**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
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
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
Aron
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reply Nov 22 "17 in ~ 22:44
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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reply Mar 22 in ~ 16:06
doldnhdoldnh
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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
George VinokhodovGeorge Vinokhodov
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