My brightness also stopped working on my last update, but i fixed it by using the following command to make it brighter:
xgamma -gamma 1 I tried several numbers between 0 and 1 (0.25, 0.5, etc) and i prefered one on my laptop. Regards, Damian 2014-04-26 21:26 GMT-03:00 Liviu Andronic <[email protected]>: > 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
