<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><style></style></head><body style=";">Try this solution: <a href="http://itsfoss.com/fix-brightness-ubuntu-1310/" style="text-decoration:none;" id="docs-internal-guid-4ba054cb-a296-39a4-9bec-b02bd4891d3f">http://itsfoss.com/fix-brightness-ubuntu-1310/</a> It worked on my Dell Inspiron laptop with Intel graphics. Good luck! <blockquote style="PADDING-LEFT: 10px; MARGIN-LEFT: 5px; BORDER-LEFT: #6497CE 2px solid; MARGIN-RIGHT: 0px">-- Eredeti üzenet -- <div style="font-color: black">Feladó: <a href="mailto:landronimirc@gmail.com">Liviu Andronic <landronimirc@gmail.com></a></div><div>Címzett: <a href="mailto:xubuntu-devel@lists.ubuntu.com">Xubuntu Development Discussion <xubuntu-devel@lists.ubuntu.com></a></div><div>Elküldve: 2014. április 27. 2:28</div><div>Tárgy : Re: changing screen brightness broken in Xubuntu (12.04 and 14.04)</div> <div class="bg" id="divMessageBody" style="height:auto;position:relative">On Sat, Apr 26, 2014 at 10:26 AM, PK <pliniusminor@gmail.com> wrote: > Try this: > <a href="https://sites.google.com/site/easylinuxtipsproject/display#TOC" target="_blank">https://sites.google.com/site/easylinuxtipsproject/display#TOC</a>-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 <landronimirc@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? >> <a href="http://www.alienetworks.com/srtest.cfm" target="_blank">http://www.alienetworks.com/srtest.cfm</a> >> <a href="http://goodies.xfce.org/projects/applications/xfce4-dict#speed" target="_blank">http://goodies.xfce.org/projects/applications/xfce4-dict#speed</a>-reader >> Do you know how to write? >> <a href="http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e" target="_blank">http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e</a>-mail >> >> -- >> xubuntu-devel mailing list >> xubuntu-devel@lists.ubuntu.com >> <a href="https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel" target="_blank">https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel</a> > > > > -- > xubuntu-devel mailing list > xubuntu-devel@lists.ubuntu.com > <a href="https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel" target="_blank">https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel</a> > -- Do you know how to read? <a href="http://www.alienetworks.com/srtest.cfm" target="_blank">http://www.alienetworks.com/srtest.cfm</a> <a href="http://goodies.xfce.org/projects/applications/xfce4-dict#speed" target="_blank">http://goodies.xfce.org/projects/applications/xfce4-dict#speed</a>-reader Do you know how to write? <a href="http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e" target="_blank">http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e</a>-mail -- xubuntu-devel mailing list xubuntu-devel@lists.ubuntu.com <a href="https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel" target="_blank">https://lists.ubuntu.com/mailman/listinfo/xubuntu-devel</a> </div></blockquote></body></html>