**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
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edited Nov 20 "17 at 13:00
Harish Bodduna
asked Nov 20 "17 at 12:07
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Harish BoddunaHarish Bodduna
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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.


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edited Nov 23 "17 in ~ 0:18
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marekbrzemarekbrze
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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


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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


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answered Mar 2 at 16:33
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George VinokhodovGeorge Vinokhodov
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