Movie capture does not work for Canon EOS R5 C

[volodkuzn]

Describe the bug

It's not possible to use ligphoto2 to control Canon R5 C in video mode. E. g. gphoto2 --set-config viewfinder=1 --wait-event=1s hangs forevers.

Name the camera
Canon EOS R5 C

libgphoto2 and gphoto2 version

gphoto2 2.5.28.1

Copyright (c) 2000-2021 Marcus Meissner and others

gphoto2 comes with NO WARRANTY, to the extent permitted by law. You may
redistribute copies of gphoto2 under the terms of the GNU General Public
License. For more information about these matters, see the files named COPYING.

This version of gphoto2 is using the following software versions and options:
gphoto2         2.5.28.1       gcc, popt(m), exif, no cdk, no aa, no jpeg, no readline
libgphoto2      2.5.31.1       standard camlibs (SKIPPING docupen lumix), gcc, no ltdl, EXIF
libgphoto2_port 0.12.2         iolibs: disk ptpip serial usb usbdiskdirect usbscsi, gcc, no ltdl, EXIF, USB, serial without locking

Actually, it's the latest master both for gphoto2 (d831dcbe5c73ad9c5956ae8e22d2ea65eedee485) and libgphoto2 (22bc898e8204dda8de7da8a575081aacef606a24).

To Reproduce
Steps to reproduce the behavior:
Connect camera in video capture mode via USB and run from terminal
gphoto2 --debug --debug-logfile=debug.log --set-config viewfinder=1 --wait-event=1s

Camera shows error message "An error has occurred. Turn the camera off, then on again." and freeze until I reinstall battery.

debug.txt
Truncated, because tail contains mainly binary data.