KVM Support: Disabled

[raywood]

I'm using LMX 18.3. I start Virtual Machine Manager (virt-manager). I power on an LMC 18.3 VM. It runs, but it gives me a warning: "Running in software rendering mode. Cinnamon is currently running without video hardware acceleration ..." I enter sudo qemu-system-x86_64 -hda [VM path & name].qcow2 > Ctrl-Alt-2 > info kvm. It says, "kvm support: disabled." That qemu-system-x86_64 command also produces, "Warning: TCG doesn't support requested feature: CPUID.01H:ECX.vmx [bit 5]." lsmod | grep kvm produces a value of zero in the right column for kvm_intel.

Adding --enable-kvm results in info kvm = "kvm support: enabled." The full syntax is thus sudo qemu-system-x86_64 --enable-kvm -hda [VM path & name].qcow2. But the "software rendering mode" warning still comes up in the VM.

uname -a says I am running x86_64. egrep -c ' lm ' /proc/cpuinfo produces a 4. kvm-ok says "/dev/kvm exists. KVM acceleration can be used." My user (ray) is a member of the kvm group. The system is booting in UEFI (secure boot disabled). The CPU is an Intel Core i5-7200U. Virtualization is enabled in the BIOS.

As far as I can tell, everything is enabled and checks out, and yet no video hardware acceleration. Ideas?

[raywood]

It tentatively appears the problem was using LMC as guest. Cinnamon -- that is, something involved with drivers in Cinnamon -- is apparently trouble-prone in a way that Mate isn't. Or at least I'm not getting the error now that I've switched to a Mate VM.