I found a fix for the 'failed to get size of gamma for output default' which was causing the problems keeping the higher resolutions from being used.
In using xrandr according to the https://wiki.ubuntu.com/X/Config/Resolution guide to add higher resolutions and xrandr returns the gamma error, I was able to fix the problem by adding --gamma 1:1:1 to the xrandr --output line, as follows: xrandr --output default --gamma 1:1:1 --mode 1280x1024 where xrandr returns the output name as default, and the modename is from a newly defined, higher resolution mode. I got this to work properly with my Etronix 1701B 1280x1024 pixel 17" LCD monitor from an Ubuntu 13.04 virtual machine which was reporting the gamma problem and display name 'default', with a Bodhi 2.0 virtual machine and a Bodhi 2.0 Live CD, all three exhibiting the 'default' display and 'failed to get size of gamma for output default'. The display does not immediately resize, but the new mode can be chosen from the arandr GUI. After selection, when the dialog box pops up, I select to keep that selection. On the next log out or restart, the default is at 1280x1024 as selected before, even at the login screen and at the desktop. Note: several modes greater than the previous 1024x768 maximum were also allowed, including modes which actually exceded the maximum of my monitor. I think this bug report can be closed, with proper documentation. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to x11-utils in Ubuntu. https://bugs.launchpad.net/bugs/1078695 Title: xrandr : Failed to get size of gamma for output default Status in “x11-utils” package in Ubuntu: New Bug description: I have been tracking in the Ubuntu & Linux Mint forums when people have problems with the resolution of their screens not being able to be set to the native resolution of their displays. Normally, that can be fixed by either xrandr or xorg.conf settings, but occasionally when xrandr is typed on a line by itself to check the configuration of the X display, the return is [code]$ xrandr xrandr : failed to get size of gamma for output default Screen 0: blah blah default : more blah blah[/code]When this has occurred, the output maximum resolution can NOT be changed, and I haven't found any way to fix the problem. [background] My particular rig is a custom built with a BIOStar N68S3B motherboard, AMD Athlon II x3 processor, 8G RAM, nVidia GeForce 7025 display adapter on the motherboard, Etronix 1701B display. I have fought getting my maximum resolution (1280x1024) on this monitor since 7.10 Gutsy Gibbon, and used a custom xorg.conf file until it stopped working, around 9.10, and have used xrandr since. (I stopped using Ubuntu as my primary OS of choice when Unity came out, because my rig did not support Compiz or graphics acceleration. Xubuntu, Linux Mint Debian Edition, or Debian are my primaries now.) The EDID on this monitor is not read correctly/has never been read correctly, and I have always been stuck with the default resolution on Live media, except occasionally on Puppy or Elive, through two different main machines. My first Linux install was on an eMachines T5212 with an nVidia GeForce 6200 128M graphics memory, 2G RAM.[/Background] I noticed that on a Bodhi 2.0 Live media that the xrandr did not work because x11-xserver-utils package was not installed. I was checking out the Live media, because my Bodhi 2.0 virtual machine exhibits the same problems reported by laptop users, that is, the Failed to get size of gamma for output default and unable to use xrandr to add a higher resolution display. When I added the x11-xserver-utils package to the Live running install, I could use xrandr to properly get the size of gamma and reset the display to 1280x1024. I re-installed from the SAME live media to my Bodhi VirtualBox VM, still the same graphics problem. x11-xserver-utils was installed during updates, but xrandr still returned no gamma, display as 'default', and no ability to set resolution higher than 1024x768 detected at install. I still have about 2 weeks laid-off from my primary work, so if there is anything further I can do to help, just let me know. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/x11-utils/+bug/1078695/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
