unable to adjust screen brightness

hydrurga · 05-04-2017, 07:05 AM

Quote:

Originally Posted by juntjoo

thanks. I tested all the way down to xxx.63 and got nothing. what other ideas might you have?

All my suggestions so far were based on your comment "I used to be able to before but not anymore." Something has obviously changed. It might just have been further back than we think, or caused by some other software or configuration change.

Personally, I would install and test a later series kernel, say the latest 4.10 series kernel, and try that out in case better support for your hardware has been added since the 4.4 range.

juntjoo · 05-04-2017, 09:17 PM

Quote:

Originally Posted by hydrurga

All my suggestions so far were based on your comment "I used to be able to before but not anymore." Something has obviously changed. It might just have been further back than we think, or caused by some other software or configuration change.

Personally, I would install and test a later series kernel, say the latest 4.10 series kernel, and try that out in case better support for your hardware has been added since the 4.4 range.

Thanks. Will this be available automatically with system updates or is this something I have to look for?

Shadow_7 · 05-04-2017, 09:33 PM

It probably wouldn't take much to give xbacklight a gui via tcl/tk. A simple slider from 0% to 100%. I recall something around 3 lines of code for that back when I had a vaio and needed to use sonypi. Although it didn't work for my particular model at the time.

If you have not new hardware that is "popular" you probably didn't install something.

$ apt-cache show acpi-support

Code:

Package: acpi-support
Version: 0.142-6
Installed-Size: 199
Maintainer: Debian Acpi Team <pkg-acpi-devel@lists.alioth.debian.org>
Architecture: all
Depends: acpi-support-base (>= 0.109-1), x11-xserver-utils, acpid (>= 1.0.4), lsb-base (>= 1.3-9), pm-utils
Recommends: rfkill, acpi-fakekey
Suggests: radeontool, vbetool, xinput, xscreensaver | gnome-screensaver | kscreensaver | xautolock | xlock | xtrlock | i3lock
Breaks: uswsusp (<= 0.2)
Description-en: scripts for handling many ACPI events
 This package contains scripts to react to various ACPI events. It only
 includes scripts for events that can be supported with some level of
 safety cross platform.
 .
 It is able to:
  * Detect loss and gain of AC power, lid closure, and the press of a
    number of specific buttons (on Asus, IBM, Lenovo, Panasonic, Sony
    and Toshiba laptops).
  * Suspend, hibernate and resume the computer, with workarounds for
    hardware that needs it.
  * On some laptops, set screen brightness.
 .
 Besides some system tools acpi-support recommends vbetool to be able to power
 off the screen and some screensavers to be able to lock the screen on lid
 close.
Description-md5: 1c6070eeef71bf603f64536f1fe139de
Tag: admin::automation, admin::hardware, admin::power-management,
 hardware::input, hardware::input:keyboard, hardware::laptop,
 hardware::power, hardware::power:acpi, hardware::video,
 implemented-in::c, implemented-in::shell, role::program, system::TODO,
 system::laptop, use::configuring, use::driver
Section: admin
Priority: optional
Filename: pool/main/a/acpi-support/acpi-support_0.142-6_all.deb
Size: 48750
MD5sum: 446ec114782a0ce3d4bec4d43d105ccf
SHA1: 5ef43810568cc12c9d19c2c64094af0cca266126
SHA256: 009688226752e9fdb91c99b44b392f5323372f76285fb9920f0f42c7e24072dd

hydrurga · 05-05-2017, 05:15 AM

You can download Ubuntu kernels from here:

http://kernel.ubuntu.com/~kernel-ppa/mainline/

(at date of writing: v4.10.14, you would need the following 2 packages)

http://kernel.ubuntu.com/~kernel-ppa...1501_amd64.deb

http://kernel.ubuntu.com/~kernel-ppa...031501_all.deb