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>> My Dell P2715Q display does work properly as a hub when it's asleep. The P2715Q has all sorts of quirks. I have a pair of them connected to my Windows compu

>> My Dell P2715Q display does work properly as a hub when it's asleep. The P2715Q has all sorts of quirks. I have a pair of them connected to my Windows computer, and when they go to sleep, Windows basically forgets where all the open windows were and disperses them somewhat randomly. Of all the monitors I've used, I've only ever experienced this with the P2715Q. I also notice that the power output of the USB ports on the monitors is barely enough to charge any recent mobile device.

tachion 10y ago
That's interesting, because it happens randomly for my two Dells connected to a MacBook Pro and I was blaming OSX for this. Have you found any hack/solution to this?
- slantyyz 10y ago
  No, I think it's the monitors themselves. Instead of "sleeping", they appear to make the OS think they've been powered down/disconnected instead. When a monitor goes to sleep, I can hear the "device disconnected" chime in Windows, which should not happen.
undersuit 10y ago
Same issue with my U2713HM when I let Windows go to sleep. I have only one of them attached to my desktop, but Win10 likes to set all my open windows to a small size when sleep happens. I guess the monitor get's reported as turned off and Windows starts up a 1024x768 "emergency desktop".
Klathmon 10y ago
>I also notice that the power output of the USB ports on the monitors is barely enough to charge any recent mobile device. That's because it's probably supplying the USB spec of 500ma. That's not a fault, it's how it should work. The usb-looking chargers that come with many recent mobile devices are using a bastardized set of "not really standards" to let them pump more juice through the USB port than is allowed.
- ProAm 10y ago
  It's probably the cable, if they use a data cable it will limit it to 500ma, but if they get a usb power only cable I bet it will supply more. You're right its probably working as designed.
  - Klathmon 10y ago
    Well technically a USB port should disconnect if you try to draw more than 500ma, and if something does draw more than 500ma it's not usb. But some do allow it to go out of spec, and if that happens you'll only be able to get that extra power if you are using a "charging only" cable (which tricks the phone into thinking it's plugged into a power-only USB outlet and it tries to draw more than 500ma). So with a USB cable (that's not actually a USB cable), plugged into a USB port (that's not actually a USB port) you can get over that, but it's not meant to run that way on several levels. It's one of the things that USB-C is meant to solve. Let the device and power source negotiate on how much can be sent and received by each (even being able to swap which way power is going). Sadly that means that cables are no longer just a bunch of metal in a wrapper, they need a set resistance or in some cases built-in IC's, and that means that now a shitty cable can cause issues.
rasz_pl 10y ago
might be a MST mode related - randomly bringing parts of the monitor online in different order makes windows think overall display geometry changed?

tachion 10y ago

That's interesting, because it happens randomly for my two Dells connected to a MacBook Pro and I was blaming OSX for this. Have you found any hack/solution to this?

slantyyz 10y ago
No, I think it's the monitors themselves. Instead of "sleeping", they appear to make the OS think they've been powered down/disconnected instead. When a monitor goes to sleep, I can hear the "device disconnected" chime in Windows, which should not happen.

undersuit 10y ago

Same issue with my U2713HM when I let Windows go to sleep. I have only one of them attached to my desktop, but Win10 likes to set all my open windows to a small size when sleep happens. I guess the monitor get's reported as turned off and Windows starts up a 1024x768 "emergency desktop".

Klathmon 10y ago

>I also notice that the power output of the USB ports on the monitors is barely enough to charge any recent mobile device. That's because it's probably supplying the USB spec of 500ma. That's not a fault, it's how it should work. The usb-looking chargers that come with many recent mobile devices are using a bastardized set of "not really standards" to let them pump more juice through the USB port than is allowed.

ProAm 10y ago
It's probably the cable, if they use a data cable it will limit it to 500ma, but if they get a usb power only cable I bet it will supply more. You're right its probably working as designed.
- Klathmon 10y ago
  Well technically a USB port should disconnect if you try to draw more than 500ma, and if something does draw more than 500ma it's not usb. But some do allow it to go out of spec, and if that happens you'll only be able to get that extra power if you are using a "charging only" cable (which tricks the phone into thinking it's plugged into a power-only USB outlet and it tries to draw more than 500ma). So with a USB cable (that's not actually a USB cable), plugged into a USB port (that's not actually a USB port) you can get over that, but it's not meant to run that way on several levels. It's one of the things that USB-C is meant to solve. Let the device and power source negotiate on how much can be sent and received by each (even being able to swap which way power is going). Sadly that means that cables are no longer just a bunch of metal in a wrapper, they need a set resistance or in some cases built-in IC's, and that means that now a shitty cable can cause issues.

rasz_pl 10y ago

might be a MST mode related - randomly bringing parts of the monitor online in different order makes windows think overall display geometry changed?