See same issue using Ubuntu 23.10 on a HP HP ProDesk 400 G3 DM/82A5 and it uses Intel HD Graphics 630. Occasionally I will get a black screen with no ability to activate which then requires a reboot. Sometimes I will need to power off and unplug hdmi cable.
i915 0000:00:02.0: [drm] *ERROR* LSPCON mode hasn't settled 2024-02-27T13:33:30.125032-06:00 HPProDesk400 kernel: [ 3323.472414] i915 0000:00:02.0: [drm] *ERROR* LSPCON mode change timed out 2024-02-27T13:33:30.125049-06:00 HPProDesk400 kernel: [ 3323.472417] i915 0000:00:02.0: [drm] *ERROR* LSPCON mode change failed 2024-02-27T13:33:30.125049-06:00 HPProDesk400 kernel: [ 3323.472418] i915 0000:00:02.0: [drm] *ERROR* LSPCON resume failed 2024-02-27T13:33:30.133026-06:00 HPProDesk400 kernel: [ 3323.481193] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful 2024-02-27T13:33:30.149026-06:00 HPProDesk400 kernel: [ 3323.498313] i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1973098 Title: [i915] Intermittent freezing and LSPCON init failed kernel messages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1973098/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
