Ivan Perez's questions

I have a new pair of headphones. They are OneOdio Studio Wireless Y80B.

The BT device on my Ubuntu machines sees the headphones and is able to pair with them. Blueman shows they are trusted.

However, when I turn them on and hit connect, they connect briefly (a second), and then disconnect. When that happens, the headphones go into discovery mode and I can't even turn them off anymore (I had to plug them to the charger and unplug them).

Things I have tried/checked:

• Headphones work on Mac, iphone, and Ubuntu 21.10 they work.
• Headphones work on Galaxy Tab 2 running Android 4.2.2.
• BT device is 4.0-compatible as requested by headphone manufacturer.
• Using Ubuntu 18.04 or 20.04 makes no difference.
• Using Ubuntu on mac, or Ubuntu on dell computer makes no difference.
• Updating bluez to 5.50 made no difference.
• Removing /var/lib/bluetooth made no difference.
• Removing ~/.config/pulse, killing and restarting pulseaudio made no difference.
• Resetting the device made no difference.
• Charging the headphones all the way made no difference.

I don't know even how to begin to debug such a problem.

I am scanning documents with simple-scan and I'm finding that, if I save documents as PDF, the quality is very low, and if I afterwards save teh document as PNG, the quality is very high.

I have tried to enable "Photo" as opposed to "Text", and configured the settings to have the same resolution for text and photo. Still, the PDF has low quality (it's like its palette has been reduced to just a few colors and the resolution lowered). I'm exporting to PNG and converting with GIMP or imagemagick, but it's not an ideal solution.

Can the settings of the PDF export be configured, maybe in a config file?