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"

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


xcalib -red 1.1 10.0 100.0 -a
  • 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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