xenocara/driver/xf86-video-intel/man/intel.man

.\" shorthand for double quote that works everywhere.
.ds q \N'34'
.TH intel  __drivermansuffix__ __vendorversion__
.SH NAME
intel \- Intel integrated graphics chipsets
.SH SYNOPSIS
.nf
.B "Section \*qDevice\*q"
.BI "  Identifier \*q"  devname \*q
.B  "  Driver \*qintel\*q"
\ \ ...
.B EndSection
.fi
.SH DESCRIPTION
.B intel
is an __xservername__ driver for Intel integrated graphics chipsets.
The driver supports depths 8, 15, 16 and 24.  All visual types are
supported in depth 8.  For the i810/i815 other depths support the
TrueColor and DirectColor visuals.  For the i830M and later, only the
TrueColor visual is supported for depths greater than 8.  The driver
supports hardware accelerated 3D via the Direct Rendering Infrastructure
(DRI), but only in depth 16 for the i810/i815 and depths 16 and 24 for
the 830M and later.
.SH SUPPORTED HARDWARE
.B intel
supports the i810, i810-DC100, i810e, i815, i830M, 845G, 852GM, 855GM,
865G, 915G, 915GM, 945G, 945GM, 965G, 965Q, 946GZ, 965GM, 945GME,
G33, Q33, and Q35 chipsets.

.SH CONFIGURATION DETAILS
Please refer to __xconfigfile__(__filemansuffix__) for general configuration
details.  This section only covers configuration details specific to this
driver.
.PP
The Intel 8xx and 9xx families of integrated graphics chipsets have a unified
memory architecture and uses system memory for video ram.  For the i810 and
i815 family of chipset, operating system support for allocating system
memory for video use is required in order to use this driver.  For the 830M
and later, this is required in order for the driver to use more video ram
than has been pre-allocated at boot time by the BIOS.  This is usually
achieved with an "agpgart" or "agp" kernel driver.  Linux, FreeBSD, OpenBSD,
NetBSD, and Solaris have such kernel drivers available.
.PP
By default, the i810 will use 8 megabytes
of system memory for graphics.  For the 830M and later, the driver will
automatically size its memory allocation according to the features it will
support.  The
.B VideoRam
option, which in the past had been necessary to allow more than some small
amount of memory to be allocated, is now ignored.
.PP
The following driver
.B Options
are supported
.TP
.BI "Option \*qNoAccel\*q \*q" boolean \*q
Disable or enable acceleration.  Default: acceleration is enabled.
.TP
.BI "Option \*qSWCursor\*q \*q" boolean \*q
Disable or enable software cursor.  Default: software cursor is disable
and a hardware cursor is used for configurations where the hardware cursor
is available.
.TP
.BI "Option \*qColorKey\*q \*q" integer \*q
This sets the default pixel value for the YUV video overlay key.
Default: undefined.
.TP
.BI "Option \*qCacheLines\*q \*q" integer \*q
This allows the user to change the amount of graphics memory used for
2D acceleration and video when XAA acceleration is enabled.  Decreasing this
amount leaves more for 3D textures.  Increasing it can improve 2D performance
at the expense of 3D performance.
Default: depends on the resolution, depth, and available video memory.  The
driver attempts to allocate space for at 3 screenfuls of pixmaps plus an
HD-sized XV video.  The default used for a specific configuration can be found
by examining the __xservername__ log file.
.TP
.BI "Option \*qFramebufferCompression\*q \*q" boolean \*q
This option controls whether the framebuffer compression feature is enabled.
If possible, the front buffer will be allocated in a tiled format and compressed
periodically to save memory bandwidth and power.
This option is only available on mobile chipsets.
Default: enabled on supported configurations.
.TP
.BI "Option \*qTiling\*q \*q" boolean \*q
This option controls whether memory buffers are allocated in tiled mode.  In
many cases (especially for complex rendering), tiling can improve performance.
Default: enabled.
.TP
.BI "Option \*qDRI\*q \*q" boolean \*q
Disable or enable DRI support.
Default: DRI is enabled for configurations where it is supported.

.PP
The following driver
.B Options
are supported for the i810 and i815 chipsets:
.TP
.BI "Option \*qDDC\*q \*q" boolean \*q
Disable or enable DDC support.
Default: enabled.
.TP
.BI "Option \*qDac6Bit\*q \*q" boolean \*q
Enable or disable 6-bits per RGB for 8-bit modes.
Default: 8-bits per RGB for 8-bit modes.
.TP
.BI "Option \*qXvMCSurfaces\*q \*q" integer \*q
This option enables XvMC.  The integer parameter specifies the number of
surfaces to use.  Valid values are 6 and 7.
Default: XvMC is disabled.

.PP
The following driver
.B Options
are supported for the 830M and later chipsets:
.TP
.BI "Option \*qVideoKey\*q \*q" integer \*q
This is the same as the
.B \*qColorKey\*q
option described above.  It is provided for compatibility with most
other drivers.
.TP
.BI "Option \*qXVideo\*q \*q" boolean \*q
Disable or enable XVideo support.
Default: XVideo is enabled for configurations where it is supported.
.TP
.BI "Option \*qLegacy3D\*q \*q" boolean \*q
Enable support for the legacy i915_dri.so 3D driver.
This will, among other things, make the 2D driver tell libGL to
load the 3D driver i915_dri.so instead of the newer i915tex_dri.so.
This option is only used for chipsets in the range i830-i945.
Default for i830-i945 series: Enabled.
Default for i810: The option is not used.
Default for i965: The option is always true.
.TP
.BI "Option \*qAperTexSize\*q \*q" integer \*q
Give the size in kiB of the AGP aperture area that is reserved for the
DRM memory manager present in i915 drm from version 1.7.0 and upwards,
and that is used with the 3D driver in Mesa from version 6.5.2 and
upwards. If the size is set too high to make room for pre-allocated
VideoRam, the driver will try to reduce it automatically. If you use only
older Mesa or DRM versions, you may set this value to zero, and
activate the legacy texture pool (see 
.B "Option \*qLegacy3D\*q"
). If you run 3D programs with large texture memory requirements, you might
gain some performance by increasing this value.
Default: 32768.
.TP
.BI "Option \*qPageFlip\*q \*q" boolean \*q
Enable support for page flipping. This should improve 3D performance at the
potential cost of worse performance with mixed 2D/3D. Also note that this gives
no benefit without corresponding support in the Mesa 3D driver and may not give
the full benefit without triple buffering (see
.B "Option \*qTripleBuffer\*q"
).
Default for i810: The option is not used.
Default for i830 and above: Disabled (This option is currently unstable).
.TP
.BI "Option \*qTripleBuffer\*q \*q" boolean \*q
Enable support for triple buffering. This should improve 3D performance at the
potential cost of worse performance with mixed 2D/3D. Also note that this gives
no benefit without corresponding support in the Mesa 3D driver and may not give
any benefit without page flipping either (see
.B "Option \*qPageFlip\*q"
).
Default for i810: The option is not used.
Default for i830 and above: Disabled.
.TP
.BI "Option \*qAccelMethod\*q \*q" string \*q
Choose acceleration architecture, either "XAA" or "EXA".  XAA is the old
XFree86 based acceleration architecture.  EXA is a newer and simpler
acceleration architecture designed to better accelerate the X Render extension.
Default: "EXA".
.TP
.BI "Option \*qModeDebug\*q \*q" boolean \*q
Enable printing of additional debugging information about modesetting to
the server log.
.TP
.BI "Option \*qForceEnablePipeA\*q \*q" boolean \*q
Force the driver to leave pipe A enabled.  May be necessary in configurations
where the BIOS accesses pipe registers during display hotswitch or lid close,
causing a crash.  If you find that your platform needs this option, please file
a bug against xf86-video-intel at http://bugs.freedesktop.org which includes
the output of 'lspci -v' and 'lspci -vn'.
.TP
.BI "Option \*qLVDS24Bit\*q \*q" boolean \*q
Specify 24 bit pixel format (i.e. 8 bits per color) to be used for the
LVDS output.  Some newer LCD panels expect pixels to be formatted and
sent as 8 bits per color channel instead of the more common 6 bits per
color channel.  Set this option to true to enable the newer format.
Note that this concept is entirely different and independent from the
frame buffer color depth - which is still controlled in the usual way
within the X server.  This option instead selects the physical format
/ sequencing of the digital bits sent to the display.  Setting the
frame buffer color depth is really a matter of preference by the user,
while setting the pixel format here is a requirement of the connected
hardware.  Leaving this unset implies the default value of false,
which is almost always going to be right choice.  If your
LVDS-connected display on the other hand is extremely washed out
(e.g. white on a lighter white), trying this option might clear the
problem.
.TP
.BI "Option \*qLVDSFixedMode\*q \*q" boolean \*q
Use a fixed set of timings for the LVDS output, independent of normal
xorg specified timings.  The default value if left unspecified is
true, which is what you want for a normal LVDS-connected LCD type of
panel.  If you are not sure about this, leave it at its default, which
allows the driver to automatically figure out the correct fixed panel
timings.  See further in the section about LVDS fixed timing for more
information.
.TP
.BI "Option \*qXvMC\*q \*q" boolean \*q
Enable XvMC driver. Current support MPEG2 MC on 915/945 and G33 series.
User should provide absolute path to libIntelXvMC.so in XvMCConfig file.
Default: Disabled.

.SH OUTPUT CONFIGURATION
On 830M and better chipsets, the driver supports runtime configuration of
detected outputs.  You can use the
.B xrandr
tool to control outputs on the command line.  Each output listed below may have
one or more properties associated with it (like a binary EDID block if one is
found).  Some outputs have unique properties which are described below.

.SS "VGA"
VGA output port (typically exposed via an HD15 connector).

.SS "LVDS"
Low Voltage Differential Signalling output (typically a laptop LCD panel).  Available properties:

.PP
.B BACKLIGHT
- current backlight level (adjustable)
.TP 2
By adjusting the BACKLIGHT property, the brightness on the LVDS output can be adjusted.  In some cases, this property may be unavailable (for example if your platform uses an external microcontroller to control the backlight).

.PP
.B BACKLIGHT_CONTROL
- method used to control backlight
.TP 2
The driver will attempt to automatically detect the backlight control method for your platform.  If this fails however, you can select another method which may allow you to control your backlight.  Available methods include:
.PP
.B native
.TP 4
Intel chipsets include backlight control registers, which on some platforms may be wired to control the backlight directly.  This method uses those registers.
.PP
.B legacy
.TP 4
The legacy backlight control registers exist in PCI configuration space, and have fewer available backlight levels than the native registers.  However, some platforms are wired this way and so need to use this method.
.PP
.B combo
.TP 4
This method attempts to use the native registers where possible, resorting to the legacy, configuration space registers only to enable the backlight if needed.  On platforms that have both wired this can be a good choice as it allows the fine grained backlight control of the native interface.
.PP
.B kernel
.TP 4
On some system, the kernel may provide a backlight control driver.  In that case, using the kernel interfaces is preferable, as the same driver may respond to hotkey events or external APIs.

.PP
.B PANEL_FITTING
- control LCD panel fitting
.TP 2
By default, the driver will attempt to upscale resolutions smaller than the LCD's native size while preserving the aspect ratio.  Other modes are available however:
.PP
.B center
.TP 4
Simply center the image on-screen, without scaling.
.PP
.B full_aspect
.TP 4
The default mode.  Try to upscale the image to the screen size, while preserving aspect ratio.  May result in letterboxing or pillar-boxing with some resolutions.
.PP
.B full
.TP 4
Upscale the image to the native screen size without regard to aspect ratio.  In this mode, the full screen image may appear distorted in some resolutions.

.SS "TV"
Integrated TV output.  Available properties include:

.PP
.B BOTTOM, RIGHT, TOP, LEFT
- margins
.TP 2
Adjusting these properties allows you to control the placement of your TV output buffer on the screen.

.PP
.B TV_FORMAT
- output standard
.TP 2
This property allows you to control the output standard used on your TV output port.  You can select between NTSC-M, NTSC-443, NTSC-J, PAL-M, PAL-N, and PAL.

.SS "TMDS-1"
First DVI SDVO output

.SS "TMDS-2"
Second DVI SDVO output

.PP
SDVO and DVO TV outputs are not supported by the driver at this time.

.PP
See __xconfigfile__(__filemansuffix__) for information on associating Monitor
sections with these outputs for configuration.  Associating Monitor sections
with each output can be helpful if you need to ignore a specific output, for
example, or statically configure an extended desktop monitor layout.

.SH HARDWARE LVDS FIXED TIMINGS AND SCALING

Following here is a discussion that should shed some light on the
nature and reasoning behind the LVDSFixedMode option.

Unlike a CRT display, an LCD has a "native" resolution corresponding
to the actual pixel geometry.  A graphics controller under all normal
circumstances should always output that resolution (and timings) to
the display.  Anything else and the image might not fill the display,
it might not be centered, or it might have information missing - any
manner of strange effects can happen if an LCD panel is not fed with
the expected resolution and timings.

However there are cases where one might want to run an LCD panel at an
effective resolution other than the native one.  And for this reason,
GPUs which drive LCD panels typically include a hardware scaler to
match the user-configured frame buffer size to the actual size of the
panel.  Thus when one "sets" his/her 1280x1024 panel to only 1024x768,
the GPU happily configures a 1024x768 frame buffer, but it scans the
buffer out in such a way that the image is scaled to 1280x1024 and in
fact sends 1280x1024 to the panel.  This is normally invisible to the
user; when a "fuzzy" LCD image is seen, scaling like this is why this
happens.

In order to make this magic work, this driver logically has to be
configured with two sets of monitor timings - the set specified (or
otherwise determined) as the normal xorg "mode", and the "fixed"
timings that are actually sent to the monitor.  But with xorg, it's
only possible to specify the first user-driven set, and not the second
fixed set.  So how does the driver figure out the correct fixed panel
timings?  Normally it will attempt to detect the fixed timings, and it
uses a number of strategies to figure this out.  First it attempts to
read EDID data from whatever is connected to the LVDS port.  Failing
that, it will check if the LVDS output is already configured (perhaps
previously by the video BIOS) and will adopt those settings if found.
Failing that, it will scan the video BIOS ROM, looking for an embedded
mode table from which it can infer the proper timings.  If even that
fails, then the driver gives up, prints the message "Couldn't detect
panel mode.  Disabling panel" to the X server log, and shuts down the
LVDS output.

Under most circumstances, the detection scheme works.  However there
are cases when it can go awry.  For example, if you have a panel
without EDID support and it isn't integral to the motherboard
(i.e. not a laptop), then odds are the driver is either not going to
find something suitable to use or it is going to find something
flat-out wrong, leaving a messed up display.  Remember that this is
about the fixed timings being discussed here and not the
user-specified timings which can always be set in xorg.conf in the
worst case.  So when this process goes awry there seems to be little
recourse.  This sort of scenario can happen in some embedded
applications.

The LVDSFixedMode option is present to deal with this.  This option
normally enables the above-described detection strategy.  And since it
defaults to true, this is in fact what normally happens.  However if
the detection fails to do the right thing, the LVDSFixedMode option
can instead be set to false, which disables all the magic.  With
LVDSFixedMode set to false, the detection steps are skipped and the
driver proceeds without a specified fixed mode timing.  This then
causes the hardware scaler to be disabled, and the actual timings then
used fall back to those normally configured via the usual xorg
mechanisms.

Having LVDSFixedMode set to false means that whatever is used for the
monitor's mode (e.g. a modeline setting) is precisely what is sent to
the device connected to the LVDS port.  This also means that the user
now has to determine the correct mode to use - but it's really no
different than the work for correctly configuring an old-school CRT
anyway, and the alternative if detection fails will be a useless
display.

In short, leave LVDSFixedMode alone (thus set to true) and normal
fixed mode detection will take place, which in most cases is exactly
what is needed.  Set LVDSFixedMode to false and then the user has full
control over the resolution and timings sent to the LVDS-connected
device, through the usual means in xorg.

.SH "SEE ALSO"
__xservername__(__appmansuffix__), __xconfigfile__(__filemansuffix__), xorgconfig(__appmansuffix__), Xserver(__appmansuffix__), X(__miscmansuffix__)
.SH AUTHORS
Authors include: Keith Whitwell, and also Jonathan Bian, Matthew J Sottek,
Jeff Hartmann, Mark Vojkovich, Alan Hourihane, H. J. Lu.  830M and 845G
support reworked for XFree86 4.3 by David Dawes and Keith Whitwell.  852GM,
855GM, and 865G support added by David Dawes and Keith Whitwell.  915G,
915GM, 945G, 945GM, 965G, 965Q and 946GZ support added by Alan Hourihane and
Keith Whitwell. Lid status support added by Alan Hourihane. Textured video
support for 915G and later chips, RandR 1.2 and hardware modesetting added
by Eric Anholt and Keith Packard. EXA and Render acceleration added by Wang
Zhenyu. TV out support added by Zou Nan Hai and Keith Packard. 965GM, G33,
Q33, and Q35 support added by Wang Zhenyu.