"Universal Serial Bug - a tale of spontaneous modem resets" ( 2024 )

Saturday at 12:30, 40 minutes, H.1309 (Van Rijn), H.1309 (Van Rijn), FOSS on Mobile Devices devroom Sebastian Krzyszkowiak , slides , video

Case-study on how we (re)discovered and worked around a bug in USB 2.0 specification that leads to race conditions when resuming from USB suspend, which affected the cellular modem module used in the Librem 5 phone.