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Can't convert HDMI to DisplayPort - root cause?
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I have a DisplayPort based monitor, and a laptop with a DP out. I recently got a second laptop with HDMI out, and went looking for a HDMI -> DP converter. I was very surprised to find that such a thing effectively doesn't seem to exist.
This answer and the Dell page it links to seem to imply that it's just not possible to go HDMI -> DP, without a very expensive converter box (not just an adaptor). However, I can't find anything that explains why this is the case. Is DP designed to be backwards compatible but can't interpret HDMI? Is it a case of HDMI-quality signal not being high enough quality to be convertible? Some other reason?
Note that this question is not looking for an adaptor - I'm looking for the underlying cause of the lack of them.
hdmi displayport adapter
asked Dec 17 '18 at 0:10
BobsonBobson
1328
add a comment |
I have a DisplayPort based monitor, and a laptop with a DP out. I recently got a second laptop with HDMI out, and went looking for a HDMI -> DP converter. I was very surprised to find that such a thing effectively doesn't seem to exist.
This answer and the Dell page it links to seem to imply that it's just not possible to go HDMI -> DP, without a very expensive converter box (not just an adaptor). However, I can't find anything that explains why this is the case. Is DP designed to be backwards compatible but can't interpret HDMI? Is it a case of HDMI-quality signal not being high enough quality to be convertible? Some other reason?
Note that this question is not looking for an adaptor - I'm looking for the underlying cause of the lack of them.
hdmi displayport adapter
asked Dec 17 '18 at 0:10
BobsonBobson
1328
Your question is somewhat misleading. It is possible to convert hdmi to display port and adapters do exist to do that. I’m not claiming to be an expert here, but DP was designed to be backward compatible with HDMI. They are two different technologies. Just like DVI was designed to easily convert to VGA. Or, how blu-ray players still play DVDs. It is not uncommon at all for newer technology to be backwards compatible with older technology to aid in adoption. Something tells me you know that, so what are you really asking? Of course it is more difficult to “convert” an old tech to a new tech.
– Appleoddity
Dec 17 '18 at 4:50
@Appleoddity I’m looking for why it only works in one direction. You can convert VGA to DVI (although it may not look good) as well as DVI to VGA. You can play a DVD in a blu-ray player, but you can’t play a blu-ray disc in a DVD only player because the disc isn’t encoded for it. If the answer is “DP controllers can detect they’re talking to an HDMI device and change protocols”, that’s a valid answer. So is “DP is HDMI plus some extra information, so it’s easy to strip but hard to generate that info”. Does that help clarify?
– Bobson
Dec 17 '18 at 6:30
@Bobson Don't go too far with that reasoning. You can convert DVI-I and DVI-A to VGA with just a simple adapter, and the other way around, but you to convert the DVI-D (that is to say, actual DVI) to VGA, you need active device. You also need an active device to convert VGA to DVI-D. That's because the DVI-A and DVI-I actually have pins for VGA signals within the connectors.
– AndrejaKo
Dec 17 '18 at 14:26
add a comment |
I have a DisplayPort based monitor, and a laptop with a DP out. I recently got a second laptop with HDMI out, and went looking for a HDMI -> DP converter. I was very surprised to find that such a thing effectively doesn't seem to exist.
This answer and the Dell page it links to seem to imply that it's just not possible to go HDMI -> DP, without a very expensive converter box (not just an adaptor). However, I can't find anything that explains why this is the case. Is DP designed to be backwards compatible but can't interpret HDMI? Is it a case of HDMI-quality signal not being high enough quality to be convertible? Some other reason?
Note that this question is not looking for an adaptor - I'm looking for the underlying cause of the lack of them.
hdmi displayport adapter
asked Dec 17 '18 at 0:10
BobsonBobson
1328
I have a DisplayPort based monitor, and a laptop with a DP out. I recently got a second laptop with HDMI out, and went looking for a HDMI -> DP converter. I was very surprised to find that such a thing effectively doesn't seem to exist.
This answer and the Dell page it links to seem to imply that it's just not possible to go HDMI -> DP, without a very expensive converter box (not just an adaptor). However, I can't find anything that explains why this is the case. Is DP designed to be backwards compatible but can't interpret HDMI? Is it a case of HDMI-quality signal not being high enough quality to be convertible? Some other reason?
Note that this question is not looking for an adaptor - I'm looking for the underlying cause of the lack of them.
hdmi displayport adapter
hdmi displayport adapter
asked Dec 17 '18 at 0:10
BobsonBobson
1328
asked Dec 17 '18 at 0:10
BobsonBobson
1328
asked Dec 17 '18 at 0:10
BobsonBobson
1328
asked Dec 17 '18 at 0:10
BobsonBobson
1328
asked Dec 17 '18 at 0:10
BobsonBobson
1328
1328
Your question is somewhat misleading. It is possible to convert hdmi to display port and adapters do exist to do that. I’m not claiming to be an expert here, but DP was designed to be backward compatible with HDMI. They are two different technologies. Just like DVI was designed to easily convert to VGA. Or, how blu-ray players still play DVDs. It is not uncommon at all for newer technology to be backwards compatible with older technology to aid in adoption. Something tells me you know that, so what are you really asking? Of course it is more difficult to “convert” an old tech to a new tech.
– Appleoddity
Dec 17 '18 at 4:50
@Appleoddity I’m looking for why it only works in one direction. You can convert VGA to DVI (although it may not look good) as well as DVI to VGA. You can play a DVD in a blu-ray player, but you can’t play a blu-ray disc in a DVD only player because the disc isn’t encoded for it. If the answer is “DP controllers can detect they’re talking to an HDMI device and change protocols”, that’s a valid answer. So is “DP is HDMI plus some extra information, so it’s easy to strip but hard to generate that info”. Does that help clarify?
– Bobson
Dec 17 '18 at 6:30
@Bobson Don't go too far with that reasoning. You can convert DVI-I and DVI-A to VGA with just a simple adapter, and the other way around, but you to convert the DVI-D (that is to say, actual DVI) to VGA, you need active device. You also need an active device to convert VGA to DVI-D. That's because the DVI-A and DVI-I actually have pins for VGA signals within the connectors.
– AndrejaKo
Dec 17 '18 at 14:26
add a comment |
Your question is somewhat misleading. It is possible to convert hdmi to display port and adapters do exist to do that. I’m not claiming to be an expert here, but DP was designed to be backward compatible with HDMI. They are two different technologies. Just like DVI was designed to easily convert to VGA. Or, how blu-ray players still play DVDs. It is not uncommon at all for newer technology to be backwards compatible with older technology to aid in adoption. Something tells me you know that, so what are you really asking? Of course it is more difficult to “convert” an old tech to a new tech.
– Appleoddity
Dec 17 '18 at 4:50
@Appleoddity I’m looking for why it only works in one direction. You can convert VGA to DVI (although it may not look good) as well as DVI to VGA. You can play a DVD in a blu-ray player, but you can’t play a blu-ray disc in a DVD only player because the disc isn’t encoded for it. If the answer is “DP controllers can detect they’re talking to an HDMI device and change protocols”, that’s a valid answer. So is “DP is HDMI plus some extra information, so it’s easy to strip but hard to generate that info”. Does that help clarify?
– Bobson
Dec 17 '18 at 6:30
@Bobson Don't go too far with that reasoning. You can convert DVI-I and DVI-A to VGA with just a simple adapter, and the other way around, but you to convert the DVI-D (that is to say, actual DVI) to VGA, you need active device. You also need an active device to convert VGA to DVI-D. That's because the DVI-A and DVI-I actually have pins for VGA signals within the connectors.
– AndrejaKo
Dec 17 '18 at 14:26
Your question is somewhat misleading. It is possible to convert hdmi to display port and adapters do exist to do that. I’m not claiming to be an expert here, but DP was designed to be backward compatible with HDMI. They are two different technologies. Just like DVI was designed to easily convert to VGA. Or, how blu-ray players still play DVDs. It is not uncommon at all for newer technology to be backwards compatible with older technology to aid in adoption. Something tells me you know that, so what are you really asking? Of course it is more difficult to “convert” an old tech to a new tech.
– Appleoddity
Dec 17 '18 at 4:50
Your question is somewhat misleading. It is possible to convert hdmi to display port and adapters do exist to do that. I’m not claiming to be an expert here, but DP was designed to be backward compatible with HDMI. They are two different technologies. Just like DVI was designed to easily convert to VGA. Or, how blu-ray players still play DVDs. It is not uncommon at all for newer technology to be backwards compatible with older technology to aid in adoption. Something tells me you know that, so what are you really asking? Of course it is more difficult to “convert” an old tech to a new tech.
– Appleoddity
Dec 17 '18 at 4:50
@Appleoddity I’m looking for why it only works in one direction. You can convert VGA to DVI (although it may not look good) as well as DVI to VGA. You can play a DVD in a blu-ray player, but you can’t play a blu-ray disc in a DVD only player because the disc isn’t encoded for it. If the answer is “DP controllers can detect they’re talking to an HDMI device and change protocols”, that’s a valid answer. So is “DP is HDMI plus some extra information, so it’s easy to strip but hard to generate that info”. Does that help clarify?
– Bobson
Dec 17 '18 at 6:30
@Appleoddity I’m looking for why it only works in one direction. You can convert VGA to DVI (although it may not look good) as well as DVI to VGA. You can play a DVD in a blu-ray player, but you can’t play a blu-ray disc in a DVD only player because the disc isn’t encoded for it. If the answer is “DP controllers can detect they’re talking to an HDMI device and change protocols”, that’s a valid answer. So is “DP is HDMI plus some extra information, so it’s easy to strip but hard to generate that info”. Does that help clarify?
– Bobson
Dec 17 '18 at 6:30
@Bobson Don't go too far with that reasoning. You can convert DVI-I and DVI-A to VGA with just a simple adapter, and the other way around, but you to convert the DVI-D (that is to say, actual DVI) to VGA, you need active device. You also need an active device to convert VGA to DVI-D. That's because the DVI-A and DVI-I actually have pins for VGA signals within the connectors.
– AndrejaKo
Dec 17 '18 at 14:26
@Bobson Don't go too far with that reasoning. You can convert DVI-I and DVI-A to VGA with just a simple adapter, and the other way around, but you to convert the DVI-D (that is to say, actual DVI) to VGA, you need active device. You also need an active device to convert VGA to DVI-D. That's because the DVI-A and DVI-I actually have pins for VGA signals within the connectors.
– AndrejaKo
Dec 17 '18 at 14:26
add a comment |
2 Answers
2
active
oldest
votes
HDMI and DisplayPort are completely different from the point of view of the signals that they send down the wires, as well as the connectors that they use. However, a DisplayPort output has the ability to detect when it's connected to a HDMI display, and send HDMI signals down the wire to that display. This only requires a passive adapter or cable with the right connectors on each end.
The reverse isn't true because HDMI is an older standard, and such a capability has never been added to the standard in the meantime. A HDMI output port can't send DisplayPort signals because it doesn't know how to do that, and it's not required to.
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
add a comment |
This works fine for me:
- Raspberry Pi Settings > Resolution > "Default - preferred monitor settings"
UGREEN HDMI to DP, HDMI to Display Converter, 4Kx2K Resolution, HDMI to DisplayPort Converter with USB Power for HDTV, LCD, monitors etc $19.95- Displayport 1.2 male to Mini Displayport female adapter (generic) $6.95
- Apple Cinema Display LED 24-Inch
answered 12 mins ago
daveyostdaveyost
112
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
oldest
votes
active
oldest
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active
oldest
votes
HDMI and DisplayPort are completely different from the point of view of the signals that they send down the wires, as well as the connectors that they use. However, a DisplayPort output has the ability to detect when it's connected to a HDMI display, and send HDMI signals down the wire to that display. This only requires a passive adapter or cable with the right connectors on each end.
The reverse isn't true because HDMI is an older standard, and such a capability has never been added to the standard in the meantime. A HDMI output port can't send DisplayPort signals because it doesn't know how to do that, and it's not required to.
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
add a comment |
HDMI and DisplayPort are completely different from the point of view of the signals that they send down the wires, as well as the connectors that they use. However, a DisplayPort output has the ability to detect when it's connected to a HDMI display, and send HDMI signals down the wire to that display. This only requires a passive adapter or cable with the right connectors on each end.
The reverse isn't true because HDMI is an older standard, and such a capability has never been added to the standard in the meantime. A HDMI output port can't send DisplayPort signals because it doesn't know how to do that, and it's not required to.
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
add a comment |
HDMI and DisplayPort are completely different from the point of view of the signals that they send down the wires, as well as the connectors that they use. However, a DisplayPort output has the ability to detect when it's connected to a HDMI display, and send HDMI signals down the wire to that display. This only requires a passive adapter or cable with the right connectors on each end.
The reverse isn't true because HDMI is an older standard, and such a capability has never been added to the standard in the meantime. A HDMI output port can't send DisplayPort signals because it doesn't know how to do that, and it's not required to.
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
HDMI and DisplayPort are completely different from the point of view of the signals that they send down the wires, as well as the connectors that they use. However, a DisplayPort output has the ability to detect when it's connected to a HDMI display, and send HDMI signals down the wire to that display. This only requires a passive adapter or cable with the right connectors on each end.
The reverse isn't true because HDMI is an older standard, and such a capability has never been added to the standard in the meantime. A HDMI output port can't send DisplayPort signals because it doesn't know how to do that, and it's not required to.
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
answered Dec 17 '18 at 9:02
Alex TaylorAlex Taylor
361
361
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
add a comment |
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
This is most of what I’m looking for. Can you add why a DisplayPort input isn’t also capable of interpreting hdmi?
– Bobson
Dec 17 '18 at 12:47
add a comment |
This works fine for me:
- Raspberry Pi Settings > Resolution > "Default - preferred monitor settings"
UGREEN HDMI to DP, HDMI to Display Converter, 4Kx2K Resolution, HDMI to DisplayPort Converter with USB Power for HDTV, LCD, monitors etc $19.95- Displayport 1.2 male to Mini Displayport female adapter (generic) $6.95
- Apple Cinema Display LED 24-Inch
answered 12 mins ago
daveyostdaveyost
112
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
add a comment |
This works fine for me:
- Raspberry Pi Settings > Resolution > "Default - preferred monitor settings"
UGREEN HDMI to DP, HDMI to Display Converter, 4Kx2K Resolution, HDMI to DisplayPort Converter with USB Power for HDTV, LCD, monitors etc $19.95- Displayport 1.2 male to Mini Displayport female adapter (generic) $6.95
- Apple Cinema Display LED 24-Inch
answered 12 mins ago
daveyostdaveyost
112
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
add a comment |
This works fine for me:
- Raspberry Pi Settings > Resolution > "Default - preferred monitor settings"
UGREEN HDMI to DP, HDMI to Display Converter, 4Kx2K Resolution, HDMI to DisplayPort Converter with USB Power for HDTV, LCD, monitors etc $19.95- Displayport 1.2 male to Mini Displayport female adapter (generic) $6.95
- Apple Cinema Display LED 24-Inch
answered 12 mins ago
daveyostdaveyost
112
This works fine for me:
- Raspberry Pi Settings > Resolution > "Default - preferred monitor settings"
UGREEN HDMI to DP, HDMI to Display Converter, 4Kx2K Resolution, HDMI to DisplayPort Converter with USB Power for HDTV, LCD, monitors etc $19.95- Displayport 1.2 male to Mini Displayport female adapter (generic) $6.95
- Apple Cinema Display LED 24-Inch
answered 12 mins ago
daveyostdaveyost
112
answered 12 mins ago
daveyostdaveyost
112
answered 12 mins ago
daveyostdaveyost
112
answered 12 mins ago
daveyostdaveyost
112
112
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
add a comment |
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
That is definitely far cheaper than I've seen similar items anywhere else. Interesting.
– Bobson
5 mins ago
add a comment |
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Your question is somewhat misleading. It is possible to convert hdmi to display port and adapters do exist to do that. I’m not claiming to be an expert here, but DP was designed to be backward compatible with HDMI. They are two different technologies. Just like DVI was designed to easily convert to VGA. Or, how blu-ray players still play DVDs. It is not uncommon at all for newer technology to be backwards compatible with older technology to aid in adoption. Something tells me you know that, so what are you really asking? Of course it is more difficult to “convert” an old tech to a new tech.
– Appleoddity
Dec 17 '18 at 4:50
@Appleoddity I’m looking for why it only works in one direction. You can convert VGA to DVI (although it may not look good) as well as DVI to VGA. You can play a DVD in a blu-ray player, but you can’t play a blu-ray disc in a DVD only player because the disc isn’t encoded for it. If the answer is “DP controllers can detect they’re talking to an HDMI device and change protocols”, that’s a valid answer. So is “DP is HDMI plus some extra information, so it’s easy to strip but hard to generate that info”. Does that help clarify?
– Bobson
Dec 17 '18 at 6:30
@Bobson Don't go too far with that reasoning. You can convert DVI-I and DVI-A to VGA with just a simple adapter, and the other way around, but you to convert the DVI-D (that is to say, actual DVI) to VGA, you need active device. You also need an active device to convert VGA to DVI-D. That's because the DVI-A and DVI-I actually have pins for VGA signals within the connectors.
– AndrejaKo
Dec 17 '18 at 14:26