Crash with nvidia-drivers-460 when plug-in a second screen on the HDMI port

Hello,

I can boot with a dual screen : one on the DVI port and the second on the HDMI port.

Then, if I unplug the HDMI screen, everything goes normal : the last screen is the unique screen and the display act as expected.

But, if I try to plug again the HDMI screen, the display become black and I can't do anything. I have to switch off the electricity to the computer (unpluging the HDMI screen does not work).

Here last syslog lines :

juin 16 16:26:27 PaRaZiTe kernel: NVRM: GPU at PCI:0000:01:00: GPU-22339841-e926-4ad6-27c9-a01a1812bf44
juin 16 16:26:27 PaRaZiTe kernel: NVRM: Xid (PCI:0000:01:00): 8, pid=1787, Channel 00000010
juin 16 16:26:38 PaRaZiTe kernel: nvidia-modeset: WARNING: GPU:0: Unable to read EDID for display device HDMI-0
juin 16 16:26:57 PaRaZiTe kernel: NVRM: Xid (PCI:0000:01:00): 62, pid=1787, 0a99(17d8) 00000000 00000000
juin 16 16:26:58 PaRaZiTe kernel: NVRM: Xid (PCI:0000:01:00): 32, pid=1092, Channel ID 00000008 intr 80846000
juin 16 16:26:58 PaRaZiTe kernel: NVRM: Xid (PCI:0000:01:00): 32, pid=1092, Channel ID 00000008 intr1 00000001 HCE_DBG0 00000008 HCE_DBG1 00000000

CPU : AMD Phenom(tm) II X4 955 Processor
GPU : NVIDIA GeForce GTX 970

How can I help more ?