Hello,

I have experienced what it seems to be the same issue but with Nvidia GT 320. The system freezes for no good reason and I have to shut it down afterwards.

The crash occurred at 15:06. This is the output of /var/log/messages around that time.

Apr 28 15:06:36 despacho kernel: [ 3509.742681] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 0
Apr 28 15:06:37 despacho kernel: [ 3511.066925] [drm] nouveau 0000:01:00.0: PFIFO_INTR 0x04000000 - Ch 4
Apr 28 15:06:38 despacho kernel: [ 3512.391154] [drm] nouveau 0000:01:00.0: PFIFO_INTR 0x04000000 - Ch 4
Apr 28 15:06:40 despacho kernel: [ 3514.386019] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 5
Apr 28 15:06:42 despacho kernel: [ 3516.380895] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 5
Apr 28 15:06:44 despacho kernel: [ 3516.381046] [drm] nouveau 0000:01:00.0: PGRAPH TLB flush idle timeout fail: 0x00bc0001 0x00000000 0x0000106d 0x00140000
Apr 28 15:06:44 despacho kernel: [ 3518.375922] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 0
Apr 28 15:06:50 despacho kernel: [ 3518.760426] [drm] nouveau 0000:01:00.0: PGRAPH TLB flush idle timeout fail: 0xffffffff 0xffffffff 0xffffffff 0xffffffff
Apr 28 15:06:50 despacho kernel: [ 3524.343980] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 0
Apr 28 15:06:50 despacho kernel: [ 3524.343987] [drm] nouveau 0000:01:00.0: PFIFO_INTR 0x00a00000 - Ch 4
Apr 28 15:06:53 despacho kernel: [ 3526.992709] [drm] nouveau 0000:01:00.0: PRAMIN flush timeout
Apr 28 15:06:53 despacho kernel: [ 3526.992715] hrtimer: interrupt took 2606596973 ns
Apr 28 15:06:55 despacho kernel: [ 3526.992924] [drm] nouveau 0000:01:00.0: PFIFO_INTR 0x00800000 - Ch 4
Apr 28 15:06:55 despacho kernel: [ 3528.987837] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 5
Apr 28 15:06:55 despacho kernel: [ 3528.988029] [drm] nouveau 0000:01:00.0: PFIFO_INTR 0x04400000 - Ch 4
Apr 28 15:06:57 despacho kernel: [ 3530.982972] [drm] nouveau 0000:01:00.0: PGRAPH TLB flush idle timeout fail: 0x00bc0001 0x00000000 0x0000106d 0x00140000
Apr 28 15:06:59 despacho kernel: [ 3532.977851] [drm] nouveau 0000:01:00.0: vm flush timeout: engine 0
Apr 28 08:15:07 despacho NetworkManager[982]: <info> (em1): device state change: ip-config -> activated (reason 'none') [70 100 0]
Apr 28 08:15:07 despacho NetworkManager[982]: <info> Policy set 'Sistema em1' (em1) as default for IPv4 routing and DNS.
Apr 28 08:15:07 despacho NetworkManager[982]: <info> Activation (em1) successful, device activated.
Apr 28 08:15:07 despacho NetworkManager[982]: <info> Activation (em1) Stage 5 of 5 (IPv4 Commit) complete.
Apr 28 08:15:07 despacho dbus[1016]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Apr 28 08:15:07 despacho dbus-daemon[1016]: dbus[1016]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Apr 28 08:15:07 despacho dbus[1016]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Apr 28 08:15:07 despacho dbus-daemon[1016]: dbus[1016]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Apr 28 08:15:07 despacho dbus-daemon[1016]: Mounting other filesystems:  [  OK  ]
Apr 28 08:15:07 despacho systemd[1]: PID file /run/sendmail.pid not readable (yet?) after start.
Apr 28 08:15:07 despacho chronyd[1010]: Source 147.156.1.1 online
Apr 28 08:15:07 despacho chronyd[1010]: Source 89.248.104.162 online
Apr 28 08:15:07 despacho chronyd[1010]: Source 95.39.224.42 online
Apr 28 08:15:07 despacho chronyd[1010]: Source 130.206.3.166 online
Apr 28 08:15:07 despacho chronyd[1010]: Selected source 130.206.3.166

Regards,
Pepe