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https://github.com/lm-sensors/lm-sensors.git
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Philip Edelbrock
f55a86c7db
git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@461 7894878c-1315-0410-8ee3-d5d059ff63e0
95 lines
3.8 KiB
Plaintext
95 lines
3.8 KiB
Plaintext
Kernel driver `bt869.o'
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======================
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Status: 'Beta' and needs further development and testing
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Supported chips:
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* Brooktree BT869 Video Modulator chips
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Prefix: `bt869'
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Addresses scanned: I2C 0x44 - 0x45 (inclusive)
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Datasheet: Publicly available at the brooktree web site
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(www.brooktree.com)
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Author: Frodo Looijaard <frodol@dds.nl>, Philip Edelbrock
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<phil@netroege.com> and Ralph Metzler <rjkm@thp.uni-koeln.de>
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Main Contact: Philip Edelbrock <phil@netroedge.com>
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Module Parameters
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-----------------
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* force: short array (min = 1, max = 48)
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List of adapter,address pairs to boldly assume to be present
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* force_bt869: short array (min = 1, max = 48)
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List of adapter,address pairs which are unquestionably assumed to contain
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a `bt869' chip
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* ignore: short array (min = 1, max = 48)
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List of adapter,address pairs not to scan
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* ignore_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples not to scan
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* probe: short array (min = 1, max = 48)
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List of adapter,address pairs to scan additionally
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* probe_range: short array (min = 1, max = 48)
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List of adapter,start-addr,end-addr triples to scan additionally
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Description
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-----------
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This driver provides some access to the Brooktree bt869 found on some video
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cards (like the 'Voodoo3 3000'). Typically, the output can be either an
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s-video connection or composite video. Resolutions supported using the
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chip's built in configurations are 640x480 or 800x600. Other possible
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implementations may allow for double resolutions with some decimations
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(e.g., a monitor running at 1280x960 but the TV out getting every other
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pixel for 640x480).
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Driver Features
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---------------
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Stanards: (US) NTSC or PAL (PAL untested)
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Resultions: 640x480 and 800x600
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Depths: 16 bit or 32 (I forgot if 24 bit worked OK, it probably does)
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Colorbars: Switch on the built-in color bar generator. (FYI- using a blue
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filter, you should see only alternating bright stripes of equal brightness.
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Adjust your TV's color and saturation if this isn't the case.)
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In your XF86Config file, you should have these entries for NTSC output:
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ModeLine "640x480NTSC" 28.195793 640 656 658 784 480 520 525 600
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ModeLine "800x600NTSC" 38.769241 800 812 814 880 600 646 649 735
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or for PAL (untested),
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ModeLine "640x480PAL" 29.50 640 675 678 944 480 530 535 625
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ModeLine "800x600PAL" 36.00 800 818 820 960 600 653 655 750
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Also, don't forget to add these modes to the resolutions list in the
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'screen' sections of XF86Config. You can change modes on the fly in X by
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pressing (usually) ctrl-alt-+ or ctrl-alt-(minus) with + and - being the
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keys on your numeric 10-key pad.
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BTW- My monitor doesn't like these entries very much, and as I've read:
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don't run your monitor out of spec or else it will burst into fire. So,
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having the monitor turned on while in any of these modes is at your own
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risk. (I've never heard of a monitor breaking from this, but it seems to
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be fashionable to warn about it.)
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Chip Features
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-------------
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The chip is very flexible and customizable for many standards. Right now
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the driver sticks with the chip's built in NTSC and PAL standards. It also
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does some other wacky stuff like closed-captioning, Macro-vision
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copy-protection, and other things. Check out the datasheet for more info.
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Issues
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------
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The depth register doesn't seem to do much? If you have troubles or
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aren't sure the output is working, turn the color-bars on. If they display
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OK, then the chip is syncing correctly. The next thing to try is the depth
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setting. Lastly, turning off your computer and back on with your TV
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connected but you monitor not, may force the video card to configure and
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use the BT869 as your primary output device (all bets are off once X is
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started). Let me know if you have problems which you can't figure out
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(phil@netroedge.com).
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