Created attachment 735702 [details]
y2log

The system is a freshly installed KVM running the latest snapshot of
tumbleweed.

When attempting to change system-wide IO scheduler to noop, this error occurs:

Details: Invalid argument @ fptr_finalize_flush -
/sys/block/vda/queue/scheduler
Caller:  /usr/share/YaST2/modules/SystemSettings.rb:252:in `write'

lsblk -O output is the following:
NAME KNAME MAJ:MIN FSTYPE MOUNTPOINT LABEL UUID                                
PARTTYPE PARTLABEL PARTUUID                             PARTFLAGS  RA RO RM
HOTPLUG MODEL SERIAL  SIZE STATE OWNER GROUP MODE       ALIGNMENT MIN-IO OPT-IO
PHY-SEC LOG-SEC ROTA SCHED RQ-SIZE TYPE DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
WSAME WWN RAND PKNAME HCTL       TRAN   SUBSYSTEMS  REV VENDOR ZONED
sr0  sr0    11:0                                                               
                                                                  512  0  1    
  1 QEMU         1024M runni root  cdrom brw-rw----         0    512      0    
512     512    1 noop      128 rom         0        0B       0B         0    0B
       1        0:0:0:0    sata   block:scsi:pci
                                                                               
                                                                               
                                                                               
                                                                               
                                             2.5+ QEMU   none
vda  vda   254:0                                                               
                                                                  512  0  0    
  0                64G       root  disk  brw-rw----         0    512      0    
512     512    1 mq-deadline
���                                                                              
                                                                               
                                                                               
                           256 disk        0        0B       0B         0    0B
       0                          block:virtio:pci
���                                                                              
                                                                               
                                                                               
                                                                               
                                                  0x1af4 none
������vda1                                                                         
���    vda1  254:1   swap   [SWAP]           aeec6ca8-628d-49e3-ae58-1daf1c3accc2
0x82               328c4097-01                                    512  0  0    
  0                 2G       root  disk  brw-rw----         0    512      0    
512     512    1 mq-deadline
���                                                                              
                                                                               
                                                                               
                           256 part        0        0B       0B         0    0B
       0 vda                      block:virtio:pci
���                                                                              
                                                                               
                                                                               
                                                                               
                                                         none
������vda2                                                                         
     vda2  254:2   ext4   /                f871d33d-0b38-4b2d-b9e0-ba204b2bb05e
0x83               328c4097-02                          0x80      512  0  0    
  0                62G       root  disk  brw-rw----         0    512      0    
512     512    1 mq-deadline
                                                                               
                                                                               
                                                                               
                           256 part        0        0B       0B         0    0B
       0 vda                      block:virtio:pci
                                                                               
                                                                               
                                                                               
                                                                               
                                                         none