Package: libdrm2 Version: 2.4.74-1 Severity: important This problem was observed on a virtual machine running stretch inside a KVM environment. The machine had been a fresh install of stretch in January 2017, updated with apt in the last 24 hours.
Last time I used my VM, I had stretched the virt-manager window to be quite large. spice-vdagent is running in the VM and the screen size adapted and it was working fine. My physical display is a 4k monitor. Next time I booted the VM, the gdm login didn't appear, just a dark gray background, it appeared to be sized at one of the default resolutions like 800x600. I connected to the VM with ssh and found this in journalctl: test-vm1 kernel: [drm:qxl_crtc_mode_set [qxl]] *ERROR* Mode doesn't fit in vram size (vgamem) test-vm1 kernel: [drm:drm_crtc_helper_set_config [drm_kms_helper]] *ERROR* failed to set mode on [CRTC:27:crtc-0] I shut down the VM and used "virsh edit test-vm1" to find the vram setting and increased it from 64M to 256M. I observed the same problem on the next boot. Then, while the gray background was visible, I tried reducing the size of the virt-manager window. As the virt-manager got smaller, the gdm login box suddenly appeared. After logging in, I was able to expand the virt-manager window again and it continued working fine. It would be useful to a) understand why this happens at boot/login time but it works fine at this resolution after login b) improve gdm, wayland or whatever so it shows something more meaningful than a gray background
