only setting /sys/class/backlight/intel_backlight/brightness to 0 turns the LCD
off, changing it to any other value turns it on again.
I tried to set
This bug also affects me. I also have a Samsung 730U3E notebook.
I just tested the upstream kernel 4.1-rc2 on vivid, and the problem still
exists.
** Tags removed: needs-upstream-testing
** Tags added: kernel-bug-exists-upstream kernel-bug-exists-upstream-4.1-rc2
** Changed in: linux (Ubuntu)
And please tell me what info you still need, I really want this to be
fixed.
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https://bugs.launchpad.net/bugs/1399823
Title:
[Samsung NP730U3E-S01PL] LCD backlight doesn't
Brightness control also does not work on Samsung 730U3E.
I'm running 15.04 with 3.19.0-15 kernel and having the same symptoms as
reported and none of the listed kernel boot parameters show any effect.
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