I can confirm the kernel in groovy-proposed fixes this issue: # enable proposed cat <<EOF >/etc/apt/sources.list.d/ubuntu-$(lsb_release -cs)-proposed.list # Enable Ubuntu proposed archive deb http://archive.ubuntu.com/ubuntu/ $(lsb_release -cs)-proposed restricted main multiverse universe EOF
# pin so packages are not automatically upgraded from -proposed cat <<EOF >/etc/apt/preferences.d/proposed-updates # Configure apt to allow selective installs of packages from proposed Package: * Pin: release a=$(lsb_release -cs)-proposed Pin-Priority: 400 EOF # install kernel from proposed apt install linux-generic-hwe-20.04/groovy-proposed linux-headers-generic-hwe-20.04/groovy-proposed # ensure "quiet splash" is still set in /etc/default/grub grep quiet\ splash /etc/default/grub reboot # then I notice boot does not hang anymore with thunderbolt dock connected - \o/ ** Tags removed: verification-needed-groovy ** Tags added: verification-done-groovy -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-oem-5.6 in Ubuntu. https://bugs.launchpad.net/bugs/1902469 Title: drm/i915/dp_mst - System would hang during the boot up. Status in linux package in Ubuntu: Incomplete Status in linux-oem-5.6 package in Ubuntu: Invalid Status in linux source package in Focal: Invalid Status in linux-oem-5.6 source package in Focal: Fix Committed Status in linux source package in Groovy: Fix Committed Bug description: [Impact] The machine connect with the external monitor on dock(Thunderbolt), Then system would hang during the boot-up. [Fix] The atomic check hooks must look up the encoder to be used with a connector from the connector's atomic state, and not assume that it's the connector's current attached encoder. The latter one can change under the atomic check func, or can be unset yet as in the case of MST connectors. [test] With the patch, The machine connect with the external monitor on dock(Thunderbolt), Then system boot up successfully. [Regression Potential] Low. This patch is also verified by others and is archived in the drmtip. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1902469/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
