I decided recently to have a go at building an HTPC using the M2NPV-VM from Asus, which offers component out, so long as you don't have a monitor connected to the computer (using TwinView, DVI + TV-out is apparently an option, but I don't have any monitors with DVI).

When I first hooked it up, the results were pretty bad: it came up at 480p, displaying a downgraded 1024x768 screen, and looking horrible: the colors were reversed, I tried both Ubuntu and Knoppmyth, both come up in a sickly purple color after installing and booting from the hard-drive. I've seen one person writing a guide on HDTV in Linux who decided that the component out on their board was RGB instead of YCbCr as a result of that color problem, fortunately I figured out the solution before jumping to that (almost certainly incorrect) conclusion. I was pretty sure that couldn't be the case though, because the loading screen comes up in the correct color, only once X loads does the color change to a hideous purple.

The good news is it's possible to fix that: the key is adding the line:
Option "TVStandard" "HD1080i" #(or if you prefer, "HD720p")
to the Screen section in xorg.conf, once I got that line in place, things got a lot better...the colors are right, and the screen is no longer fuzzy due to displaying a higher resolution compressed down to 480p. There is a noticeable flicker from the interlacing, particularly when there's a horizontal 1-pixel-wide black line on the screen. I'm afraid the colors are a little washed out too, so I'm not sure I'm happy with the quality of the component output on this board, though I'll have to see what it looks like playing TV on it before I'll be sure.

What I haven't been able to do so far is change the screen resolution from 1024x768 to anything else, though...I have no idea what I need to do to xorg.conf to allow that to happen, and all that wasted screen space is frustrating...there's no point using a computer for recording HDTV if I can't watch it in 1920x1080i, like I can using my wonderful Sony DVR (an excellent design, IIRC they were around $500 or $600, which is much cheaper than the HD Tivo, and use free OTA scheduling from a TVGuide broadcast, it's a shame they've stopped making them).

Any help with figuring out how to make higher resolutions available would be greatly appreciated.

I'm also wondering how the amount of RAM used by the on-board video is determined, the option doesn't seem to exist in BIOS like it did in the old days, and I'm not sure where else that would be configured, in case a lack of video ram could be holding back the display size.

That looks like a sweet mobo.
You need to experiment with modelines. Search this forum for help with that. Your X log will show you what modelines are valid for the display (it thinks so, anyway) and which one is currently in effect. Here's the file:
/var/log/XFree86.0.log

Thanks for the reply...as it turns out, I don't have to experiment with modelines, but your suggestion to search for them did help me find the information I did need: how to specify what resolution the screen should be displayed in. Since I haven't seen anyone spreading the news on how to easily configure YCbCr HDTV-out from NVIDIA, I'll give everyone full info...there are three things you need to do in your X config file (after installing and enabling nvidia drivers, which IIRC is done from the start in KnoppMyth):

1. Tell X to ignore the monitor section...to do that, add the following line to your Screen section:
Option "ConnectedMonitor" "TV"
...this line may not be necessary if you don't actually have a monitor connected, though I never had any success until I added it. At any rate, I know you don't have to worry about mode-lines or vertical and horizontal refresh rates when you have this option enabled. If you're using TwinView, you'll presumably have two Screen sections, make sure to put this in the one for your TV, not in the one for your monitor.

2. Next, you need to tell it what resolution to send...to do that put in one of the following lines (once again, they go in the Screen section):
Option "TVStandard" "HD1080p" #if your video card and screen support 1080p (presumably @ 30Hz, since that's the ATSC standard)
Option "TVStandard" "HD1080i" #if you want to use 1080i @ 60Hz
Option "TVStandard" "HD720p" #if you want to use 720p @ 60Hz
...for a full list of format options, see Appendix H of the NVIDIA Linux readme.

3. Tell X what size the display should be...add one of the following lines, once again in your Screen section, together with the previous two:
Option "MetaModes" "1920x1080" #if you're using 1080i or 1080p
Option "MetaModes" "1280x720" #if you're using 720p
...TwinView users will need to specify both their monitor and HDTV-out resolutions under the MetaModes option, unless your monitor is able to clone the resolution you're using on your HDTV.

That's it! No worries about getting the mode-line right.

The one remaining problem that I have with my display is that it doesn't display 100% of either the 1080i or 720p resolution, which means that toolbars on the edge of the screen cannot be read. I did a little research and discovered that the physical resolution of my HDTV is not 1920x1080 as I had thought, hence one of the reasons that it zooms in and cuts off the edges...and presumably also the reason that 1080i flickers so much: this screen never actually draws 1080i as an interlaced pattern, it doesn't have enough pixels to do so, so whenever there's a line that's one pixel wide, that line gets drawn every other frame, which results in a flicker @ 30Hz. So with my screen, I've decided 720p is a much better solution, since it seems less of the screen is cut off at the edges in that mode, and it avoids the flickering.

Is it possible to set up Linux to waste some of the screen space at the edges? It'd be nice to make every part of the computer screen visible, so menus can be read. I tried messing with the MetaModes option, but apparently that doesn't give you carte blanche to specify any whimsical resolution to go inside the physical resolution specified by the TVStandard, it presumably has to match a resolution supported by your video card.

[edit: I'd previously said the MetaModes line should go in the "Device" section, but it goes in the "Screen" section, just like the other two, sorry for any confusion]

Thanks for this info, it helped me alot. I also have the same problem as you are having, about the edges of the picture being off the tv screen. Post here if you get things working better. I will do the same.

Thanks again.

Thanks for taking the time to post the info after you got it!

I hadn't realized that setting the TV standard fixed the mode lines. This may explain why xvidtune won't let me center my screen. Whenever I try to nudge the screen, it complains about an invalid setting.

Anyway the only tools to adjust the size are overscan (from Xconfig or Myth) and to set X and TV to have a different resolutions (from Myth Setup->General->Appearance?). I have set X to have a smaller resolution than TV, and set an X,Y offset so the menus and buttons are visible. I still have some screens which don't quite fit, but for the most part they do. I still have a couple of lines at the bottom of my screen not used, and when watching recordings, have a line or two showing on the sides from the Knoppmyth background image. I have to bump up the overscan a bit more and need to change the Knoppmyth background to black so I don't see the background coming through.

This URL is useful, there was a better one I've seen, but can't track it down at the moment.

http://www.mythtv.org/wiki/index.php/Overscan

Overscan is a big problem with most HDTV sets. I have no idea why the manufacturers set up the sets for as much overscan as they do, but they do. I had my Pioneeer RPTV adjusted (at great cost) to fix my overscan problem, since it really was a problem of the set.

For sets which have digital imagers (like DLP and LCD monitors) why do manufacturers set up their products to overscan by 10% and even more?!? It just doesn't make sense to me.

_________________
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Thanks guys! This information helped me set up my M2NPV-VM with component video last night. I have a 32 inch analog tv. Setting it to 480i and 640x480 (800x600 also works) fixed the inital blue-screen color problems. Also I had to tell it a fairly small fake screen size to keep it from scaling the fonts down to unreadability. But otherwise it was easy and looks good.

By the way, I'm using 64 bit Ubuntu with Myth 0.20. I did some experiments with knoppmyth last week for practice though. KM is much simpler to work with, but I wanted full support for AMD64 and my SATA boot disk.

Another way to fix the fonts (since you are using the nvidia driver) is to set the DPI option: Option "DPI" "100 x 100". I've read elsewhere that 100x100 is what MythTV is designed for so any other DPI could look off (mine certainly did till I added this).

_________________
nMediaPC HT100SA ASUS A8N-VM CSM
AMD 3200+ AMPO DDR 3200 512MB RAM
PVR-150 (1062) WD 320 GB SATA-2 HD
NEC OEM ND-3550A DVD burner
D-Link DWL-G510 PCI wireless adapter
MS wireless optical desktop 1000
R5F27 (+ modified sa3250ch)

I am attempting to get the comp out to work with my HDTV, and I was wondering if you need to change any of the bios settings related to the video out?


Thanks

I did... Had to set it to use TV instead of "Auto" in the BIOS. I don't remember which screen it was. Just look around in the BIOS setup.

Hi, I was considering this motherboard for use as a myth box also. Does anyone know if the onboard sound works in 5.1 with myth?

Thanks in advance!!

Took a little fiddling, but digital sound output works great now. Had to use a special bracket for it though. Link to where I bought it

I'm not sure how well surround sound works using the headphone style jacks. Mine is plugged into a nice A/V receiver so there's no reason for me to try it.

Hi I am running Knoppmyth R5E0 with a frontend (dual core 3ghz pentium) using a nvidia 6600 with dvi and component. I think its running 8756 and I did turn off vsync in nvidia settings. Originally i had connected it to a samsung 19' monitor via dvi. Now I tried to connect to the component dongle and my Toshiba 65h80 tv trying to output 1080i. Following the steps hear I backed up the original xorg and edited the one below. It allowed me to boot but it is really slow and I could get to the mythtv menus but I have alot of overscan. If I try to watch a recording I get black screen.. It appears its running but looking at top I see xorg at 99% and mythfrontend is way high too. I had no issues running with the monitor so I am sure its the xorg settings. I posted my xorg below. I also wanted to say the colors look pretty bad. Very washed out. I do have a Audio Authority transcoder but I was hoping to not have to fiddle with modelines because I cant find one on the internet anywhere. I can go into the service menu of the Tv and adjust overscan but that is a dangerous pursuit.

So below is my xorg file. Is this right? Also where do you put the command to have nvida settings load on startup? Also why is the performance so bad?

Section "Monitor"
Identifier "Monitor0"
Option "DPMS" "true"
Option "UseEdidDpi" "FALSE"
Option "DPI" "100 x 100"
# HorizSync 28.0 - 78.0 # Warning: This may fry very old Monitors
HorizSync 28.0 - 96.0 # Warning: This may fry old Monitors
VertRefresh 50.0 - 75.0 # Very conservative. May flicker.
# VertRefresh 50.0 - 62.0 # Extreme conservative. Will flicker. TFT default.
# Default modes distilled from
# "VESA and Industry Standards and Guide for Computer Display Monitor
# Timing", version 1.0, revision 0.8, adopted September 17, 1998.
# $XFree86: xc/programs/Xserver/hw/xfree86/etc/vesamodes,v 1.4 1999/11/18 16:52:17 tsi Exp $
# 640x350 @ 85Hz (VESA) hsync: 37.9kHz
ModeLine "640x350" 31.5 640 672 736 832 350 382 385 445 +hsync -vsync
# 640x400 @ 85Hz (VESA) hsync: 37.9kHz
ModeLine "640x400" 31.5 640 672 736 832 400 401 404 445 -hsync +vsync
# 720x400 @ 85Hz (VESA) hsync: 37.9kHz
ModeLine "720x400" 35.5 720 756 828 936 400 401 404 446 -hsync +vsync
# 640x480 @ 60Hz (Industry standard) hsync: 31.5kHz
ModeLine "640x480" 25.2 640 656 752 800 480 490 492 525 -hsync -vsync
# 640x480 @ 72Hz (VESA) hsync: 37.9kHz
ModeLine "640x480" 31.5 640 664 704 832 480 489 491 520 -hsync -vsync
# 640x480 @ 75Hz (VESA) hsync: 37.5kHz
ModeLine "640x480" 31.5 640 656 720 840 480 481 484 500 -hsync -vsync
# 640x480 @ 85Hz (VESA) hsync: 43.3kHz
ModeLine "640x480" 36.0 640 696 752 832 480 481 484 509 -hsync -vsync
# 800x600 @ 56Hz (VESA) hsync: 35.2kHz
ModeLine "800x600" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync
# 800x600 @ 60Hz (VESA) hsync: 37.9kHz
ModeLine "800x600" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync
# 800x600 @ 72Hz (VESA) hsync: 48.1kHz
ModeLine "800x600" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync
# 800x600 @ 75Hz (VESA) hsync: 46.9kHz
ModeLine "800x600" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
# 800x600 @ 85Hz (VESA) hsync: 53.7kHz
ModeLine "800x600" 56.3 800 832 896 1048 600 601 604 631 +hsync +vsync
# 1024x768i @ 43Hz (industry standard) hsync: 35.5kHz
ModeLine "1024x768" 44.9 1024 1032 1208 1264 768 768 776 817 +hsync +vsync Interlace
# 1024x768 @ 60Hz (VESA) hsync: 48.4kHz
ModeLine "1024x768" 65.0 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
# 1024x768 @ 70Hz (VESA) hsync: 56.5kHz
ModeLine "1024x768" 75.0 1024 1048 1184 1328 768 771 777 806 -hsync -vsync
# 1024x768 @ 75Hz (VESA) hsync: 60.0kHz
ModeLine "1024x768" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
# 1024x768 @ 85Hz (VESA) hsync: 68.7kHz
ModeLine "1024x768" 94.5 1024 1072 1168 1376 768 769 772 808 +hsync +vsync
# 1152x864 @ 75Hz (VESA) hsync: 67.5kHz
ModeLine "1152x864" 108.0 1152 1216 1344 1600 864 865 868 900 +hsync +vsync
# 1280x960 @ 60Hz (VESA) hsync: 60.0kHz
ModeLine "1280x960" 108.0 1280 1376 1488 1800 960 961 964 1000 +hsync +vsync
# 1280x960 @ 85Hz (VESA) hsync: 85.9kHz
ModeLine "1280x960" 148.5 1280 1344 1504 1728 960 961 964 1011 +hsync +vsync
# 1280x1024 @ 60Hz (VESA) hsync: 64.0kHz
ModeLine "1280x1024" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
# 1280x1024 @ 75Hz (VESA) hsync: 80.0kHz
ModeLine "1280x1024" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
# 1280x1024 @ 85Hz (VESA) hsync: 91.1kHz
# ModeLine "1280x1024" 157.5 1280 1344 1504 1728 1024 1025 1028 1072 +hsync +vsync
Modeline "1280x1024" 157.50 1280 1328 1488 1728 1024 1025 1028 1072 +hsync +vsync
# 1600x1200 @ 60Hz (VESA) hsync: 75.0kHz
ModeLine "1600x1200" 162.0 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
# 1600x1200 @ 65Hz (VESA) hsync: 81.3kHz
ModeLine "1600x1200" 175.5 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
# 1600x1200 @ 70Hz (VESA) hsync: 87.5kHz
ModeLine "1600x1200" 189.0 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
# 1600x1200 @ 75Hz (VESA) hsync: 93.8kHz
ModeLine "1600x1200" 202.5 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
# 1600x1200 @ 85Hz (VESA) hsync: 106.3kHz
ModeLine "1600x1200" 229.5 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync
# 1792x1344 @ 60Hz (VESA) hsync: 83.6kHz
ModeLine "1792x1344" 204.8 1792 1920 2120 2448 1344 1345 1348 1394 -hsync +vsync
# 1792x1344 @ 75Hz (VESA) hsync: 106.3kHz
ModeLine "1792x1344" 261.0 1792 1888 2104 2456 1344 1345 1348 1417 -hsync +vsync
# 1856x1392 @ 60Hz (VESA) hsync: 86.3kHz
ModeLine "1856x1392" 218.3 1856 1952 2176 2528 1392 1393 1396 1439 -hsync +vsync
# 1856x1392 @ 75Hz (VESA) hsync: 112.5kHz
ModeLine "1856x1392" 288.0 1856 1984 2208 2560 1392 1393 1396 1500 -hsync +vsync
# 1856x1392 @ 60Hz (VESA) hsync: 86.3kHz
ModeLine "1856x1392" 218.3 1856 1952 2176 2528 1392 1393 1396 1439 -hsync +vsync
# 1856x1392 @ 75Hz (VESA) hsync: 112.5kHz
ModeLine "1856x1392" 288.0 1856 1984 2208 2560 1392 1393 1396 1500 -hsync +vsync
# 1920x1440 @ 60Hz (VESA) hsync: 90.0kHz
ModeLine "1920x1440" 234.0 1920 2048 2256 2600 1440 1441 1444 1500 -hsync +vsync
# 1920x1440 @ 75Hz (VESA) hsync: 112.5kHz
ModeLine "1920x1440" 297.0 1920 2064 2288 2640 1440 1441 1444 1500 -hsync +vsync
# Additional modelines
ModeLine "1800x1440" 230 1800 1896 2088 2392 1440 1441 1444 1490 +HSync +VSync
ModeLine "1800x1440" 250 1800 1896 2088 2392 1440 1441 1444 1490 +HSync +VSync
# Extended modelines with GTF timings
# 640x480 @ 100.00 Hz (GTF) hsync: 50.90 kHz; pclk: 43.16 MHz
ModeLine "640x480" 43.16 640 680 744 848 480 481 484 509 -HSync +Vsync
# 768x576 @ 60.00 Hz (GTF) hsync: 35.82 kHz; pclk: 34.96 MHz
ModeLine "768x576" 34.96 768 792 872 976 576 577 580 597 -HSync +Vsync
# 768x576 @ 72.00 Hz (GTF) hsync: 43.27 kHz; pclk: 42.93 MHz
ModeLine "768x576" 42.93 768 800 880 992 576 577 580 601 -HSync +Vsync
# 768x576 @ 75.00 Hz (GTF) hsync: 45.15 kHz; pclk: 45.51 MHz
ModeLine "768x576" 45.51 768 808 888 1008 576 577 580 602 -HSync +Vsync
# 768x576 @ 85.00 Hz (GTF) hsync: 51.42 kHz; pclk: 51.84 MHz
ModeLine "768x576" 51.84 768 808 888 1008 576 577 580 605 -HSync +Vsync
# 768x576 @ 100.00 Hz (GTF) hsync: 61.10 kHz; pclk: 62.57 MHz
ModeLine "768x576" 62.57 768 816 896 1024 576 577 580 611 -HSync +Vsync
# 800x600 @ 100.00 Hz (GTF) hsync: 63.60 kHz; pclk: 68.18 MHz
ModeLine "800x600" 68.18 800 848 936 1072 600 601 604 636 -HSync +Vsync
# 1024x768 @ 100.00 Hz (GTF) hsync: 81.40 kHz; pclk: 113.31 MHz
ModeLine "1024x768" 113.31 1024 1096 1208 1392 768 769 772 814 -HSync +Vsync
# 1152x864 @ 60.00 Hz (GTF) hsync: 53.70 kHz; pclk: 81.62 MHz
ModeLine "1152x864" 81.62 1152 1216 1336 1520 864 865 868 895 -HSync +Vsync
# 1152x864 @ 85.00 Hz (GTF) hsync: 77.10 kHz; pclk: 119.65 MHz
ModeLine "1152x864" 119.65 1152 1224 1352 1552 864 865 868 907 -HSync +Vsync
# 1152x864 @ 100.00 Hz (GTF) hsync: 91.50 kHz; pclk: 143.47 MHz
ModeLine "1152x864" 143.47 1152 1232 1360 1568 864 865 868 915 -HSync +Vsync
# 1280x960 @ 72.00 Hz (GTF) hsync: 72.07 kHz; pclk: 124.54 MHz
ModeLine "1280x960" 124.54 1280 1368 1504 1728 960 961 964 1001 -HSync +Vsync
# 1280x960 @ 75.00 Hz (GTF) hsync: 75.15 kHz; pclk: 129.86 MHz
ModeLine "1280x960" 129.86 1280 1368 1504 1728 960 961 964 1002 -HSync +Vsync
# 1280x960 @ 100.00 Hz (GTF) hsync: 101.70 kHz; pclk: 178.99 MHz
ModeLine "1280x960" 178.99 1280 1376 1520 1760 960 961 964 1017 -HSync +Vsync
# 1280x960 @ 72.00 Hz (GTF) hsync: 72.07 kHz; pclk: 124.54 MHz
ModeLine "1280x960" 124.54 1280 1368 1504 1728 960 961 964 1001 -HSync +Vsync
# 1280x960 @ 75.00 Hz (GTF) hsync: 75.15 kHz; pclk: 129.86 MHz
ModeLine "1280x960" 129.86 1280 1368 1504 1728 960 961 964 1002 -HSync +Vsync
# 1280x960 @ 100.00 Hz (GTF) hsync: 101.70 kHz; pclk: 178.99 MHz
ModeLine "1280x960" 178.99 1280 1376 1520 1760 960 961 964 1017 -HSync +Vsync
# 1280x1024 @ 100.00 Hz (GTF) hsync: 108.50 kHz; pclk: 190.96 MHz
ModeLine "1280x1024" 190.96 1280 1376 1520 1760 1024 1025 1028 1085 -HSync +Vsync
# 1400x1050 @ 60.00 Hz (GTF) hsync: 65.22 kHz; pclk: 122.61 MHz
ModeLine "1400x1050" 122.61 1400 1488 1640 1880 1050 1051 1054 1087 -HSync +Vsync
# 1400x1050 @ 72.00 Hz (GTF) hsync: 78.77 kHz; pclk: 149.34 MHz
ModeLine "1400x1050" 149.34 1400 1496 1648 1896 1050 1051 1054 1094 -HSync +Vsync
# 1400x1050 @ 75.00 Hz (GTF) hsync: 82.20 kHz; pclk: 155.85 MHz
ModeLine "1400x1050" 155.85 1400 1496 1648 1896 1050 1051 1054 1096 -HSync +Vsync
# 1400x1050 @ 85.00 Hz (GTF) hsync: 93.76 kHz; pclk: 179.26 MHz
ModeLine "1400x1050" 179.26 1400 1504 1656 1912 1050 1051 1054 1103 -HSync +Vsync
# 1400x1050 @ 100.00 Hz (GTF) hsync: 111.20 kHz; pclk: 214.39 MHz
ModeLine "1400x1050" 214.39 1400 1512 1664 1928 1050 1051 1054 1112 -HSync +Vsync
# 1600x1200 @ 100.00 Hz (GTF) hsync: 127.10 kHz; pclk: 280.64 MHz
ModeLine "1600x1200" 280.64 1600 1728 1904 2208 1200 1201 1204 1271 -HSync +Vsync
# 1920x1200 @ 60.00 Hz (GTF) hsync: 74.52; pclk: 193.16 MHz
Modeline "1920x1200" 193.16 1920 2048 2256 2592 1200 1201 1204 1242 -HSync +HSync
EndSection

Section "Device"
### Available Driver options are:-
# sw_cursor is needed for some ati and radeon cards
#Option "sw_cursor"
#Option "hw_cursor"
#Option "NoAccel"
#Option "ShowCache"
#Option "ShadowFB"
#Option "UseFBDev"
#Option "Rotate"
Identifier "Card0"
# The following line is auto-generated by KNOPPIX mkxf86config
Driver "nvidia"
VendorName "All"
BoardName "All"
# BusID "PCI:1:0:0"
Option "MetaModes" "1920x1080"


EndSection

Section "Screen"
Identifier "Screen0"
Device "Card0"
Monitor "Monitor0"
Option "ConnectedMonitor" "TV"
Option "TVStandard" "HD1080i"
DefaultColorDepth 24
SubSection "Display"
Depth 1
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 4
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 15
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1024x768" "800x600" "640x480"
EndSubSection
SubSection "Display"
Depth 32
Modes "1024x768" "800x600" "640x480"
EndSubSection
EndSubSection
EndSection

Section "DRI"
Mode 0666
EndSection

The SPDIF header on this board is compatible with 50 ohm coax, so you just need to connect the GND and SIGNAL pins to a RCA connector. You can cut up an audio cable and put on a connector for far less than the hard-to-find ASUS bracket. If you need Toslink, then you still need the bracket.

-kdf