Resolution on SCFB X11 Driver
Polytropon
freebsd at edvax.de
Fri Jun 24 19:16:40 UTC 2016
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outdated, but maybe they can be an inspiration for further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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