How is data from a Bluetooth keyboard handled by Linux? (how does it become a keystroke?)
1
I have a Bluetooth keyboard that is not functioning properly (further description below) and I'm trying to debug why.
What I've done so far:
- Connected the device using
bluetoothctl
- In
/var/lib/bluetooth/{adapter_MAC}/{keyboard_MAC}I've noticed thatClass=0x000540. I've looked this up in https://www.question-defense.com/tools/class-of-device-bluetooth-cod-list-in-binary-and-hex and found that it is indeed aKeyboardclass. - I've run
btmon, and I can see the data coming in from the keyboard (see a sample below)
What is happening:
- When a key is pressed on the keyboard, there is no output in the textbox (exception below)
- When a key is pressed on the keyboard, I have been able to see the data coming in through
btmon
- Occassionally (and I've had some trouble reproducing this, but it seems to be linked to letting the Bluetooth keyboard idle for some time), the first key that I hit is picked up and entered continuously into the textbox / terminal. For example, if I typed
abc, thenaaaaaaaaaaaaaaaaaaa.. may get entered into the terminal continuously, until I press a key on my wired keyboard.
In btmon, when I type abc I can see the following 6 messages:
a1 01 00 00 04 00 00 00 00 00 # a
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 05 00 00 00 00 00 # b
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 06 00 00 00 00 00 # c
a1 01 00 00 00 00 00 00 00 00 # keyup
My question is: How is this data handled by Linux and converted into keystrokes? What is the next step? Where are the drivers that handle this?
If it's necessary information, this is a Fedora-based distro.
linux drivers bluetooth
asked 35 mins ago
connorbodeconnorbode
1063
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add a comment |
1
I have a Bluetooth keyboard that is not functioning properly (further description below) and I'm trying to debug why.
What I've done so far:
- Connected the device using
bluetoothctl
- In
/var/lib/bluetooth/{adapter_MAC}/{keyboard_MAC}I've noticed thatClass=0x000540. I've looked this up in https://www.question-defense.com/tools/class-of-device-bluetooth-cod-list-in-binary-and-hex and found that it is indeed aKeyboardclass. - I've run
btmon, and I can see the data coming in from the keyboard (see a sample below)
What is happening:
- When a key is pressed on the keyboard, there is no output in the textbox (exception below)
- When a key is pressed on the keyboard, I have been able to see the data coming in through
btmon
- Occassionally (and I've had some trouble reproducing this, but it seems to be linked to letting the Bluetooth keyboard idle for some time), the first key that I hit is picked up and entered continuously into the textbox / terminal. For example, if I typed
abc, thenaaaaaaaaaaaaaaaaaaa.. may get entered into the terminal continuously, until I press a key on my wired keyboard.
In btmon, when I type abc I can see the following 6 messages:
a1 01 00 00 04 00 00 00 00 00 # a
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 05 00 00 00 00 00 # b
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 06 00 00 00 00 00 # c
a1 01 00 00 00 00 00 00 00 00 # keyup
My question is: How is this data handled by Linux and converted into keystrokes? What is the next step? Where are the drivers that handle this?
If it's necessary information, this is a Fedora-based distro.
linux drivers bluetooth
asked 35 mins ago
connorbodeconnorbode
1063
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
"not functioning properly" isn't very specific. Is it sometimes working? Some keys work? Wrong characters produced?
– Stephen Harris
32 mins ago
@StephenHarris occasionally, if I don't touch the keyboard for a while, then enter some keys, the first character I entered might be entered many many times on the screen (e.g. if I typedhasdlkfjasdlkfjweit will sometimes enterhhhhhhhhhhhhhhhhhhhhhhhhh.. continuously until I hit a key on my wired keyboard). I haven't determined exactly when this behavior occurs but it seems to be related to leaving the keyboard idle. other than that, no output for any keys
– connorbode
29 mins ago
1
Please edit the question to include this information; thanks.
– Stephen Harris
28 mins ago
@StephenHarris updated as requested
– connorbode
24 mins ago
FWIW, this feels like a timing issue; your device has powered down, connects, sends a signal... and the stack drops one of the messages because it's not fully sync'd. But that's just a guess :-) Thanks for updating the question, maybe someone else can give a better opinion!
– Stephen Harris
17 mins ago
add a comment |
1
1
1
I have a Bluetooth keyboard that is not functioning properly (further description below) and I'm trying to debug why.
What I've done so far:
- Connected the device using
bluetoothctl
- In
/var/lib/bluetooth/{adapter_MAC}/{keyboard_MAC}I've noticed thatClass=0x000540. I've looked this up in https://www.question-defense.com/tools/class-of-device-bluetooth-cod-list-in-binary-and-hex and found that it is indeed aKeyboardclass. - I've run
btmon, and I can see the data coming in from the keyboard (see a sample below)
What is happening:
- When a key is pressed on the keyboard, there is no output in the textbox (exception below)
- When a key is pressed on the keyboard, I have been able to see the data coming in through
btmon
- Occassionally (and I've had some trouble reproducing this, but it seems to be linked to letting the Bluetooth keyboard idle for some time), the first key that I hit is picked up and entered continuously into the textbox / terminal. For example, if I typed
abc, thenaaaaaaaaaaaaaaaaaaa.. may get entered into the terminal continuously, until I press a key on my wired keyboard.
In btmon, when I type abc I can see the following 6 messages:
a1 01 00 00 04 00 00 00 00 00 # a
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 05 00 00 00 00 00 # b
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 06 00 00 00 00 00 # c
a1 01 00 00 00 00 00 00 00 00 # keyup
My question is: How is this data handled by Linux and converted into keystrokes? What is the next step? Where are the drivers that handle this?
If it's necessary information, this is a Fedora-based distro.
linux drivers bluetooth
asked 35 mins ago
connorbodeconnorbode
1063
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a Bluetooth keyboard that is not functioning properly (further description below) and I'm trying to debug why.
What I've done so far:
- Connected the device using
bluetoothctl
- In
/var/lib/bluetooth/{adapter_MAC}/{keyboard_MAC}I've noticed thatClass=0x000540. I've looked this up in https://www.question-defense.com/tools/class-of-device-bluetooth-cod-list-in-binary-and-hex and found that it is indeed aKeyboardclass. - I've run
btmon, and I can see the data coming in from the keyboard (see a sample below)
What is happening:
- When a key is pressed on the keyboard, there is no output in the textbox (exception below)
- When a key is pressed on the keyboard, I have been able to see the data coming in through
btmon
- Occassionally (and I've had some trouble reproducing this, but it seems to be linked to letting the Bluetooth keyboard idle for some time), the first key that I hit is picked up and entered continuously into the textbox / terminal. For example, if I typed
abc, thenaaaaaaaaaaaaaaaaaaa.. may get entered into the terminal continuously, until I press a key on my wired keyboard.
In btmon, when I type abc I can see the following 6 messages:
a1 01 00 00 04 00 00 00 00 00 # a
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 05 00 00 00 00 00 # b
a1 01 00 00 00 00 00 00 00 00 # keyup
a1 01 00 00 06 00 00 00 00 00 # c
a1 01 00 00 00 00 00 00 00 00 # keyup
My question is: How is this data handled by Linux and converted into keystrokes? What is the next step? Where are the drivers that handle this?
If it's necessary information, this is a Fedora-based distro.
linux drivers bluetooth
linux drivers bluetooth
asked 35 mins ago
connorbodeconnorbode
1063
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 35 mins ago
connorbodeconnorbode
1063
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 24 mins ago
connorbode
asked 35 mins ago
connorbodeconnorbode
1063
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 35 mins ago
connorbodeconnorbode
1063
asked 35 mins ago
connorbodeconnorbode
1063
1063
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
connorbode is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
1
"not functioning properly" isn't very specific. Is it sometimes working? Some keys work? Wrong characters produced?
– Stephen Harris
32 mins ago
@StephenHarris occasionally, if I don't touch the keyboard for a while, then enter some keys, the first character I entered might be entered many many times on the screen (e.g. if I typedhasdlkfjasdlkfjweit will sometimes enterhhhhhhhhhhhhhhhhhhhhhhhhh.. continuously until I hit a key on my wired keyboard). I haven't determined exactly when this behavior occurs but it seems to be related to leaving the keyboard idle. other than that, no output for any keys
– connorbode
29 mins ago
1
Please edit the question to include this information; thanks.
– Stephen Harris
28 mins ago
@StephenHarris updated as requested
– connorbode
24 mins ago
FWIW, this feels like a timing issue; your device has powered down, connects, sends a signal... and the stack drops one of the messages because it's not fully sync'd. But that's just a guess :-) Thanks for updating the question, maybe someone else can give a better opinion!
– Stephen Harris
17 mins ago
add a comment |
1
"not functioning properly" isn't very specific. Is it sometimes working? Some keys work? Wrong characters produced?
– Stephen Harris
32 mins ago
@StephenHarris occasionally, if I don't touch the keyboard for a while, then enter some keys, the first character I entered might be entered many many times on the screen (e.g. if I typedhasdlkfjasdlkfjweit will sometimes enterhhhhhhhhhhhhhhhhhhhhhhhhh.. continuously until I hit a key on my wired keyboard). I haven't determined exactly when this behavior occurs but it seems to be related to leaving the keyboard idle. other than that, no output for any keys
– connorbode
29 mins ago
1
Please edit the question to include this information; thanks.
– Stephen Harris
28 mins ago
@StephenHarris updated as requested
– connorbode
24 mins ago
FWIW, this feels like a timing issue; your device has powered down, connects, sends a signal... and the stack drops one of the messages because it's not fully sync'd. But that's just a guess :-) Thanks for updating the question, maybe someone else can give a better opinion!
– Stephen Harris
17 mins ago
1
1
"not functioning properly" isn't very specific. Is it sometimes working? Some keys work? Wrong characters produced?
– Stephen Harris
32 mins ago
"not functioning properly" isn't very specific. Is it sometimes working? Some keys work? Wrong characters produced?
– Stephen Harris
32 mins ago
@StephenHarris occasionally, if I don't touch the keyboard for a while, then enter some keys, the first character I entered might be entered many many times on the screen (e.g. if I typed
hasdlkfjasdlkfjwe it will sometimes enter hhhhhhhhhhhhhhhhhhhhhhhhh.. continuously until I hit a key on my wired keyboard). I haven't determined exactly when this behavior occurs but it seems to be related to leaving the keyboard idle. other than that, no output for any keys– connorbode
29 mins ago
@StephenHarris occasionally, if I don't touch the keyboard for a while, then enter some keys, the first character I entered might be entered many many times on the screen (e.g. if I typed
hasdlkfjasdlkfjwe it will sometimes enter hhhhhhhhhhhhhhhhhhhhhhhhh.. continuously until I hit a key on my wired keyboard). I haven't determined exactly when this behavior occurs but it seems to be related to leaving the keyboard idle. other than that, no output for any keys– connorbode
29 mins ago
1
1
Please edit the question to include this information; thanks.
– Stephen Harris
28 mins ago
Please edit the question to include this information; thanks.
– Stephen Harris
28 mins ago
@StephenHarris updated as requested
– connorbode
24 mins ago
@StephenHarris updated as requested
– connorbode
24 mins ago
FWIW, this feels like a timing issue; your device has powered down, connects, sends a signal... and the stack drops one of the messages because it's not fully sync'd. But that's just a guess :-) Thanks for updating the question, maybe someone else can give a better opinion!
– Stephen Harris
17 mins ago
FWIW, this feels like a timing issue; your device has powered down, connects, sends a signal... and the stack drops one of the messages because it's not fully sync'd. But that's just a guess :-) Thanks for updating the question, maybe someone else can give a better opinion!
– Stephen Harris
17 mins ago
add a comment |
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1
"not functioning properly" isn't very specific. Is it sometimes working? Some keys work? Wrong characters produced?
– Stephen Harris
32 mins ago
@StephenHarris occasionally, if I don't touch the keyboard for a while, then enter some keys, the first character I entered might be entered many many times on the screen (e.g. if I typed
hasdlkfjasdlkfjweit will sometimes enterhhhhhhhhhhhhhhhhhhhhhhhhh.. continuously until I hit a key on my wired keyboard). I haven't determined exactly when this behavior occurs but it seems to be related to leaving the keyboard idle. other than that, no output for any keys– connorbode
29 mins ago
1
Please edit the question to include this information; thanks.
– Stephen Harris
28 mins ago
@StephenHarris updated as requested
– connorbode
24 mins ago
FWIW, this feels like a timing issue; your device has powered down, connects, sends a signal... and the stack drops one of the messages because it's not fully sync'd. But that's just a guess :-) Thanks for updating the question, maybe someone else can give a better opinion!
– Stephen Harris
17 mins ago