[Nouveau] [Bug 69083] [NV84] using DVI to VGA adapter for CRT and specifying supported "PreferredMode" >EDID preferred mode, screen output is compressed into small fraction of top scan lines

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69083

--- Comment #2 from Felix Miata <mrmazda at earthlink.net> ---
Created attachment 85420
  --> https://bugs.freedesktop.org/attachment.cgi?id=85420&action=edit
verbose xrandr output per comment infra

(In reply to comment #1)
> Are you sure that the display is actually compressed into the top few
> scanlines? e.g. do you see the mouse cursor in there when you move it
> around?

I started working out this problem 3 months ago. I spent mucho hours trying to
separate it from other bugs at the time. It took me more than two days. A small
sample of the 93 saved logs from that time:
http://fm.no-ip.com/Tmp/Linux/Xorg/PrefMode/

As the session begins to open I see the wallpaper colors, which later change as
Konsole and the panel should be painted. But, I can see the tip of the mouse
pointer in it at times.

> Does it show your normal background?

Can't really tell. My *normal* background is usually hidden under a pile of
windows.

> Or is it just garbage that
> happens to not have 0's for the top few scanlines' worth of data?

It's clearly a color pattern based upon the wallpaper and the panel and
Konsole.

> I've never used PreferredMode before. If you remove it, I assume everything
> works fine?

Yup. Without it happily uses the EDID preference instead of mine.

> What happens if you run something like

> xrandr --output DVI-I-1 --mode 1920x1440

> does that fix things for you? Can you supply the output of

> xrandr --verbose

> after X has started? (You can e.g. ssh in and run DISPLAY=:0 xrandr
> --verbose)

Instead of trying to figure out ssh, I made this script:

xrandr --verbose  > xrandrout.txt
echo mark >> xrandrout.txt
xrandr --output DVI-I-1 --mode 1920x1440
echo mark >> xrandrout.txt
xrandr --verbose  >> xrandrout.txt

I closed a working prior session with Konsole open, added back to configfile
the non-working PreferredMode, started new session, and after a short wait for
Konsole to get open I ran the script.

It changed nothing WRT to the bug, display still mostly just black. Good thing
Ctrl-Alt-BS works.

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