[ltp] A20p (r128 mobility 3M) XF86 4.1 S/Video -> SCART TV success

Tue, 4 Feb 2003 11:52:46 +0000 (GMT)

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Ok, here are the instructions I slapped together before:
The patch is against debianised xfree86 4.1, but _should_ apply to
vanilla 4.1 or 4.2 - if not, send me your r128_driver.c and I'll
run up a new patch for you.

Incidentally - it could be argued that the BIOS is as much to blame as the
driver: It contains many modelines, but only one dot clock.

Theproblem with the driver is that it _silently_ throws your modes
away. The patched version tells you which modes are being rejected,
and lists all the modes it knows about.

############################################################################

The file you want to patch is

  xc/programs/Xserver/hw/xfree86/drivers/ati/r128_driver.c

( The patch is against a debianised r128_driver.c but it seems to apply
  cleanly to a non-debianised r128_driver.c : no conflicts here )

The only file you need to replace after rebuilding is r128_drv.o, which
should live somewhere like:

  /usr/X11R6/lib/modules/drivers/

Once you have the new r128_drv.o running (restart X completely - depending
on your settings, you may have to restart xdm or gdm or whatever, as they
may not restart X when you log out - they don't by default).

You MUST be in a sufficiently low res mode, or the TV will just sit there.
720x576 works for me.

Next you need atitvout:

   http://www.stud.uni-hamburg.de/users/lennart/projects/atitvout/
   (I just used the debian package)

Now:

   sudo atitvout -f t

kicks the S/Video output to the tv into life ( I used an S/Video ->
SCART cable )

   sudo atitvout -f l

kicks the display back to LCD. The laptop is capable of simultaneous
display.

If you change modes, you MUST reissue the atitvout command to get TV
output back, changing modes kills the S/Video output.

If you want your video player app to use the screen properly, get
it to use the Xv or GL extension to get a fullscreen window:

  'xine -V Xv -f -g -p azumanga_daioh.avi' # for example
           ^^^^^^^^
otherwise it won't use the right size display.
( If you're using Xine, set the config level to the highest level of
  expertise and choose all the resize_stream options as well. )

I think that's everything.

#########################################################################
# gory details
#########################################################################

For the record, below are the modelines the card will _actually_ support.
Any other resolution will be bounced by the driver (XF86 4.1), and in fact
the only data used by the driver are the displayed resolution numbers
(eg 1400 and 1050) and (with my patch) the dotclock. Without my patch,
the dotclock you supply is ignored.

NOTE: the first two modes have dc values < 12.5 MHz, and are unusable.
You _might_ be able to get them going by bumping the dc value higher:
I have assumed that the laptop wants everything @ 60 Hz because the
only out-of-the-box mode that worked was 1400x1050, which was at 60Hz.

NOTE: after switching resolutions (xvidtune -next), the display may be
scrambled: hitting the lid-closed-cutout-switch ( or closing and
reopening the lid ) fixes this for me.

The relationship between the modeline numbers is as follows:

 "label@refresh" dc hdisp hsstart hsstop htotal vdisp vsstart vsstop vtotal

 (dc * 1000000) / (htotal * vtotal) = refresh
 hdisp and vdisp _must_ match an entry in the VBIOS, or your mode will be
 rejected.

 Where dc is in MHz, and refresh is in Hz.

CAVEAT: I am not a video driver hacker or anything, I just found a place
in the code where user data was silently discarded, and then an error
returned based on the new (magic) data, without ever telling anyone why.
I _could_ be completely wrong, but it seems to work, and it's not
black magic or rocket surgery or anything.

(--) R128(0): VBIOS mode: "320x350@60" 10.19 320 368 375 464 350 351 354 366
(--) R128(0): VBIOS mode: "320x400@60" 11.58 320 368 375 464 400 401 404 416
(--) R128(0): VBIOS mode: "320x400@60" 15.18 320 368 382 608 400 400 403 416
(--) R128(0): VBIOS mode: "320x480@60" 18.09 320 368 382 608 480 480 483 496
(--) R128(0): VBIOS mode: "400x600@60" 25.43 400 448 462 688 600 600 603 616
(--) R128(0): VBIOS mode: "512x384@60" 19.20 512 560 574 800 384 384 387 400
(--) R128(0): VBIOS mode: "640x350@60" 20.38 640 688 702 928 350 350 353 366
(--) R128(0): VBIOS mode: "640x400@60" 23.16 640 688 702 928 400 400 403 416
(--) R128(0): VBIOS mode: "640x475@60" 27.34 640 688 702 928 475 475 478 491
(--) R128(0): VBIOS mode: "640x480@60" 27.62 640 688 702 928 480 480 483 496
(--) R128(0): VBIOS mode: "720x480@60" 30.00 720 768 782 1008 480 480 483 496
(--) R128(0): VBIOS mode: "720x576@60" 35.80 720 768 782 1008 576 576 579 592
(--) R128(0): VBIOS mode: "800x600@60" 40.21 800 848 862 1088 600 600 603 616
(--) R128(0): VBIOS mode: "848x480@60" 33.81 848 896 910 1136 480 480 483 496
(--) R128(0): VBIOS mode: "1024x768@60" 61.72 1024 1072 1086 1312 768 769 772 784
(--) R128(0): VBIOS mode: "1280x1024@60" 97.84 1280 1328 1342 1568 1024 1025 1028 1040
(--) R128(0): VBIOS mode: "1400x1050@60" 108.00 1400 1448 1462 1688 1050 1050 1053 1066

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