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Re: Set resolution options without xrandr

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Tony Baldwin composed on 2017-02-04 21:55 (UTC-0500):

> In the past, of course I'd have dug up /etc/X11/xorg.conf with vi, and
> edited it, but there is no such file on this system (Jessie).

/etc/X11/xorg.conf became an optional file many releases ago. It usually can be 
created and used to override problems with automagic configuration like you 
appear to be having.

/etc/X11/xorg.conf.d/ can also be used for the same purposes. Anything in 
/etc/X11/xorg.conf.d/ that conflicts with anything in /etc/X11/xorg.conf will 
override to the extent of conflict.

> I've been trying to use xrandr, but I'm clearly missing something that
> the instructions I'm finding on superuser isn't giving me.
> (http://superuser.com/questions/716795/how-to-adjust-the-screen-resolution-in-debian
> )

That particular URI is trying to use a sledge hammer to drive a brad. Only 
rarely are CVT or GTF heroics necessary with modern versions of Xorg and its 
video drivers. I cannot recall ever in the past decade needing CVT or GTF to 
calculate and configure a modeline. Xorg knows how to and does do that 
automatically based on EDID, or if the display has defective EDID, any 
overriding HorizSync and VertRefresh specifications along with PreferredMode 
configured section Monitor in /etc/X11/xorg.conf* for Xorg to calculate them 
automatically.

> The worst thing is that it WAS on the proper resolution, then I had a
> PSU go south, so powered everything (including the monitor) down, while
> I went out to acquire a new PSU, and, upon rebooting after installing

It's entirely possible creating a mode with xrandr could override some sort of 
filesystem corruption that resulted from the powerdown. Have you tried forcing 
fsck on the / filesystem since the power failure was cured?

> said new PSU, my screen res has gone from a beautiful 1680 x1050 to
> 1280x768 of some such crap, and looks awful, in my opinion.
> I didn't do anything to mess with it, so have no idea why it changed.,
> and now the actual default for the monitor ( the 1680 x 1050 ) appears
> unavailable to xrandr

Something must have become corrupted to cause what is happening to you. Jessie 
should automatically use 1680x1050 on a display whose native resolution is 
1680x1050.

I currently have host big31 connected to a native 1680x1050 LCD booted to Jessie 
with no xrandr commands configured and no /etc/X11/xorg.conf* configured to 
affect display output, and its running TDE @1680x1050.

What follows are things you can try that should work, once you've examined 
/var/log/Xorg.0.log to determine:

	A-which driver is in use
	B-which video device is connected to your display

If you cannot determine these on your own by examining Xorg.0.log, post it to 
http://paste.debian.net/ so someone here can. Also post output from 'lspci -nnk 
| grep -A6 VGA', and/or 'inxi -c0 -v6 | head -n20'. Include output of 'cat 
/proc/cmdline' in your reply.

The video driver in use should not be FBDEV(0) or VESA(0). Neither support any 
widescreen modes. What you want to see are lots of lines containing intel(0), 
nouveau(0) or radeon(0), according to which gfxchip you have, or modeset(0) or 
modesetting(0) without regard to which gfxchip you have. Something you can try 
if your gfxchip is neither ancient nor newer than Jessie is forcing use of the 
modesetting driver by ensuring xserver-xorg-video-modesetting is installed, and 
purging the xserver-xorg-video-[ati,intel,nouveau] driver matching your gfxchip.

To configure your display manually:

1-create a script in /etc/X11/Xsession.d/ containing the xrandr command you wish 
applied when X starts. http://fm.no-ip.com/Share/setup contains a long list of 
xrandr commands that have worked for me with various hardware at various times; or

2-create /etc/X11/xorg.conf.
http://fm.no-ip.com/Share/Linux/xorg.conf-1680x1050x108-mini can be used as a 
starting skeleton. Comment or remove the DisplaySize line if you don't wish DPI 
forced to 108. If your gfxcard has multiple outputs, xorg.conf may require an 
uncommented line in the device section similar one of those contained in:
http://fm.no-ip.com/Share/Linux/50-device.conf , e.g.:
	Option	"monitor-VGA-0"	"DefaultMonitor"
You shouldn't need to specify the driver to use, but if 1680x1050 continues to 
fail to result you can try putting one in the device section, e.g.:
	'Driver "nouveau"'.
-- 
"The wise are known for their understanding, and pleasant
words are persuasive." Proverbs 16:21 (New Living Translation)

  Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/

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Thread

Set resolution options without xrandr Tony Baldwin <tonybaldwin@gmx.com> - 2017-02-05 04:00 +0100
  Re: Set resolution options without xrandr John Hasler <jhasler@newsguy.com> - 2017-02-05 05:30 +0100
    Re: Set resolution options without xrandr Ric Moore <wayward4now@gmail.com> - 2017-02-05 06:10 +0100
  Re: Set resolution options without xrandr Felix Miata <mrmazda@earthlink.net> - 2017-02-05 06:00 +0100
    Re: Set resolution options without xrandr Tony Baldwin <tonybaldwin@gmx.com> - 2017-02-05 15:20 +0100
      Magickally Resolved?: Set resolution options without xrandr Tony Baldwin <tonybaldwin@gmx.com> - 2017-02-05 16:00 +0100
        Re: Magickally Resolved?: Set resolution options without xrandr rhkramer@gmail.com - 2017-02-05 16:30 +0100
          Re: Magickally Resolved?: Set resolution options without xrandr Steven Mainor <steve@degga.net> - 2017-02-07 01:50 +0100
        Re: Magickally Resolved?: Set resolution options without xrandr Felix Miata <mrmazda@earthlink.net> - 2017-02-05 18:20 +0100

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