@ 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 <[email protected]>: > 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 <[email protected]> <[email protected]> > *Címzett: *Xubuntu Development Discussion > <[email protected]><[email protected]> > *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 <[email protected]> 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@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@liv-inspiron:/home/geek# setpci -s 00:02.0 F4.B=20 > root@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 <[email protected]>: > >> > >> 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 > >> [email protected] > >> https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel > > > > > > > > -- > > xubuntu-devel mailing list > > [email protected] > > 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 > [email protected] > https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel > > > -- > xubuntu-devel mailing list > [email protected] > https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel > >
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