**Intel i7-8700k (Coffe-lake),Mother board : ROG(Maximus X Hero)OS :Ubuntu-Gnome 16.04** I booted My new PC with Ubutnu-Gnome16.04 , after installation the screen resolution is 1024×768(4:3)–and 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 with “Force create new resolution”:
a)cvt 1366 768 60 b)xrandr –newmode “”Then Error throws as :
“xrandr : Failed to get size of gamma for output default”. I want perfect resolution to be fit for my desktop screen Can Anyone help me on this
ubuntu resolution display 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 info in this article I”ve found answer.
You need to add “i915.alpha_support=1” booting parameter to GRUB (Info from here) :
Log in to the system and start a terminal window (Applications->Accessories->Terminal).
In the terminal window at the $ prompt, enter the command: sudo gedit /etc/default/grub
Enter your password when prompted by
In the editor window, use the arrow keys to move the cursor to the line beginning with “GRUB_CMDLINE_LINUX_DEFAULT” then edit that line, adding your parameter(s) to the text inside the double-quotes after the words “quiet splash”. (Be sure to add a SPACE after “splash” before adding your new parameter.)
it should look like this “quiet splash i915.alpha_support=1”
Click the Save button, then close the editor window.
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In the terminal window at the $ prompt, enter the command: sudo update-grub Restart the system.
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edited Nov 23 “17 at 0:18
Aron
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answered Nov 22 “17 at 22:44
marekbrzemarekbrze
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An answer I found on the askubuntu forum <1> solved the problem for me:
Open the following: sudo nano /etc/default/grub
Find the following line, uncomment it and change it to 1920×1080: #GRUB_GFXMODE=640×480 –> GRUB_GFXMODE=1920×1080
Update it: sudo update-grub
Then restart your computer: sudo reboot
<1> https://askubuntu.com/a/1167437/724074
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answered Mar 22 at 16:06
doldnhdoldnh
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In my case I had nvidia drivers issues after changing system default gcc.
You have your system compiler set to clang/llvm but gcc 7.5 is needed.Please set your cc back to gcc-7.5 using update-alternatives
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answered Mar 2 at 16:33
George VinokhodovGeorge Vinokhodov
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