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.TH WESTON-DRM 7 "2012-11-27" "Weston __version__"
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.SH NAME
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weston-drm \- the DRM backend for Weston
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.SH SYNOPSIS
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.B weston-launch
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.LP
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.B weston --backend=drm-backend.so
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.
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.\" ***************************************************************
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.SH DESCRIPTION
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The DRM backend is the native Weston backend for systems that support
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the Linux kernel DRM, kernel mode setting (KMS), and evdev input devices.
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It is the recommended backend for desktop PCs, and aims to provide
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the full Wayland experience with the "every frame is perfect" concept.
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It also relies on the Mesa GBM interface.
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With the DRM backend,
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.B weston
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runs without any underlying windowing system. The backend uses the
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Linux KMS API to detect connected monitors. Monitor hot-plugging is
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supported. Input devices are found automatically by
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.BR udev (7).
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Compositing happens mainly in GL\ ES\ 2, initialized through EGL. It
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is also possible to take advantage of hardware cursors and overlays,
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when they exist and are functional. Full-screen surfaces will be
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scanned out directly without compositing, when possible.
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Hardware accelerated clients are supported via EGL.
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The backend chooses the DRM graphics device first based on seat id.
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If seat identifiers are not set, it looks for the graphics device
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that was used in boot. If that is not found, it finally chooses
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the first DRM device returned by
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.BR udev (7).
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Combining multiple graphics devices are not supported yet.
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The DRM backend relies on
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.B weston-launch
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for managing input device access and DRM master status, so that
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.B weston
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can be run without root privileges. On switching away from the
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virtual terminal (VT) hosting Weston, all input devices are closed and
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the DRM master capability is dropped, so that other servers,
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including
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.BR Xorg (1),
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can run on other VTs. On switching back to Weston's VT, input devices
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and DRM master are re-acquired through the parent process
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.BR weston-launch .
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.
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.\" ***************************************************************
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.SH CONFIGURATION
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.
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The DRM backend uses the following entries from
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.BR weston.ini .
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.SS Section output
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.TP
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\fBname\fR=\fIconnector\fR
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The KMS connector name identifying the output, for instance
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.IR LVDS1 .
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.TP
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\fBmode\fR=\fImode\fR
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Specify the video mode for the output. The argument
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.I mode
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can be one of the words
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.BR off " to turn the output off, "
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.BR preferred " to use the monitor's preferred video mode, or "
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.BR current " to use the current video mode and avoid a mode switch."
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It can also be a resolution as
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\fIwidth\fBx\fIheight\fR, or a detailed mode line as below.
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.TP
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\fBmode\fR=\fIdotclock hdisp hsyncstart hsyncend htotal \
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vdisp vsyncstart vsyncend vtotal hflag vflag\fR
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Use the given detailed mode line as the video mode for this output.
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The definition is the same as in
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.BR xorg.conf "(5), and " cvt (1)
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can generate detailed mode lines.
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.TP
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\fBtransform\fR=\fItransform\fR
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Transform for the output, which can be rotated in 90-degree steps
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and possibly flipped. Possible values are
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.BR normal ", " 90 ", " 180 ", " 270 ", "
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.BR flipped ", " flipped-90 ", " flipped-180 ", and " flipped-270 .
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.
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.\" ***************************************************************
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.SH OPTIONS
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.
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When the DRM backend is loaded,
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.B weston
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will understand the following additional command line options.
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.TP
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.B \-\-current\-mode
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By default, use the current video mode of all outputs, instead of
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switching to the monitor preferred mode.
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.TP
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\fB\-\-drm\-device\fR=\fIcardN\fR
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Use the DRM device
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.I cardN
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instead of the default heuristics based on seat assignments and boot VGA
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status. For example, use
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.BR card0 .
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.TP
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\fB\-\-seat\fR=\fIseatid\fR
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Use graphics and input devices designated for seat
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.I seatid
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instead of the default seat
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.BR seat0 .
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.TP
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\fB\-\-tty\fR=\fIx\fR
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Launch Weston on tty
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.I x
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instead of using the current tty.
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.
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.\" ***************************************************************
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.SH ENVIRONMENT
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.
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.TP
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.B WESTON_TTY_FD
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The file descriptor (integer) of the opened tty where
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.B weston
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will run. Set by
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.BR weston-launch .
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.TP
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.B WESTON_LAUNCHER_SOCK
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The file descriptor (integer) where
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.B weston-launch
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is listening. Automatically set by
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.BR weston-launch .
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.
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.\" ***************************************************************
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.SH "SEE ALSO"
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.BR weston (1)
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.\".BR weston-launch (1),
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.\".BR weston.ini (5)
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