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