[PATCH v2 app/xrandr] Document that --dpi and --fbmm options set DPI of whole X screen

[Pali Rohár]

walter, any other objections? I fixed problematic parts which you pointed.

On Monday 24 July 2017 20:34:39 Pali Rohár wrote:
> Explicitly document and make it clear that those options do not change
> DPI of some monitor output. Also state that these options have no useful
> meaning for multi-monitor configuration.
> 
> Signed-off-by: Pali Rohár <pali.rohar at gmail.com>
> ---
>  man/xrandr.man |   14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/man/xrandr.man b/man/xrandr.man
> index 65ccc2a..a5476d4 100644
> --- a/man/xrandr.man
> +++ b/man/xrandr.man
> @@ -232,14 +232,20 @@ fit within this size. When this option is not provided, xrandr computes the
>  smallest screen size that will hold the set of configured outputs; this
>  option provides a way to override that behaviour.
>  .IP "\-\-fbmm \fIwidth\fPx\fIheight\fP"
> -Sets the reported values for the physical size of the screen. Normally,
> +Sets the reported values for the physical size of the whole X screen (not particular
> +output!) which consists of all configured monitors. Physical size of the X screen does
> +not have any meaning when monitors with different DPI are configured. Normally,
>  xrandr resets the reported physical size values to keep the DPI constant.
> -This overrides that computation.
> +This overrides that computation. This option should be calculated from DPI
> +value 96 as it not have any useful meaning for multi-monitor configuration.
>  .IP "\-\-dpi \fIdpi\fP"
>  .IP "\-\-dpi \fIfrom-output\fP"
> -This also sets the reported physical size values of the screen, it uses either
> +This also sets the reported physical size values of the whole X screen (not particular
> +output!) which consists of all configured monitors. Physical size of the X screen does not
> +have any meaning when monitors with different DPI are configured. This option uses either
>  the specified DPI value, or the DPI of the given output, to compute an appropriate
> -physical size using whatever pixel size will be set.
> +physical size using whatever pixel size will be set (default 96 DPI). It does not
> +have any useful meaning for multi-monitor configuration.
>  .IP "\-\-newmode \fIname\fP \fImode\fP"
>  New modelines can be added to the server and then associated with outputs.
>  This option does the former. The \fImode\fP is specified using the ModeLine

-- 
Pali Rohár
pali.rohar at gmail.com