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
