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Fabrizio Romano Genovese:
> In trying to make my wifi adapter working, I decided to try `kernel-latest`
> on Dom0, which installed kernel `5.10.11-1.fc25.qubes.x86_64`. The result
> is a system where I cannot start VMs (not even VMs with no devices
> connected to them) due to `libvirt` errors ( The kernel doesn't support
> reset from sysfs for PCI device ...).
>
> I tried to go back to my old kernels by changing `xen.cfg` in
> `/boot/efi/EFI/qubes` (here I have options 5.4.90-1.qubes.x86_64 and
> 5.4.91-1.fc25.qubes.x86_64, besides the one I mentioned above). The real
> big problem is that these kernels do not seem to appear to work anymore. As
> soon as I change `default` in `xen.cgf` selecting one of these two kernels,
> I am not able to access the system (after I insert the LUKS passphrase I
> get black screen in the authorization manager. Moreover, from boot messages
> it seems that neither these kernel can start sys-net anymore).
>
>
> Any suggestion is really appreciated, I spent the last week configuring my
> PC and I would literally break into tears if I had to re-do everything from
> scratch.
Did you also install kernel-latest-qubes-vm (in addition to
kernel-latest) in dom0? Then maybe that too happens to be somehow
broken on your system.
If you can log in on a console (Ctrl-Alt-F2) *after* all your
autostart VMs have failed to start, check 'qubes-prefs default_kernel'
and try setting the VM kernel to another version - i.e. to one of the
directory names in /var/lib/qubes/vm-kernels/ - like this:
qubes-prefs default_kernel 5.4.90-1
qubes-prefs default_kernel 5.4.91-1.fc25
If you can't log in at all, you could mount the root filesystem from a
Qubes installer console and edit the 'default_kernel' property inside
var/lib/qubes/qubes.xml on the root filesystem mountpoint.
Rusty
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