o
"cvt-R" for CVT with "reduced blanking", normally OK with LCD or plasma.
o
"cvt" for the CVT compatible with CRT tech we need a longer blanking.
o
"cvt-Rom" is like "cvt-R" but with margins and more around the active part of the
image, to try if "cvt-R" does not work well.
o
"m-cvt" is like "cvt" but with margins more.
interlace
attribute should always be "p".
aspect_ratio
should be one of the following: "16:9", "4:3", "4:10" or "0:0" or blank for auto
/ unknown.
For example: "1024 768 60 cvt-R p 0:0" would select 1024x768 @ 60 Hz for LCD panels with automatic
aspect ratio.
Fixed modes are fully specified by the user using:
<display-custom-video-mode>width height refresh LM RM UM BM HS VS HP VP
interlace aspect_ratio</display-custom-video-mode>
The additional fields are thus:
LM
- Left-margin, number of pixel clocks between the horizontal sync end & the first active
pixel, decimal integer; In VESA standard this is known as the horizontal back porch.
RM
- Right-margin, number of pixel clocks between the last active pixel and the end of the video
line; decimal integer; In VESA standard this is known as the horizontal front porch.
UM
- Upper-margin, number of video lines between the vertical sync end & the first active line;
decimal integer; In VESA standard this is known as the vertical back porch.
BM
- Lower-margin, number of video lines between the last active line and the end of the video
frame; decimal integer; In VESA standard this is known as the vertical front porch.
HS
- Horizontal sync duration in pixel clocks.
VS
- Vertical sync duration in video lines.
HP
- Horizontal sync polarity, either the + or - character (i.e. high or low active, respectively).
VP
- Vertical sync polarity, either the + or - character (i.e. high or low active, respectively).
So, for the standard VGA 640x480, the string is: "640 480 60 48 16 33 10 96 2 -- p 4:3" (note, there is
no space between the + or - characters used for the sync).
For instance, to set up the display to use 480p custom video mode, use:
<display-custom-video-mode>720 480 60 60 16 30 9 62 6 – p 16:9 </display-
custom-video-mode>
Select the aspect ratio of the screen. The HMP can update the rendered content to match the aspect
ratio of the screen, regardless of the signal actually sent to the display. For instance, if you use a
Содержание HMP series
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