changing screen brightness broken in Xubuntu (12.04 and 14.04)

[PK]

@ 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> <landronimirc at gmail.com>
> *Címzett: *Xubuntu Development Discussion <xubuntu-devel at lists.ubuntu.com><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
>
>
> --
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> xubuntu-devel at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel
>
>
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