Comment 3 for bug 1919266

issues in prior comment are likely

Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ------------[ cut here ]------------
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: WARNING: CPU: 1 PID: 6134 at drivers/gpu/drm/nouveau/dispnv50/dis>
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: Modules linked in: nls_iso8859_1 snd_hda_codec_realtek snd_hda_co>
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: CPU: 1 PID: 6134 Comm: kworker/u4:4 Tainted: G W 5>
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: Hardware name: Hewlett-Packard HP Compaq dc7700 Small Form Factor>
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: Workqueue: events_unbound nv50_disp_atomic_commit_work [nouveau]
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: RIP: 0010:nv50_dmac_wait+0x137/0x150 [nouveau]
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: Code: ef e8 bd fd ff ff 85 c0 75 c4 41 8b 96 20 01 00 00 49 8b 46>
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: RSP: 0018:ffffa62ec205fd38 EFLAGS: 00010282
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: RAX: ffffffffffffff92 RBX: 0000000000000003 RCX: 0000000000000000
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: RDX: ffffffffffffff92 RSI: ffffa62ec205fc68 RDI: ffffa62ec205fd08
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: RBP: ffffa62ec205fd88 R08: 0000000000000000 R09: ffffa62ec205fc38
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: R10: 0000000000000030 R11: 0000000000000002 R12: 00000000fffffffb
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: R13: ffff911301e4a368 R14: ffff911301e4a3a8 R15: ffff91135ae08600
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: FS: 0000000000000000(0000) GS:ffff911366d00000(0000) knlGS:00000>
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: CR2: 00007fb398e83ff0 CR3: 000000010ff80000 CR4: 00000000000006e0
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: Call Trace:
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: base507c_ntfy_set+0x34/0xa0 [nouveau]
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: nv50_wndw_flush_set+0x6f/0x1d0 [nouveau]
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: nv50_disp_atomic_commit_tail+0x4c4/0x7a0 [nouveau]
Mar 16 13:09:47 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ? pick_next_task_fair+0x40/0x3e0
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: FS: 0000000000000000(0000) GS:ffff911366c00000(0000) knlGS:00000>
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: CR2: 00007f84e7010ba8 CR3: 0000000110a3e000 CR4: 00000000000006f0
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: Call Trace:
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: base507c_update+0x37/0x80 [nouveau]
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: nv50_disp_atomic_commit_wndw+0x61/0x80 [nouveau]
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: nv50_disp_atomic_commit_tail+0x4e2/0x7a0 [nouveau]
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ? pick_next_task_fair+0x40/0x3e0
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: nv50_disp_atomic_commit_work+0x12/0x20 [nouveau]
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: process_one_work+0x1ef/0x390
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: worker_thread+0x50/0x370
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: kthread+0x12f/0x150
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ? process_one_work+0x390/0x390
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ? __kthread_bind_mask+0x70/0x70
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ret_from_fork+0x22/0x30
Mar 16 13:08:25 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ---[ end trace a1eaade403f74221 ]---
Mar 16 13:08:27 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: nouveau 0000:01:00.0: DRM: base-0: timeout
Mar 16 13:08:29 guiverc-HP-Compaq-dc7700-Small-Form-Factor kernel: ------------[ cut here ]------------

Sorry I don't have time to explore further now, but will re-install & explore if helpful.
maybe related to `xserver-xorg-video-nouveau`