From Newsgroup: comp.sys.raspberry-pi

I'm using an RTL8812BU wifi adapter which is behaving suspiciously.
When signal strengths and throughput deteriorate the USB subsystem,
including the keyboard and pointing device, become unreliable.

This is on an old RPi2B, so armv7.

Is there a way to search for and install updates relevant to that
specific device? It's already known that a general update will break
support for a needed peripheral, an Owon USB oscilloscope. It's
necessary to be at least somewhat choosy

From what I can tell the RTL8812BU isn't very widely supported,
FreeBSD doesn't even try. I'm hopeful RasPiOS does somewhat better.

Thanks for reading,

bob prohaska

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From Newsgroup: comp.sys.raspberry-pi

On 11/01/2026 14:51, bp@www.zefox.net wrote:

I'm using an RTL8812BU wifi adapter which is behaving suspiciously.
When signal strengths and throughput deteriorate the USB subsystem,
including the keyboard and pointing device, become unreliable.

This is on an old RPi2B, so armv7.

Is there a way to search for and install updates relevant to that
specific device? It's already known that a general update will break
support for a needed peripheral, an Owon USB oscilloscope. It's
necessary to be at least somewhat choosy

From what I can tell the RTL8812BU isn't very widely supported,
FreeBSD doesn't even try. I'm hopeful RasPiOS does somewhat better.

Thanks for reading,

bob prohaska

Unless you are after the intellectual satisfaction of solving the
problem, don't waste valuable minutes you will never get back, just buy something that is better supported and works well.
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From Newsgroup: comp.sys.raspberry-pi

mm0fmf <none@invalid.com> wrote:

On 11/01/2026 14:51, bp@www.zefox.net wrote:

I'm using an RTL8812BU wifi adapter which is behaving suspiciously.
When signal strengths and throughput deteriorate the USB subsystem,
including the keyboard and pointing device, become unreliable.

This is on an old RPi2B, so armv7.

Is there a way to search for and install updates relevant to that
specific device? It's already known that a general update will break
support for a needed peripheral, an Owon USB oscilloscope. It's
necessary to be at least somewhat choosy

From what I can tell the RTL8812BU isn't very widely supported,
FreeBSD doesn't even try. I'm hopeful RasPiOS does somewhat better.

Thanks for reading,

bob prohaska

Unless you are after the intellectual satisfaction of solving the
problem, don't waste valuable minutes you will never get back, just buy something that is better supported and works well.

What do you suggest?

Thanks for writing,

bob prohaska

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From Newsgroup: comp.sys.raspberry-pi

On Sun, 11 Jan 2026 14:51:15 -0000 (UTC), bp wrote:

Is there a way to search for and install updates relevant to that
specific device? It's already known that a general update will break
support for a needed peripheral, an Owon USB oscilloscope. It's
necessary to be at least somewhat choosy

What exactly are these rCLupdatesrCY? Kernel modules? Userland drivers?
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From Newsgroup: comp.sys.raspberry-pi

Lawrence DrCOOliveiro <ldo@nz.invalid> wrote:

On Sun, 11 Jan 2026 14:51:15 -0000 (UTC), bp wrote:

Is there a way to search for and install updates relevant to that
specific device? It's already known that a general update will break
support for a needed peripheral, an Owon USB oscilloscope. It's
necessary to be at least somewhat choosy

What exactly are these rCLupdatesrCY? Kernel modules? Userland drivers?

Probably kernel modules. Right now lsusb identifies the wifi device as
Bus 001 Device 040: ID 2357:012d TP-Link Archer T3U [Realtek RTL8812BU]

Running dmesg through grep wlan0 finds
[1549933.629235] rtw_8822bu 1-1.5.2:1.0 wlan0: disabling HT/VHT/HE as WMM/QoS is not supported by the AP

The wifi dongle works but not well. When the wireless connection gets
dodgy the entire USB system, including keyboard and trackpad, slow to
the point that the machine can't be controlled and must be power-cycled.

If I try
bob@raspberrypi:~ $ sudo apt search rtw_8822bu
Sorting... Done
Full Text Search... Done

nothing is found, not even the existing driver.

Am I looking with the wrong tool?

Thanks for writing,

bob prohaska


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From Newsgroup: comp.sys.raspberry-pi

bp@www.zefox.net wrote:

Probably kernel modules. Right now lsusb identifies the wifi device as
Bus 001 Device 040: ID 2357:012d TP-Link Archer T3U [Realtek RTL8812BU]

Running dmesg through grep wlan0 finds
[1549933.629235] rtw_8822bu 1-1.5.2:1.0 wlan0: disabling HT/VHT/HE as WMM/QoS is not supported by the AP

The wifi dongle works but not well. When the wireless connection gets
dodgy the entire USB system, including keyboard and trackpad, slow to
the point that the machine can't be controlled and must be power-cycled.

If I try
bob@raspberrypi:~ $ sudo apt search rtw_8822bu
Sorting... Done
Full Text Search... Done

nothing is found, not even the existing driver.

Am I looking with the wrong tool?

"modinfo rtw_8822bu" will give you some info on the driver, though
no direct info on how it was installed. On Debian (not RPiOS) I see
there are similar modules starting with "rtw88_" installed with the
base, but no "rtw_8822bu.ko". rtw88 apparantly supports your
TP-Link Archer T3U RTL8812BU device:

https://deepwiki.com/lwfinger/rtw88/1.1-supported-hardware

Check if you have rtw88 drivers already installed:
cd /lib/modules
find -name 'rtw88*'

If so, maybe you just need to blacklist the rtw_8822bu driver to
use them? Unless the rtw88 driver is used already and it wrongly
logs as "rtw_8822bu", in which case the "modinfo rtw_8822bu"
command will fail, and look at the output of "lsmod" to see
exactly which "rtw" module/s are being used.
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From Newsgroup: comp.sys.raspberry-pi

Computer Nerd Kev <not@telling.you.invalid> wrote:

Check if you have rtw88 drivers already installed:
cd /lib/modules
find -name 'rtw88*'

If so, maybe you just need to blacklist the rtw_8822bu driver to
use them? Unless the rtw88 driver is used already and it wrongly
logs as "rtw_8822bu", in which case the "modinfo rtw_8822bu"
command will fail, and look at the output of "lsmod" to see
exactly which "rtw" module/s are being used.

Also make sure you have the package "firmware-realtek" installed
and up to date.
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