On Wed, 27 May 2020, George N. White III wrote:
On Wed, 27 May 2020 at 02:46, Tim via users <users@xxxxxxxxxxxxxxxxxxxxxxx>
wrote:
On Tue, 2020-05-26 at 18:56 -0500, Michael Hennebry wrote:
VESA notices several resolutionns,
including 1024x768 and 800x600 .
I really do not understand why none of them are allowed.
As a general answer, the system checks out what the graphics chipset
can produce, and what the monitor supports, and will only make use of
mutually compatible modes. It doesn't just look at the resolution, it
also looks at the scan rates (or pixel frequencies, for modern screen
types that don't really scan).
Correct. In this case I don't believe it gets the real monitor properties
(OP didn't say what he has).
Acer V198w
From google, its native resolution appears to be 1440x900,
which is what Centos 7 uses.
From the excerpt of the Xorg.0.log I think it chose the only 60 hz refresh
rate mode. I've seen that problem with KVM switches. When the attempt
to get supported modes from the display fails some old VESA table
(for CRT's) was used (the wrong settings could fry an old CRT monitor
so err on the side of caution).
Actually it did find a 1440x900 60 Hz mode.
Didn't use it.
IIRC it claimed that the mode it did use came from a file.
I thought I'd found the right directory,
but I haven't found that mode.
I remember those days.
I only changed video modes with BIOS calls.
The CRT would go thunk.
Not sure what I was doing wrong.
Other programs that changed video modes did not go thunk.
https://www.systutorials.com/configuration-of-linux-kernel-video-mode/
has an incantation (from 2015) to display available video modes.
I'll look into that this afternoon.
--
Michael hennebry@xxxxxxxxxxxxxxxxxxxxx
"Sorry but your password must contain an uppercase letter, a number,
a haiku, a gang sign, a heiroglyph, and the blood of a virgin."
-- someeecards
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