xcalib unable to read file ''

Question

When trying to use the xcalib tool to adjust the screens color and resolution such as...

xcalib -red 1.1 10.0 100.0

I get the error

Warning - Unable to read file ''

The error started after adding the xorg .conf file

Section "Device"
   Identifier "Intel Graphics"
   Driver "intel"
EndSection

before adding this I was getting an error

Error-unsupported ramp size 0

Last parameter MUST be an ICC profile containing a vcgt or mLUT tag or empty if the "-a" or "-alter" paramter is used or the LUT is to be cleared. Source: man xcalib — Cyrus, Apr 1 '18 at 18:13

Jeff Schaller · Accepted Answer · 2019-03-16 01:05:57Z

1

use:

xcalib -red 1.1 10.0 100.0 -a

Jeff Schaller♦

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answered Mar 16 '19 at 0:31

Rubenz

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What does the -a mean? Please do not respond in comments; edit your answer to make it clearer and more complete. – G-Man Says 'Reinstate Monica' Mar 16 '19 at 2:13

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