>> stty cols 90 rows 28
>>
>> laptop screen:
>> wsconsctl display.type=inteldrm
>> wsconsctl display.width=1360
>> wsconsctl display.width=768
>>
>> 1st lcd display (hdmi-2-vga + active vga-2-dvi = 1280x920):
>> missing 2 lines on the bottom (including the login prompt)
>>
>> 2nd lcd diaplay (dp-2-vga + active vga-2-dvi = 1280x960:
>> all right, screen fully visible
>
> So you have three displays, all with different native resolutions, and likely
> different aspect ratios.
>
> If I understand correctly, you want to drive them all from the same
> framebuffer, so each one shows the same content, (cloned displays).
Yes.
The laptop support 1920x1080 but in text mode boot up in OpeBSD in 1360x768.
The two external Dell displays support a 75hz frequency but at 1024x768 max
size. By 60hz they can arrive to 1920x1080. In graphical mode, in X, no problem.
Same external screens attached to a different ( minipc) origin (ie different by
a different embedded Intel video card): 1920x1080 on both screens without
'active aid'.
> The obvious question is WHY? Is this just an experiment to see what the
> hardware and software is capable of, or does it have a practical use?
I was driven by the need to resolve the pratical prb to fix the console textual
results by the different console tools.
I saw that by the vga-to-dvi active converters I was able to incrise the output
resolution of the dp port (2nd screen) but not of the hdmi port (1st screen) so
I bought an hdmi-to-vga converter to be able to incrise its resolution by a
twin active converter (of the 2nd screen).
Now, I discovered stty and I'm able to mosty have an acceptable console
behavior also in 1024x768, limiting the screen width (the height become 768,
same of the other screens).
I remain expereminting with the hdmi-to-vga converter just bought that in fact
due to the hdmi resolution ratio take me to a strange output resolution
(1280x920) that is also different from the 2nd screen output resolution
(1280x960).
> Also, are these resolutions that you have quoted, (1280 x 920 and 1280 x 960),
> the actual native resolutions of the external displays, or just what they
> report as the signal being received?
I'm happy with the resolution incrise obtained by the active converters if not
I'm not able to login, the login prompt exceed the 2nd screen (who it appears
to have priority over the 1st screen) height.
The resolution ratio of the hdmi port (1.7777) is the same for the laptop flat
screen and the same for the hdmi. This cause, I believe, the different output
resolution between the two external lcd screens.
>> Given the actual configuration how to fix the missing 2 lines on 1st screen ?
>
> The root cause of this issue is likely to be the setting on the actual
> display, (which might not even be adjustable). You are asking it to display
> 1360 x 768 on a panel which is not 1360 x 768, and probably not even congruent
> with 1360 x 768, (I.E. having the same aspect ratio but a different size).
>
> So the panel has to do something to mung the signal you are sending it, and it
> seems that it is just cropping the bottom of the image.
Right, the resolution of my OpenBSD text mode laptop side is not adjustable and
due to the different resolution ratio I get cropped the height of the 1st
external screen.
> If you really want to make this 'work propperly', (whatever that means), there
> are several options.
>
> Here are some of them:
>
> 1. Reduce the number of rows that the terminal recognises using stty.
>
> This will make, for example, vi usable. But sooner or later you'll probably
> run a program that resets the terminal and it will revert to using all of the
> rows.
Exatly nano and man okay but not all tools are consistent. But generally
speaking it is an acceptable solution.. but 1024x768 let me feel sad..
>
> 2. Force a different screen mode from your graphics card that just happens to
> produce an acceptable display on all of the monitors.
>
> The internal display will probably look awful, and you need to fiddle with the
> code to do this as there are controls exposed to the user to do this.
>
The source resolution, the laptop Intel video card resolution, is not
adjustable from the bios as well.
> 3. Modify rasops to only use the centre portion of the display for the actual
> console.
>
> This is fairly simple, (see diff below for an _EXAMPLE_ of how to do it), and
> means that the lines that are 'cut off' on the '1st lcd display' will just be
> blank and have nothing printed to them whilst on the console, (starting X11
> will use the whole display).
>
> With this approach, the actual display mode, (video signal), stays the same.
>
> --- rasops.c
> +++ rasops.c
> @@ -365,6 +365,8 @@
> while ((ri->ri_emuwidth * bpp & 31) != 0)
> ri->ri_emuwidth--;
>
> + ri->ri_emuheight -= 256;
> +
> #if NRASOPS_ROTATION > 0
> if (ri->ri_flg & (RI_ROTATE_CW | RI_ROTATE_CCW)) {
> ri->ri_rows = ri->ri_emuwidth / ri->ri_font->fontwidth;
I'm on Stable and I'm a stupid user so Im not going for a coding solution but I
was asking for a configuration hint or the proper tool, if any.
dan
