It used to work fine until recently and I tried a lot with using older version of xserver-xorg and older kernels etc, but no luck. It is the same behavior for different users and it still crashes (as soon as gdm3 login screen starts) when the monitor is connected from the start.
When the screen freezes, I can't use the keyboard anymore, so debugging is hard. However, I can connect via ssh to the machine. Then `htop`
shows a gnome shell running at 100% cpu. I can then disconnect the monitor and restart gnome.
What could be the problem?
Where to look for error logs?
I am running Gnome 3.28.0 on a 4.15.0-2-amd64 x86_64 kernel with Debian GNU/Linux buster/sid
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Graphics: Card: Intel HD Graphics 620
Display Server: wayland (X.Org 1.19.6 )
drivers: modesetting,fbdev,ati,vesa,vmware,radeon,nouveau,amdgpu
Resolution: 2560x1440@59.91hz
OpenGL: renderer: Mesa DRI Intel HD Graphics 620 (Kaby Lake GT2)
version: 4.5 Mesa 17.3.7
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00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core
Processor Host Bridge/DRAM Registers (rev 02)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
00:1c.2 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (4) I219-V (rev 21)
3a:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
3c:00.0 Non-Volatile memory controller: Lenovo Device 0004