Xorg framebuffer and brightness of screen

Ken Moffat zarniwhoop at ntlworld.com
Thu Nov 11 21:56:06 UTC 2021

On Thu, Nov 11, 2021 at 10:16:18AM +0300, Riza Dindir wrote:
> Hello Ken
> I am using gop, and a framebuffer. When i try to use the xrandr, it says
> "gamma is set to 0", or "failed to get size of gamma for output default".
> I can set the gamma uaing xgamma and in the xorg.conf file.
> Riza
No idea what gop is - google suggests it's the american republican
party ;-)

Did you search for that "failed to get" message ?  Google gives me a lot of
different matches, some for failing to correctly add a new mode,
others for running with nvidia drivers or in virtualbox, or with out
of date manufacturer's video driver.

For an ubuntu-based kernel with at-the-time recent intel graphics
hardware, adding a boot arg to enable alpha-quality intel support.

In short, finding the answer really does seem to depend on what
hardware and distro are in use.  I'm assuming you're using some sort
of linux.

Vetinari smiled. "Can you keep a secret, Mister Lipwig?"
"Oh, yes, sir. I've kept lots."
"Capital. And the point is, so can I. You do not need to know.”

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