On Sun, Apr 27, 2014 at 4:35 AM, Damian Kleiman <[email protected]> wrote: > 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. > Having read from man xgamma that "Note that the xgamma utility is obsolete and deficient, xrandr should be used with drivers that support the XRandr extension.", I decided to check out man xrandr. Then following http://askubuntu.com/questions/45153/is-there-an-alternative-to-redshift-and-f-lux-which-only-dims-the-screen/48952#48952 , the below works perfectly fine on my laptop:
xrandr --output eDP1 --brightness 0.2 So it seems to me that the hardware issue, if it actually exists, can be worked around. Should I report this brightness issue more formally on Launchpad? Regards, Liviu > 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 -- 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
