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[Q] Bluetooth slow transfer rate, is this normal?

I've just tried transferring a file from my laptop (running Ubuntu) to my Nexus S via Bluetooth. The transfer rate started around ~10KB/s and got up to ~28Kb/s.
I've never really used Bluetooth to transfer files (other than small files from mobile to mobile). Is this rate normal? Is there anything I can do to speed this up?
Cheers

Just tried this and got a Max Transfer Rate of 18KB/s from my MacBook Pro to my Nexus S not sure what the tranfer rates are for Bluetooth.

it's slow but you should get at least around 1 Mbits in real life usage
here are details
http://en.wikipedia.org/wiki/Bluetooth
Bluetooth v2.0 + EDR
This version of the Bluetooth Core Specification was released in 2004 and is backward compatible with the previous version 1.2. The main difference is the introduction of an Enhanced Data Rate (EDR) for faster data transfer. The nominal rate of EDR is about 3 Mbit/s, although the practical data transfer rate is 2.1 Mbit/s.[23] EDR uses a combination of GFSK and Phase Shift Keying modulation (PSK) with two variants, π/4-DQPSK and 8DPSK.[25] EDR can provide a lower power consumption through a reduced duty cycle.
The specification is published as "Bluetooth v2.0 + EDR" which implies that EDR is an optional feature. Aside from EDR, there are other minor improvements to the 2.0 specification, and products may claim compliance to "Bluetooth v2.0" without supporting the higher data rate. At least one commercial device states "Bluetooth v2.0 without EDR" on its data sheet.[26]​

So you should expect around 125KB/s then?
Does anyone here get close to these rates when transferring files via Bluetooth?

At a longer file my bluetooth speed climbs to 35KB/s, but that's way too slow. My Nokia E51 was several times faster. (I've already gifted it away, so I can't measure its speed currently.)
I'm also using Ubuntu to transfer files to my Nexus S, but I don't think it's the problem, because when I've sent files directly from the Nokia to the Nexus S, it was slow, too.

OK, I've tested the speed of my old phone (Nokia E51). Interestingly, the transfer starts fast and becomes slower, but always stays above 120KB/s.
E51: Bluetooth 2.0+EDR
Nexus S: Bluetooth 2.1+EDR
Probably my USB dongle is Bluetooth 2.0, too. The Wikipedia article is not clear, but I think 2.1 must be fully compatible with 2.0. Any idea why Nexus S is so slow?

Why do tablets do the processing work?

Why do they bother to still design tablets with the CPU/GPU on board? When I think about the future of windows with windows 8 I think about tablets being heavier to run the x86 architecture and I wonder why not just use something like intels widi and transmit only the picture to a tablet and have a server plugged in doing all the processing, maybe even running another instance or switchable session of the OS attached to a standard desktop display/keyboard mouse. The tablet would of course still need a processor but only to process a ready to go image, audio and to interpret touch inputs and transmit them to the server. This would allow for larger batteries and be much more cost effective in the long run.
Of course we will still need today's style for outside the home/office but like the desktop there is still a market for the LAN only machines.
Maybe this is already available and someone can point me to where I can buy it now! :x

You want the cloud? Not ready yet. Until then, splashtop will have to do. Also, botnet.

jdeoxys said:
You want the cloud? Not ready yet. Until then, splashtop will have to do. Also, botnet.
Click to expand...
Click to collapse
No, nothing over the internet. I'm simply talking about a wireless display with a battery but one that can transmit touch inputs. Not sure how else to put it but if you have seen the wireless transmitter and receivers for HDMI, similar to this.

Does anyone see where I'm going with this? Windows 8 is touch screen but the best I could find that are desktop-like is the dell ST2220T which only has 2 touch points that is not cetified for windows 8 which I believe accepts up to 4.
Next I looked at tablets and there are a few budget(if you can call $500 with a small display, bad/slow graphics card and little storage budget) that look promising but could easily have 100 hardware issues that would drive me nuts and then theres the name brand stuff like samsungs $1,000 pc tablets which still suffer from built in gpu's that suck.
My idea would simply be the cost of a screen and battery if you already own a desktop with say, intel widi (wireless display) and some sort of input receiver to receive the touch commands from the tablet display. The performance would be virtually unlimited!

Are you basically talking about a device that connects through your local network to a transmitting PC running an OS of your choosing? Sort of like a portable monitor that doubles as a touchscreen?

Constant wifi or similar connection would drain the battery as well. Also, that would require a whole separate computer to run the system itself (if you're doing it at home), or a fast, VERY low latency broadband connection to a cloud (so forget about the device being very cheap just because you have to somehow pay for the server-side as well). Otherwise you'd be struggling with laggy UI which is the exact opposite of what everyone wants.
So... not for a few more years... or decades

Tristanlogd said:
Are you basically talking about a device that connects through your local network to a transmitting PC running an OS of your choosing? Sort of like a portable monitor that doubles as a touchscreen?
Click to expand...
Click to collapse
Like a portable monitor with touchscreen that transmits touch inputs/commands wirelessly back to the desktop just like a mouse.
I don't think transmitting through networks is a good idea and thats why I mentioned the Intel WIDI wireless display technology that is already in most new Inte'ls so all we would really need to change on the PC side is a customized wireless receiver for the touch inputs.
Hell, I'm thinking about calling a friend who is an EE and getting something made if nobody else is...lol.

aard said:
Constant wifi or similar connection would drain the battery as well. Also, that would require a whole separate computer to run the system itself (if you're doing it at home), or a fast, VERY low latency broadband connection to a cloud (so forget about the device being very cheap just because you have to somehow pay for the server-side as well). Otherwise you'd be struggling with laggy UI which is the exact opposite of what everyone wants.
So... not for a few more years... or decades
Click to expand...
Click to collapse
Eh the technology is here with http://www.intel.com/content/www/us/en/architecture-and-technology/intel-wireless-display.html
Using wifi isn't efficient, but tablets use most of their energy on the display and processing. Since all you would be doing is signal processing vs actual computation @ the tablet end you would use considerably less juice. Like Half.

You are talking direct wireless connection from tablet to monitor, not going through a wireless router or connection? Interesting idea, but why not just go through a wireless connection? Wouldn't this also kind of tether you to your pc? Splashtop or Logmein allows you to do this anywhere.

Tristanlogd said:
You are talking direct wireless connection from tablet to monitor, not going through a wireless router or connection? Interesting idea, but why not just go through a wireless connection? Wouldn't this also kind of tether you to your pc? Splashtop or Logmein allows you to do this anywhere.
Click to expand...
Click to collapse
All I'm talking about is a PC or laptop with a second display thats wireless. Then we call it a tablet because it has a touch screen that sends signals back to the PC or laptop to move the mouse or rather gestures. Not cloud computing, I have done this and it's terrible. Cloud is basically remote desktop which is choppy and worse then current tablets. What I'm talking about would make the performance increase as Intel claims virtually no latency with WIDI and even 5 milliseconds would be hard to notice considering how laggy android is as it's basically a virtual machine.
Hereis a clip I just found, not sure if it's available yet but:
Now ASUS brings another solution to the table, the WiCast, which can be connected to any computer and any television and promises latency-free 1080p video and audio.

Dual Monitor w/ MST Hub Problems (SP3)

I came into the SP3 world after many hours researching to make sure that dual external monitors was a possibility, specifically without using USB-powered "external video cards". However, after following directions that people have posted before I have the below setup, and only one external monitor is being displayed.
System: Surface Pro 3 i7 / 8GB / 512GB SSD
Microsoft Surface Docking Station
2x HP LA2206x Monitors
StarTech Triple Head DisplayPort 1.2 Multi Monitor MST Hub
StarTech Mini-DP to DP Adapter cable
Plugged in like so:
Docking Station -> Mini-DP to DP Cable -> MST Hub -> Output 1=Monitor #1, Output 2=Monitor #2
The Surface continues displaying on its screen, and Monitor #1 gets output. Monitor #2 seems like it tries to initialize (I hear the "da-dump" sound from the Surface when it gets plugged in/unplugged) but no video output.
I have tested the MST Hub on another laptop (HP Elitebook Folio 9470m) and both external monitors display without issue. The only difference between the two setups is the Mini-DP to DP adapter cable is not required/cant be used for the setup on the 9470m, as it has a full DP port on it.
Any help would be appreciated, thanks!

Have you looked in the "Screen Resolution" control panel (right-click on the Desktop) to see if the second external monitor is shown?
Have you tried using Win+P to disable the internal display?
Have you checked Device Manager to see if both external monitors are detected correctly and have working drivers?
Have you verified that MiniDP can drive multiple displays at all?
Have you verified that MiniDP can drive the total display resolution that you're trying to run off of it?
Have you verified that the SP3's video chip can drive the total display res that you're trying to get (remember that the internal display is very high resolution)?
Those are the things I'd check first, in probably not quite that order.

GoodDayToDie said:
Have you looked in the "Screen Resolution" control panel (right-click on the Desktop) to see if the second external monitor is shown?
Have you tried using Win+P to disable the internal display?
Have you checked Device Manager to see if both external monitors are detected correctly and have working drivers?
Have you verified that MiniDP can drive multiple displays at all?
Have you verified that MiniDP can drive the total display resolution that you're trying to run off of it?
Have you verified that the SP3's video chip can drive the total display res that you're trying to get (remember that the internal display is very high resolution)?
Those are the things I'd check first, in probably not quite that order.
Click to expand...
Click to collapse
1) Second external does not appear in Screen Resolution
2) Yes, however SP3 devices support 2 external plus internal as per spec sheet
3) I will check this.
4) As per SP3 and DisplayPort 1.2 spec sheet, yes
5) As per SP3 and DisplayPort 1.2 spec sheet, yes
6) It is listed on official documents as an advertised feature for 2 external as well as the internal

For #6 I was specifically asking whether it could drive that much resolution, rather than whether two externals was possible at all (you might try reducing the res on the external panel and seeing if the second wakes up). You should also make sure that your hardware all works; try things like disconnecting the first monitor and making sure the second works when plugged in (leave it in the same spot on the hub?)
Beyond that... do you have a Microsoft store nearby? Even if not, you can try calling their support people. If nothing else indicates the source of the problem, it's probably the sort of thing you should take to the people who are paid to deal with such issues.

Working an issue similar to this now. Trying to use a two Dell U2414H monitors with DisplayPort 1.2 chaining, and a DP Hub. Both end in the same result as you.
Sometimes I'm able to "trick it" and get it working but after a reboot or shutdown the 2nd monitor goes back to disabled and I have to repeat the process. Right now I have it working using one monitor on the mini-DP, and the other on a USB-3 to DP adapter.
Working Microsoft on this issue. They claim there is a KB out for a problem with the dock (2992365) but I haven't been able to pull anything up using that number online.

I didn't have any luck with a MST hub either. I ended up just getting a USB video card adapter and I'm now using my SP3 as my primary work machine with two monitors.

Try it without the dock plugging directly into the dp port on the surface

Can you give me detailed explanation?

[Completed] [Q] need help for CS918/Q7 (RK3188 QUAD CORE/ ARM 9/MALI 400)

Hi guys,
I bought this box CS918\Q7 which has RK3188 quad core processor malli 400 gpu 2 gb ram and 8 gb rom. I have got few issues
1. box outputs signal at 1080p/60 HZ 720p/60 HZ and same at 50 HZ too.
now only 720p works with my tv. while my TV is full HD when I select 1080 it flickers. furthermore to complicate my TV's refresh rate is 300HZ where as input signal from box is 60 HZ only. I dont know how will it effect. but I can see blurr in running news captions in lower part of the screen which is not noticed when I run my tv directly from cable or watch on inbuilt youtube application
2. When I am plugging in a wireless mouse. LiveTV application crashes. (It took me two days to figure out that actually its is wireless mouse causing the problem, I tried resetting the box, reinstalling google play services etc but nothing worked).
It is very difficult to navigate through its remote which is the only bad thing in this device. letters are printed on the remote but it types only numerics.I am not sure if I buy an air mouse , that also could interfere with LIveTV app which is the only reason I bought this Box.
please help
thanks in advance
Ajay

Hi,
Here is the best place to ask for help with your device,
> Hardware Hacking > Android Stick Computers
Good luck!

Thread closed. Thank you.

Comparing of Android Q/10 "Desktop Modes"

Hey there!
As many of you may have heard or even tried, there is a functional "Desktop Mode" built into Android 10 (as long as the phone vendor didn't deactivate this). This mode will, when manually activated in the developers options, act like an Desktop OS when connecting your phone to an external screen. (or without activating anything in case of e.g. Samsung DeX)
I'd like to use this Thread to gather some information about the implementations of "Desktop Mode" into the phones of different vendors, and hope you can support me with testing it out on your phones.
Things of interest are (IMHO, to be continued):
is the desktop mode working (and usable)
does the dpi setup change in the moment of connecting an external screen (or does everything look just awful big)?
(yes, I know there are apps/tools to change that)
which maximum resolution is possible?
how many screens are possible? (usually just one, ...but who knows)
do you just need an USB-C to HDMI/DP cable or a (special) docking station for connecting a screen? (if using a cable, Miracast/wireless is another option of course)
does the handset get a special 'role'/feature in desktop mode? (like Samsung devices becoming a trackpad)
are there any usage improvements implementated, e.g. like file drag'n'drop or dragging windows to the display sides to maximize them on half the screen (like in windows)
what's the connection speed of the USB-C port? (USB 2.0, USB 3.2 G1 (5 Gbps), USB 3.2 G2 (10 Gbps) or even faster!?)
is it possible to use USB mouse/keyboard or just Bluetooth, and how's the speed? (eg. does BT lag a lot?)
At the moment it seems like Samsung has the best implementation of this feature with their "DeX Mode", but i'd like to know about those things from other vendors also.
My dream is to be able to ditch my notebook/tablet/8in tab/subnotebook collection an use just one device in future. (everything else needed for 'bigger' or x86 tasks can be done on cloud instances already)
But for that purpose there needs to be more than just 'basic' OS UI without any useful features
Hope we can start a good collection here and answer also your questions regarding this topic(s).
Thank you, regards
Schwarzer Riese