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Xrandr Failed To Get Size Of Gamma For Output Default, Failed To Get Size Of Gamma For Output Default

admin by admin
September 27, 2021
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**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

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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 . (If the file /etc/default/grub appears to be empty or does not exist, see the instructions for earlier releases above).

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.

See more: Verizon Fios Quantum Gateway Ac1750 With Z-Wave Support, Verizon Fios Quantum Gateway Ac1750 With Z

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

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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

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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

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