Re: How to know if DVI connection is digital or analogue?
On Tue, Mar 09, 2010 at 09:22:24AM +0200, Dotan Cohen wrote: As you can see from the pictures, the pinout variations¹ allow different subsets of the pins to be used. Typically the female end on your graphics card will be DVI-I and support all options, while the cable from the display will have just the subset of the pins it needs. For example, if you connect a digital monitor to a DVI-I port it *can't* Here I assume you meant DVI-D, not DVI-I? I mean DVI-D cable to DVI-I socket (this will ensure the signal is digital). On my monitors and computers, all sockets are always DVI-I and all cables are DVI-D. You can verify this on your monitor checking if it has the four analogue connectors and the same on the cable. If it doesn't, then it can only physically recieve digital input; problem solved! The only other choices cable-wise are DVI-I which can carry both signals, and this should result in autoselection of the correct output (which should be digital) and DVI-A (which you don't need to care about). If you have a DVI-I cable, then it might select analogue for some bizarre reason. Swapping for a DVI-D cable would resolve that if you can't work out how to do it in software. Regards, Roger -- .''`. Roger Leigh : :' : Debian GNU/Linux http://people.debian.org/~rleigh/ `. `' Printing on GNU/Linux? http://gutenprint.sourceforge.net/ `-GPG Public Key: 0x25BFB848 Please GPG sign your mail. signature.asc Description: Digital signature
Re: How to know if DVI connection is digital or analogue?
I mean DVI-D cable to DVI-I socket (this will ensure the signal is digital). On my monitors and computers, all sockets are always DVI-I and all cables are DVI-D. You can verify this on your monitor checking if it has the four analogue connectors and the same on the cable. If it doesn't, then it can only physically recieve digital input; problem solved! I missed the word port in your original comment. I see. The only other choices cable-wise are DVI-I which can carry both signals, and this should result in autoselection of the correct output (which should be digital) and DVI-A (which you don't need to care about). If you have a DVI-I cable, then it might select analogue for some bizarre reason. Swapping for a DVI-D cable would resolve that if you can't work out how to do it in software. Yes, he has DVI-I ports on the monitor and on the motherboard, and a DVI-I cable that came with the monitor. Maybe it's time to take a pair of needle-nosed pliers to that cable! -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003090333n60615ba7h358cdd83428d5...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Tue, 09 Mar 2010 13:33:44 +0200, Dotan Cohen wrote: (it seems none of my previous posts have arrived to the list. Gmane has been offline... again) The only other choices cable-wise are DVI-I which can carry both signals, and this should result in autoselection of the correct output (which should be digital) and DVI-A (which you don't need to care about). ��If you have a DVI-I cable, then it might select analogue for some bizarre reason. ��Swapping for a DVI-D cable would resolve that if you can't work out how to do it in software. Yes, he has DVI-I ports on the monitor and on the motherboard, and a DVI-I cable that came with the monitor. Maybe it's time to take a pair of needle-nosed pliers to that cable! Or better yet, you can tell the user to get a DVI-D to DVI-D cable, as I suggested in my /very first/ post :-) Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.09.14.42...@gmail.com
Re: How to know if DVI connection is digital or analogue?
On Tue, 09 Mar 2010 13:33:44 +0200, Dotan Cohen wrote: (none of my previous posts seem to have arrived to the list. Gmane has been... again) The only other choices cable-wise are DVI-I which can carry both signals, and this should result in autoselection of the correct output (which should be digital) and DVI-A (which you don't need to care about). If you have a DVI-I cable, then it might select analogue for some bizarre reason. Swapping for a DVI-D cable would resolve that if you can't work out how to do it in software. Yes, he has DVI-I ports on the monitor and on the motherboard, and a DVI-I cable that came with the monitor. Maybe it's time to take a pair of needle-nosed pliers to that cable! Or better yet, using a DVI-D to DVI-D cable, that was *exactly* what I suggested in my /very firt/ reply :-) Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.09.14.15...@gmail.com
Re: How to know if DVI connection is digital or analogue?
On Tue, 09 Mar 2010 09:31:53 +, Roger Leigh wrote: (...) The only other choices cable-wise are DVI-I which can carry both signals, and this should result in autoselection of the correct output (which should be digital) and DVI-A (which you don't need to care about). If you have a DVI-I cable, then it might select analogue for some bizarre reason. Swapping for a DVI-D cable would resolve that if you can't work out how to do it in software. I agree. In fact, that (using a DVI-D to DVI-D cable) was the first suggestion I made to Dotan but was quickly rejected :-) Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.09.12.46...@gmail.com
Re: How to know if DVI connection is digital or analogue?
On Mon, 08 Mar 2010 22:48:28 +0200, Dotan Cohen wrote: On 8 March 2010 16:16, Camaleón wrote: He is using the cable that came with the monitor. Can't he get a new one? Or at least, can't he determine what type of cable is it? DVI-I, DVI-D... I find that a hardware solution is the most appropiate (an easiest) method to be sure :-? Why get a new cable? His current cable works fine. Because is a cheap and easy way to assure the connection goes fully digital. He just wants to know whether the video is analogue or digital, because in Windows on the same hardware he had to especially configure it to send digital. Never heard from that situation. VGA and DVI outputs are very well separated in both, graphic cards and displays :-? Anyway, what tool is he using to achieve that (forcing windows going digital) and what tool is being used to discern the signal type? That will be quite interesting :-) Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.08.23.17...@gmail.com
Re: How to know if DVI connection is digital or analogue?
Or better yet, you can tell the user to get a DVI-D to DVI-D cable, as I suggested in my /very first/ post :-) He does not want to invest in any new hardware. I personally also don't think that a hardware solution is the correct solution. In a general sense, it would be good to know how to force digital. -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003091103r2d2a88c9k77bddcd678c4c...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
Why get a new cable? His current cable works fine. Because is a cheap and easy way to assure the connection goes fully digital. A software solution would be cheaper, and is in my own opinion the fix, not a workaround like a new cable is. He just wants to know whether the video is analogue or digital, because in Windows on the same hardware he had to especially configure it to send digital. Never heard from that situation. VGA and DVI outputs are very well separated in both, graphic cards and displays :-? No, it was analogue output over the DVI-I cable. Apparently it defaults to analogue, and one has to install a driver to get digital. Anyway, what tool is he using to achieve that (forcing windows going digital) and what tool is being used to discern the signal type? That will be quite interesting :-) I suppose that it was the driver software, I'm not sure. I sent him a text message a few minutes ago to ask but he's not writing back. On windows most drivers have a userspace application too, that sits in the system tray and gives the user one more thing to get frustrated at :) -- Dotan Cohen http://bido.com http://what-is-what.com -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003091122k3a3c690ej65e138f276eb4...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Tue, 09 Mar 2010 21:03:18 +0200, Dotan Cohen wrote: Or better yet, you can tell the user to get a DVI-D to DVI-D cable, as I suggested in my /very first/ post :-) He does not want to invest in any new hardware. I personally also don't think that a hardware solution is the correct solution. In a general sense, it would be good to know how to force digital. I'd say he's facing a very strange and uncommon situation. I've never seen that before, as I told you. And from the other user's comments I think neither they have. In such case, I would find a very good invest the 25$ it costs a DVI-D cable ;-) In fact, hardware solutions tend to be better (more reliable) than any software solution and usually are easy to diagnose. And you know, Windows (and some manufacturers) does not always make fair play :-) Remember Occam's razor statement: the simplest solution is usually the correct one. Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.09.19.33...@gmail.com
Re: How to know if DVI connection is digital or analogue?
I'd say he's facing a very strange and uncommon situation. I've never seen that before, as I told you. And from the other user's comments I think neither they have. The thing is, I wonder just how uncommon it is! Would thinks of these things? It would not surprise me to learn that 90% of Windows DVI connections are analogue and the user does not know. In such case, I would find a very good invest the 25$ it costs a DVI-D cable ;-) In fact, hardware solutions tend to be better (more reliable) than any software solution and usually are easy to diagnose. And you know, Windows (and some manufacturers) does not always make fair play :-) Remember Occam's razor statement: the simplest solution is usually the correct one. If this were a mission critical situation, I would agree. -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003091206v3b920d9cp1f1b825289bd2...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Tue, 09 Mar 2010 22:06:09 +0200, Dotan Cohen wrote: I'd say he's facing a very strange and uncommon situation. I've never seen that before, as I told you. And from the other user's comments I think neither they have. The thing is, I wonder just how uncommon it is! Would thinks of these things? It would not surprise me to learn that 90% of Windows DVI connections are analogue and the user does not know. Some steps to prevent that situation require the user: 1/ Buy a dual DVI-D card (no VGA output, no chance to mess) 2/ Use a DVD-D to DVD-D cable (no VGA pins, no chance either) That should be bulletproof to ensure a digital link :-) Anyway, the question still remains. How can we test -here in Debian- if we are getting a digital or analog signal, regardless the source and/or the cable being used? Remember Occam's razor statement: the simplest solution is usually the correct one. If this were a mission critical situation, I would agree. Small things can grow without warning. We must care any of them. Entropy is out there... Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.09.20.24...@gmail.com
Re: How to know if DVI connection is digital or analogue?
Dotan Cohen wrote: I'd say he's facing a very strange and uncommon situation. I've never seen that before, as I told you. And from the other user's comments I think neither they have. The thing is, I wonder just how uncommon it is! Would thinks of these things? It would not surprise me to learn that 90% of Windows DVI connections are analogue and the user does not know. In such case, I would find a very good invest the 25$ it costs a DVI-D cable ;-) In fact, hardware solutions tend to be better (more reliable) than any software solution and usually are easy to diagnose. And you know, Windows (and some manufacturers) does not always make fair play :-) Remember Occam's razor statement: the simplest solution is usually the correct one. If this were a mission critical situation, I would agree. It probably doesn't matter at this point but my two cents: The DVI monitors I have here, they all indicate whether they're receiving digital or analog when they're powered on or when the signal cable gains signal. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4b96b1f9.4040...@sdf.lonestar.org
Re: How to know if DVI connection is digital or analogue?
It probably doesn't matter at this point but my two cents: The DVI monitors I have here, they all indicate whether they're receiving digital or analog when they're powered on or when the signal cable gains signal. Thanks, that is useful to know. -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003092310g669a4a2bu34b8015bd851a...@mail.gmail.com
How to know if DVI connection is digital or analogue?
DVI supports both digital and analgue connections (that's how VGA adaptors work). I have a user who fought with his Windows drivers to force digital connection, even though he was connecting with the DVI ports over a DVI cable it was sending analogue until he configured it properly. Not that he is running a Debian derivative, how can he check which connection (digital or analogue) is being used? Notice that he can't actually _see_ and difference on the screen :) But it is important to him to know that it is in fact digital. -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003080259i12b8f891od6ebc7980494c...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Mon, 08 Mar 2010 12:59:13 +0200, Dotan Cohen wrote: DVI supports both digital and analgue connections (that's how VGA adaptors work). That's DVI-I, I guess. I have a user who fought with his Windows drivers to force digital connection, even though he was connecting with the DVI ports over a DVI cable it was sending analogue until he configured it properly. Not that he is running a Debian derivative, how can he check which connection (digital or analogue) is being used? Tell the user to use a DVI-D to DVI-D (only digital) cable :-) Notice that he can't actually _see_ and difference on the screen :) But it is important to him to know that it is in fact digital. Visual difference can arise, but I think it depends on displays and graphic cards brand/model/quality. Using VGA signal, usually the text renders a bit more fuzzy that using a digital link (cristal clear strokes). Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.08.12.54...@gmail.com
Re: How to know if DVI connection is digital or analogue?
Tell the user to use a DVI-D to DVI-D (only digital) cable :-) He is using the cable that came with the monitor. Is there no way to tell which type of connection is being used? For whatever reason, it is important to him to know that the connection is digital. -- Dotan Cohen http://bido.com http://what-is-what.com -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003080547m118d58ah1092bea57af10...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Seg, 08 Mar 2010, Dotan Cohen wrote: Is there no way to tell which type of connection is being used? For whatever reason, it is important to him to know that the connection is digital. I might be saying complete bullshit, but do DVI cables carry tha analog signal? It's true the connectors in VGA boards have both signals, but shouldn't a standard DVI cable only transmit the digital signal and ignore the analog part, which is used only when a DVI-VGA adaptor is used? Moreover, even if the cable transmits the analog signal, if it's plugged at the DVI input of the monitor, I believe the monitor will take digital signal from there. Even if there is also analog signal in the cable, it should be ignored in the DVI input. -- Perfect day for scrubbing the floor and other exciting things. Eduardo M KALINOWSKI edua...@kalinowski.com.br -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100308105331.1471364casmjy...@mail.kalinowski.com.br
Re: How to know if DVI connection is digital or analogue?
On Mon, Mar 8, 2010 at 8:53 AM, Eduardo M KALINOWSKI edua...@kalinowski.com.br wrote: On Seg, 08 Mar 2010, Dotan Cohen wrote: Is there no way to tell which type of connection is being used? For whatever reason, it is important to him to know that the connection is digital. I might be saying complete bullshit, but do DVI cables carry tha analog signal? It's true the connectors in VGA boards have both signals, but shouldn't a standard DVI cable only transmit the digital signal and ignore the analog part, which is used only when a DVI-VGA adaptor is used? Moreover, even if the cable transmits the analog signal, if it's plugged at the DVI input of the monitor, I believe the monitor will take digital signal from there. Even if there is also analog signal in the cable, it should be ignored in the DVI input. DVI-I cables carry both digital and analogue signal. DVI-D carries digital only. This is especially useful when you run into a situation where a video card only has DVI connectors but a monitor only accepts VGA. A converter can easily be used. http://en.wikipedia.org/wiki/Digital_Visual_Interface -- Jordan Metzmeier -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/50e5edd51003080602k2ea1af39xd6e4276eb3a4c...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Mon, 08 Mar 2010 15:47:07 +0200, Dotan Cohen wrote: Tell the user to use a DVI-D to DVI-D (only digital) cable :-) He is using the cable that came with the monitor. Can't he get a new one? Or at least, can't he determine what type of cable is it? DVI-I, DVI-D... I find that a hardware solution is the most appropiate (an easiest) method to be sure :-? Is there no way to tell which type of connection is being used? For whatever reason, it is important to him to know that the connection is digital. If video source -display- is digital (extreme A of the cable is connected to a DVI-x output) and input source -graphic card- (extreme B of the cable is connecetd to a DVI-x input) then he can only get a digital signal. What are the involved elements here, that is, graphic card and display brand/model? As per your original question, no, I don't know any software or method to analyze or test the video input signal being digital or analogic :-? Greetings, -- Camaleón -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/pan.2010.03.08.14.16...@gmail.com
Re: How to know if DVI connection is digital or analogue?
Dotan Cohen wrote: Tell the user to use a DVI-D to DVI-D (only digital) cable :-) He is using the cable that came with the monitor. Is there no way to tell which type of connection is being used? For whatever reason, it is important to him to know that the connection is digital. Check this pic: http://www.playtool.com/pages/dvicompat/sldldvi.jpg -- Odd -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/4b950a6a.8090...@runbox.no
Re: How to know if DVI connection is digital or analogue?
I might be saying complete bullshit, but do DVI cables carry tha analog signal? It's true the connectors in VGA boards have both signals, but shouldn't a standard DVI cable only transmit the digital signal and ignore the analog part, which is used only when a DVI-VGA adaptor is used? Moreover, even if the cable transmits the analog signal, if it's plugged at the DVI input of the monitor, I believe the monitor will take digital signal from there. Even if there is also analog signal in the cable, it should be ignored in the DVI input. In theory, I think that you are right. However, for whatever reason on his Windows install (same hardware, I just formatted the drive) he had a hard time configuring it to send digital. There is some software tool especially made for pendants to check this in Windows :) He does not want to buy a new cable when the current cable works fine. He just wants to know that it is digital. -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003081244n47d4o29e0d80a196a1...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On 8 March 2010 16:16, Camaleón noela...@gmail.com wrote: On Mon, 08 Mar 2010 15:47:07 +0200, Dotan Cohen wrote: Tell the user to use a DVI-D to DVI-D (only digital) cable :-) He is using the cable that came with the monitor. Can't he get a new one? Or at least, can't he determine what type of cable is it? DVI-I, DVI-D... I find that a hardware solution is the most appropiate (an easiest) method to be sure :-? Why get a new cable? His current cable works fine. He just wants to know whether the video is analogue or digital, because in Windows on the same hardware he had to especially configure it to send digital. Is there no way to tell which type of connection is being used? For whatever reason, it is important to him to know that the connection is digital. If video source -display- is digital (extreme A of the cable is connected to a DVI-x output) and input source -graphic card- (extreme B of the cable is connecetd to a DVI-x input) then he can only get a digital signal. In theory, he _should_ get digital like that. In practice, without fiddling, in Windows it was sending analogue. What are the involved elements here, that is, graphic card and display brand/model? Some ATI onboard graphics, I don't know what brand the motherboard was (it's not here with me now). The FOSS drivers work fine on it, even for KDE composting. The monitor was a MAC LCD, I think around 22 or so. As per your original question, no, I don't know any software or method to analyze or test the video input signal being digital or analogic :-? Well, we tried! Thanks. -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003081248xfbec43dt7baa15b33a907...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
Check this pic: http://www.playtool.com/pages/dvicompat/sldldvi.jpg I had no idea it was such a mess! Three different types of DVI?!? One for D, one for V, one for I?!? -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003081249x6f7c57b5g12cc243893a76...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Mon,08.Mar.10, 12:59:13, Dotan Cohen wrote: DVI supports both digital and analgue connections (that's how VGA adaptors work). I have a user who fought with his Windows drivers to force digital connection, even though he was connecting with the DVI ports over a DVI cable it was sending analogue until he configured it properly. Not that he is running a Debian derivative, how can he check which connection (digital or analogue) is being used? Notice that he can't actually _see_ and difference on the screen :) But it is important to him to know that it is in fact digital. Check /var/log/Xorg.0.log for DFP-0 or VGA-0 output(s). Regards, Andrei -- Offtopic discussions among Debian users and developers: http://lists.alioth.debian.org/mailman/listinfo/d-community-offtopic signature.asc Description: Digital signature
Re: How to know if DVI connection is digital or analogue?
Check /var/log/Xorg.0.log for DFP-0 or VGA-0 output(s). Genius! -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003081409m338cd3d5u68c657a2f3419...@mail.gmail.com
Re: How to know if DVI connection is digital or analogue?
On Mon, Mar 08, 2010 at 10:49:25PM +0200, Dotan Cohen wrote: Check this pic: http://www.playtool.com/pages/dvicompat/sldldvi.jpg I had no idea it was such a mess! Three different types of DVI?!? One for D, one for V, one for I?!? As you can see from the pictures, the pinout variations¹ allow different subsets of the pins to be used. Typically the female end on your graphics card will be DVI-I and support all options, while the cable from the display will have just the subset of the pins it needs. For example, if you connect a digital monitor to a DVI-I port it *can't* use analogue signalling: it's physically missing the C1-C4 R/G/B/HSync lines. Typically these would only be found in a DVI-VGA converter or cable. Just checked my monitors' cables and they are all DVI-D; if it's an LCD, it probably won't even have the ability to do the analogue to digital conversion, even if the connector didn't physically prevent it. There may be weird monitors out there that accept both digital and analogue inputs over DVI, but I've never seen one. If you are suffering from such a situation, using a DVI-D cable would prevent any use of analogue signalling. The only other variations are dual link (just an extra 6 pins), and DVI-A for analogue only (I've never ever seen this one, and this is just the C1-C4 pins and 3 data pins removed). Regards, Roger ¹ http://www.interfacebus.com/Design_Connector_Digital_Visual_Interface_DVI_Bus.html -- .''`. Roger Leigh : :' : Debian GNU/Linux http://people.debian.org/~rleigh/ `. `' Printing on GNU/Linux? http://gutenprint.sourceforge.net/ `-GPG Public Key: 0x25BFB848 Please GPG sign your mail. signature.asc Description: Digital signature
Re: How to know if DVI connection is digital or analogue?
As you can see from the pictures, the pinout variations¹ allow different subsets of the pins to be used. Typically the female end on your graphics card will be DVI-I and support all options, while the cable from the display will have just the subset of the pins it needs. For example, if you connect a digital monitor to a DVI-I port it *can't* Here I assume you meant DVI-D, not DVI-I? use analogue signalling: it's physically missing the C1-C4 R/G/B/HSync lines. Typically these would only be found in a DVI-VGA converter or cable. Just checked my monitors' cables and they are all DVI-D; if it's an LCD, it probably won't even have the ability to do the analogue to digital conversion, even if the connector didn't physically prevent it. There may be weird monitors out there that accept both digital and analogue inputs over DVI, but I've never seen one. If you are suffering from such a situation, using a DVI-D cable would prevent any use of analogue signalling. The only other variations are dual link (just an extra 6 pins), and DVI-A for analogue only (I've never ever seen this one, and this is just the C1-C4 pins and 3 data pins removed). I'll forward this message on exactly, it explains exactly the situation perfectly. Thank you! -- Dotan Cohen http://bido.com http://what-is-what.com Please CC me if you want to be sure that I read your message. I do not read all list mail. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/880dece01003082322n61a470fsc15691e2c2928...@mail.gmail.com
