A relevant denial from comment #2 is:
AVC apparmor="DENIED" operation="open"
profile="snap.chromium.chromium" name="/run/udev/data/c166:0" pid=2802
requested_mask="r" denied_mask="r"
That should be allowed by connecting the raw-usb interface though.
Could you please ensure that said interface is connected, and repeat the
steps in comment #1 to collect more data? Thanks!
Note that edge isn't affected, because it's not packaged as a snap, and
therefore isn't subject to strict confinement as chromium is.
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Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1890365
Title:
[snap] Web Serial fails to access local device
Status in chromium-browser package in Ubuntu:
New
Bug description:
A javascript-based web page works fine when accessed through Chrome,
fails to recognize that any devices exist when accessed from Chromium
on the same Unubtu 20.04 platform.
The code includes the following snippet:
const requestOptions = {
filters: [{ usbVendorId: 0x1881 }]
};
port = await navigator.serial.requestPort(requestOptions);
await port.open({ baudrate: 9600 });
writer = port.writable.getWriter();
reader = port.readable.getReader();
Under Chrome 84.0.4147.105 (Official Build) (64-bit), ttyACM0 device
is listed in the pop-up, is selectable, and can communicate. Under
Chromium 84.0.4147.105 (Official Build) snap (64-bit), the pop-up
contains only "No compatible devices found" message.
Experimental Web Features flag is enabled in both browsers.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bug/1890365/+subscriptions
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