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.ro...@gmail.com> --- man/xrandr.man | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/man/xrandr.man b/man/xrandr.man index aa82724..1291bad 100644 --- a/man/xrandr.man +++ b/man/xrandr.man @@ -257,14 +257,25 @@ 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 value reported as physical size of the X screen as a whole +(union of all configured monitors). In configurations with multiple +monitors with different DPIs, the value has no physical meaning, but +it may be used by some legacy clients which do not support RandR +version 1.2 to compute a reference font scaling. Normally, xrandr resets the reported physical size values to keep the DPI constant. -This overrides that computation. +This overrides that computation. Default DPI value is 96. .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 value reported as physical size of the X screen as a whole +(union of all configured monitors). In configurations with multiple +monitors with different DPIs, the value has no physical meaning, but +it may be used by some legacy clients which do not support RandR +version 1.2 to compute a reference font scaling. 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. Typical values are +the default (96 DPI), the DPI of the only monitor in single-monitor +configurations, or the DPI of the primary monitor in multi-monitor +configurations. .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 -- 2.11.0 _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: https://lists.x.org/mailman/listinfo/xorg-devel
