I just installed RedHat Linux 9.0 on my home computer. This one''s monitor is such as that even brightness and contrast at 100%, I can hardly see anything that''s below %50 white. In Windows I use Adobe Gamma to correct this, and manages to get it fairly "normal". Now, I don''t know how to go about doing this feat in RH Linux (using Gnome, btw). I tried googling some, but fail to find any straight forward anwers. In addition to the gamma thing, I have another question: How do I change the monitor''s refresh frequency? When using 1024x800 @ 85Hz, the actual view area is about 1-2 inch smaller than at 75 Hz. Even though I am pretty familiar with *nix, most of my knowledge and understanding is theoretical rather than practical. Due to my lack of quantity experience with *nix systems, I tend to find myself lost in some areas, so please be detailed in any answers you give. Thanks for listening.

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I don''t know if there''s a GUI tool for gamma in Red Hat. If you can''t find anything, open a terminal and type "xgamma -h" (that will give you instructions on what to pass to xgamma).

About Frequency: Red Hat 9.0 uses the new XFree 4.3 which has a really nice way of doing this. I don''t rememeber what it''s called, but there will be a program in the menu to change the screen resolution as well as frequency. It''ll allow you to pick from a list.

Thanks.

I did find a setting, in (sorry if terms aren''t right, I let it use swedish language when I installed) "System configuration"->"Display"->"Advanced"->"Display". There I could select my monitor''s model and it''s parameters, "refresh rate" among others. But, as the current value was "50-110 Hz" I assumed that it was the supported range, not the frequency to use. I entered 75, restarted X, and it worked.

xgamma (-gamma 2.5) did the trick. However, it was lost when X was restarted. Do you have any suggestion where I can change it permanently?

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Original post by CWizard
xgamma (-gamma 2.5) did the trick. However, it was lost when X was restarted. Do you have any suggestion where I can change it permanently?

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To do it by hand, add "Gamma value" to a line in the Monitor section of your XF86Config-4 file (found in /etc/X11). Like I said, I have no idea if Red Hat has a GUI configuration tool for this, so that (by hand) may be the only way.

or put it in your ~/.xinitrc

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Original post by Null and Void
To do it by hand, add "Gamma value " to a line in the Monitor section of your XF86Config-4 file (found in /etc/X11).

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Yeah, that worked. Thanks again.

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I tried it by using "xgamma", but it has no effect. Is it possible that it doesnt works with vesa?

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Original post by klausewitz
I tried it by using "xgamma", but it has no effect. Is it possible that it doesnt works with vesa?

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It wouldn''t surprise me to hear it doesn''t work when running through the vesa driver.