Resolution on SCFB X11 Driver

[alphachi]

https://forums.freebsd.org/threads/55222/

2016-06-25 3:16 GMT+08:00 Polytropon <freebsd at edvax.de>:

> On Fri, 24 Jun 2016 13:24:17 -0400, Charles W. Ross wrote:
> > Hi all,
> >
> > I'm running FreeBSD 10.3 on an Intel NUC with 4th generation graphics.
> > This is not supported by the i915 driver yet, so I'm using the SCFB
> > (frame buffer) driver.
> >
> > It works, but I can't seem to set an optimal resolution. My display (24"
> > Dell) supports 1920*1200, but the system only permits X11 to operate at
> > 1280*1024.
> >
> > I have tried the usual settings in xorg.conf to define the display's
> > "Modes" at 1920*1200, but no luck. Running 'xrandr' presents only one
> > option: 1280*1024.
> >
> > I know the SCFB driver is capable of operating at higher resolutions,
> > does anyone have any tips on how to set this?
>
> Some years ago, I had a similar problem with the nvidia driver
> not providing a screen size biiger than 1024x768 (which isn't
> that great on an 21" 4:3 CRT), so I tested and collected some
> tweaks for xorg.conf. Maybe those are driver-specific or even
> outdated, but maybe they can be an inspiration for further
> investigations.
>
> I did manually define the monitor's physical parameters to
> allow X to calculate the required resolution and size:
>
> Section "Monitor"
>         Identifier      "Monitor0"
>         VendorName      "Eizo"
>         ModelName       "FlexScan F980"
>         HorizSync       30.0 - 137.0
>         VertRefresh     50.0 - 160.0
>         Option          "DPMS"                  "false"
>         DisplaySize     410 305
>         # X*Y in mm for DPI calculation, cf. xinit -- -dpi 72/75/96/115
> EndSection
>
> In that section, if I set
>
>         Option       "PreferredMode" "1920x1200"
>
> the system locked up. No idea why.
>
> Later on, I tried to set the DPI size and disable EDID information
> retrieval:
>
> Section "Device"
>         Identifier      "Card0"
>         Driver          "nvidia"
>         [...]
>         Option          "UseEdid"               "FALSE"
>         Option          "UseEdidDpi"            "FALSE"
>         Option          "DPI"                   "96 x 96"
> EndSection
>
> In the "most important section" of xorg.conf, I could successfully
> set the screen sizes to switch manually (with Ctrl+Alt+[+]/[-] keys)
> or via program (for example games that activated a full screen mode
> that was not the "usual" mode).
>
> Section "Screen"
>         Identifier      "Screen0"
>         Device          "Card0"
>         Monitor         "Monitor0"
>         DefaultDepth    24
>         SubSection "Display"
>                 Viewport        0 0
>                 Depth           24
>                 Visual          "TrueColor"
>                 Modes           "1400x1050" "1152x864" "1024x768"
> "800x600" "640x480" "320x240"
>         EndSubSection
> EndSection
>
> In case of a flat panel, all size settings should be the same, and
> in the "Screen" section, there should be only one entry of the
> desired format.
>
> I always could manually switch to the desired mode:
>
>         xrandr --fb 1400x1050
>         xrandr --size 1400x1050
>
> which I had temporarily put into ~/.xinitrc, but that looked wrong.
>
> With "xrandr" without parameter) you should then get a list of the
> available modes, with the one selected at the top.
>
>
>
> --
> Polytropon
> Magdeburg, Germany
> Happy FreeBSD user since 4.0
> Andra moi ennepe, Mousa, ...
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