'vga' is a property string, we can't just assume it starts with the
default key's value.

Signed-off-by: Fabian Grünbichler <f.gruenbich...@proxmox.com>
---
 PVE/API2/Qemu.pm | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index 974ee3b..95b1922 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -1634,7 +1634,12 @@ __PACKAGE__->register_method({
        my $websocket = $param->{websocket};
 
        my $conf = PVE::QemuConfig->load_config($vmid, $node); # check if VM 
exists
-       my $use_serial = ($conf->{vga} && ($conf->{vga} =~ m/^serial\d+$/));
+       
+       my $serial;
+       if ($conf->{vga}) {
+           my $vga = PVE::QemuServer::parse_vga($conf->{vga});
+           $serial = $vga->{type} if $vga->{type} =~ m/^serial\d+$/;
+       }
 
        my $authpath = "/vms/$vmid";
 
@@ -1650,7 +1655,7 @@ __PACKAGE__->register_method({
            (undef, $family) = PVE::Cluster::remote_node_ip($node);
            my $sshinfo = PVE::SSHInfo::get_ssh_info($node);
            # NOTE: kvm VNC traffic is already TLS encrypted or is known 
unsecure
-           $remcmd = PVE::SSHInfo::ssh_info_to_command($sshinfo, $use_serial ? 
'-t' : '-T');
+           $remcmd = PVE::SSHInfo::ssh_info_to_command($sshinfo, 
defined($serial) ? '-t' : '-T');
        } else {
            $family = PVE::Tools::get_host_address_family($node);
        }
@@ -1666,9 +1671,9 @@ __PACKAGE__->register_method({
 
            my $cmd;
 
-           if ($use_serial) {
+           if (defined($serial)) {
 
-               my $termcmd = [ '/usr/sbin/qm', 'terminal', $vmid, '-iface', 
$conf->{vga}, '-escape', '0' ];
+               my $termcmd = [ '/usr/sbin/qm', 'terminal', $vmid, '-iface', 
$serial, '-escape', '0' ];
 
                $cmd = ['/usr/bin/vncterm', '-rfbport', $port,
                        '-timeout', $timeout, '-authpath', $authpath,
-- 
2.20.1


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