changing screen brightness broken in Xubuntu (12.04 and 14.04)

[Damian Kleiman]

Xgamma might be "obsolete" like you say, but here it works great.

Regards,
Damian

2014-04-27 7:38 GMT-03:00 PK <pliniusminor at gmail.com>:
> @ Liviu and Benedek: thanks for sharing these useful workarounds!
>
> Both of you could help further, by reporting this on Launchpad.... There are
> probably more people with your hardware, so a bug report would serve two
> purposes: it might help to solve the bug, and if not, it might help others
> with the workaround.
>
> Regards, Pjotr.
>
>
> 2014-04-27 11:51 GMT+02:00 Benedek Imre <nucleo at indamail.hu>:
>
>> Try this solution:
>> http://itsfoss.com/fix-brightness-ubuntu-1310/
>> It worked on my Dell Inspiron laptop with Intel graphics.
>> Good luck!
>>
>> -- Eredeti üzenet --
>> Feladó: Liviu Andronic <landronimirc at gmail.com>
>> Címzett: Xubuntu Development Discussion <xubuntu-devel at lists.ubuntu.com>
>> Elküldve: 2014. április 27. 2:28
>> Tárgy : Re: changing screen brightness broken in Xubuntu (12.04 and 14.04)
>>
>>
>> On Sat, Apr 26, 2014 at 10:26 AM, PK <pliniusminor at gmail.com> wrote:
>> > Try this:
>> >
>> > https://sites.google.com/site/easylinuxtipsproject/display#TOC-Brightness-of-the-display-is-wrong-and-not-adjustable
>> >
>> > Those tweaks work fine on my machines. :-)
>> >
>> > Not really a Linux error, this; it has to do with BIOS / UEFI that's not
>> > standard-compliant.
>> >
>> Thanks for the tips, but unfortunately none worked for me. I tried
>> several workarounds.
>> - with no obvious success:
>> GRUB_CMDLINE_LINUX="acpi_osi=Linux"
>>
>> and
>> update-grub
>>
>> - the following has no effect:
>> xbacklight -set 20
>>
>> - and neither does this help:
>> root at liv-inspiron:/home/geek# lspci | grep -i vga
>> 00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT
>> Integrated Graphics Controller (rev 09)
>> 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
>> [AMD/ATI] Venus PRO [Radeon HD 8850M] (rev ff)
>> root at liv-inspiron:/home/geek# setpci -s 00:02.0 F4.B=20
>> root at liv-inspiron:/home/geek# setpci -s 03:00.0 F4.B=20
>>
>>
>> Any ideas on what else could be wrong? Thanks,
>> Liviu
>>
>> > Regards, Pjotr.
>> >
>> >
>> > 2014-04-26 9:56 GMT+02:00 Liviu Andronic <landronimirc at gmail.com>:
>> >>
>> >> Dear all,
>> >> For several releases now (12.04 and 14.04) and across several machines
>> >> (Lenovo 32-bit and Dell 64-bit), changing brightness settings is
>> >> broken. It doesn't work whether I use the laptop buttons to modify
>> >> screen brightness (to get the notification changing the percentage,
>> >> but actual brightness NOT move one bit) or the Brightness panel-plugin
>> >> from xfce4-power-manager (nothing really happens).
>> >>
>> >> Is this a known issue (or should I report it to Launchpad)? But more
>> >> importantly, how can I change screen brightness in Xubuntu (install
>> >> gnome-power-manager, etc.)?
>> >>
>> >> Regards,
>> >> Liviu
>> >>
>> >> --
>> >> Do you know how to read?
>> >> http://www.alienetworks.com/srtest.cfm
>> >> http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader
>> >> Do you know how to write?
>> >> http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail
>> >>
>> >> --
>> >> xubuntu-devel mailing list
>> >> xubuntu-devel at lists.ubuntu.com
>> >> https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel
>> >
>> >
>> >
>> > --
>> > xubuntu-devel mailing list
>> > xubuntu-devel at lists.ubuntu.com
>> > https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel
>> >
>>
>>
>>
>> --
>> Do you know how to read?
>> http://www.alienetworks.com/srtest.cfm
>> http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader
>> Do you know how to write?
>> http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail
>>
>> --
>> xubuntu-devel mailing list
>> xubuntu-devel at lists.ubuntu.com
>> https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel
>>
>>
>> --
>> xubuntu-devel mailing list
>> xubuntu-devel at lists.ubuntu.com
>> https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel
>>
>
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