This is a small C program doing exactly the same thing as fwupd does to trigger this issue. Usage: `sudo ./read-dpcd /dev/drm_dp_aux<N>`.
To find out what <N> is, replace ExecStart property in `/lib/systemd/system/fwupd.service` from `/usr/lib/fwupd/fwupd` to `/usr/bin/strace -D -tt -y -f -o /var/lib/fwupd/strace.log /usr/lib/fwupd/fwupd`. Find the last open /dev/drm_dp_aux*. This was first reported on a premature hardware platform. It was fixed automatically with a second DVT release and without additional effort being done in the kernel space. ** Attachment added: "read-dpcd.c" https://bugs.launchpad.net/ubuntu/+source/fwupd/+bug/1826691/+attachment/5260188/+files/read-dpcd.c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1826691 Title: fwupd hangs after 19.04 upgrade from 18.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/fwupd/+bug/1826691/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
