**Intel i7-8700k (Coffe-lake),Mother plank : ROG(Maximus X Hero)OS :Ubuntu-Gnome 16.04** i booted My new PC v Ubutnu-Gnome16.04 , after ~ installation the screen resolution is 1024x768(4:3)--and display screen is shown "Unknown Display".I havent installed anything in my new OS.My Monitor-CPU connecting Cable is DP(Pin Cable).

You are watching: Xrandr failed to get size of gamma for output default

I have tried v "Force create brand-new resolution":

a)cvt 1366 768 60 b)xrandr --newmode ""Then Error throws together :

"xrandr : failure to get size of gamma for calculation default". I desire perfect resolution to it is in fit for my desktop computer screen deserve to Anyone aid me ~ above this

ubuntu resolution screen gnome xrandr
boost this concern
edited Nov 20 "17 at 13:00
Harish Bodduna
asked Nov 20 "17 at 12:07

Harish BoddunaHarish Bodduna
11311 gold badge22 silver- badges88 bronze badges
add a comment |

3 answers 3

active oldest Votes
Based on information in this article I"ve discovered answer.

You require to add "i915.alpha_support=1" booting parameter to lar (Info from here) :

Log in to the system and also start a terminal window (Applications->Accessories->Terminal).

In the terminal window at the $ prompt, go into the command: sudo gedit /etc/default/grub

Enter your password as soon as prompted by . (If the file /etc/default/grub shows up to be empty or does no exist, view the indict for previously releases above).

In the editor window, usage the arrowhead keys to move the cursor come the line beginning with "GRUB_CMDLINE_LINUX_DEFAULT" then modify that line, including your parameter(s) to the text inside the double-quotes after ~ the indigenous "quiet splash". (Be sure to add a room after "splash" before adding your new parameter.)

it have to look prefer this "quiet splash i915.alpha_support=1"

Click the save button, climate close the editor window.

In the terminal home window at the $ prompt, get in the command: sudo update-grub Restart the system.

improve this answer
edited Nov 23 "17 in ~ 0:18

3,64233 gold badges1212 silver badges2020 bronze badges
reply Nov 22 "17 in ~ 22:44

6888 bronze title
include a comment |
An price I discovered on the askubuntu forum <1> solved the problem for me:

Open the following: sudo nano /etc/default/grub

Find the complying with line, uncomment the and change it come 1920x1080: #GRUB_GFXMODE=640x480 --> GRUB_GFXMODE=1920x1080

Update it: sudo update-grub

Then restart her computer: sudo reboot

<1> https://askubuntu.com/a/1167437/724074

enhance this answer
reply Mar 22 in ~ 16:06

19222 silver- badges1010 bronze badges
include a comment |
In my instance I had nvidia drivers issues after changing system default gcc.

You have your system compiler collection to clang/llvm however gcc 7.5 is needed.Please collection your cc ago to gcc-7.5 using update-alternatives

improve this prize
answered Mar 2 at 16:33

George VinokhodovGeorge Vinokhodov
18711 gold badge22 silver- badges99 bronze badges
add a comment |

your Answer

Thanks for contributing response to stack Overflow!

Please be sure to answer the question. Carry out details and also share her research!

But avoid

Asking because that help, clarification, or responding to other answers.Making statements based on opinion; earlier them increase with recommendations or personal experience.

To learn more, see our tips on writing an excellent answers.

See more: Copy Itunes Playlist To Sd Card, How To Move Songs From Itunes To A Microsd Card

Draft saved
Draft discarded

Sign increase or log in in

sign up using Google
authorize up making use of Facebook
authorize up using Email and Password

Post together a guest

email Required, yet never shown

Post together a guest


Required, however never shown

article Your price Discard

By click “Post your Answer”, you agree to our regards to service, privacy policy and also cookie plan

Not the prize you're spring for? Browse other questions tagged ubuntu resolution display gnome xrandr or asking your own question.

The Overflow Blog
Featured on Meta
'password authentication failed because that user "postgres"'
xrandr dimension 1920x1080 not discovered in available modes ubuntu
getting "output eDP-1 not found" native xrandr after ~ upgrading come Ubuntu 17.10 when I try to readjust brightness
avoid parsing Xrandr output
Is over there an xrandr function/interface for controlling brightness?
hot Network inquiries more hot concerns

inquiry feed
i ordered it to RSS
question feed To subscribe to this RSS feed, copy and paste this URL into your RSS reader.

ridge Overflow
stack Exchange Network
site style / logo design © 2021 ridge Exchange Inc; user contributions licensed under cc by-sa. Rev2021.9.27.40313

Stack Overflow works best with JavaScript allowed

her privacy

By clicking “Accept every cookies”, friend agree ridge Exchange have the right to store cookie on your maker and disclose information in accordance with our Cookie Policy.