Comment # 24 on bug 1198794 from Manfred Hollstein

My system is running snapshot 20220517 which includes a rebuilt "hplip"
package; this is what I have here now:

  hplip-sane-3.22.4-1.1.x86_64
  sane-backends-1.1.1-1.4.x86_64

Unfortunately the scanner still won't be detected:

$ env SANE_DEBUG_DLL=128 scanimage -L
[08:18:30.787801] [sanei_debug] Setting debug level of dll to 128.
[08:18:30.787829] [dll] sane_init: SANE dll backend version 1.0.13 from
sane-backends 1.1.1
[08:18:30.787837] [dll] sane_init/read_dlld: attempting to open directory
`./dll.d'
[08:18:30.787843] [dll] sane_init/read_dlld: attempting to open directory
`/etc/sane.d/dll.d'
[08:18:30.787849] [dll] sane_init/read_dlld: using config directory
`/etc/sane.d/dll.d'
[08:18:30.787853] [dll] sane_init/read_dlld: considering
/etc/sane.d/dll.d/hpaio
[08:18:30.787860] [dll] sane_init/read_config: reading dll.d/hpaio
[08:18:30.787866] [dll] add_backend: adding backend `hpaio'
[08:18:30.787871] [dll] sane_init/read_dlld: done.
[08:18:30.787875] [dll] sane_init/read_config: reading dll.conf
[08:18:30.787884] [dll] add_backend: adding backend `hp2000S1'
[08:18:30.787887] [dll] add_backend: adding backend `hpgt2500'
[08:18:30.787894] [dll] sane_get_devices
[08:18:30.787897] [dll] load: searching backend `hpgt2500' in `/usr/lib64/sane'
[08:18:30.787901] [dll] load: trying to load
`/usr/lib64/sane/libsane-hpgt2500.so.1'
[08:18:30.787906] [dll] load: dlopen()ing
`/usr/lib64/sane/libsane-hpgt2500.so.1'
[08:18:30.787983] [dll] init: initializing backend `hpgt2500'
[08:18:30.792979] [dll] init: backend `hpgt2500' is version 1.0.5
[08:18:30.792984] [dll] load: searching backend `hp2000S1' in `/usr/lib64/sane'
[08:18:30.792987] [dll] load: trying to load
`/usr/lib64/sane/libsane-hp2000S1.so.1'
[08:18:30.792990] [dll] load: dlopen()ing
`/usr/lib64/sane/libsane-hp2000S1.so.1'
[08:18:30.793171] [dll] init: initializing backend `hp2000S1'
[08:18:30.793203] [dll] init: backend `hp2000S1' is version 1.0.0
[08:18:30.793207] [dll] load: searching backend `hpaio' in `/usr/lib64/sane'
[08:18:30.793211] [dll] load: trying to load
`/usr/lib64/sane/libsane-hpaio.so.1'
[08:18:30.793219] [dll] load: dlopen()ing `/usr/lib64/sane/libsane-hpaio.so.1'
[08:18:30.795823] [dll] load: dlopen() failed
(/usr/lib64/sane/libsane-hpaio.so.1: undefined symbol: _DBG)
[08:18:30.795829] [dll] sane_get_devices: found 0 devices

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
[08:18:30.795839] [dll] sane_exit: exiting
[08:18:30.795844] [dll] sane_exit: calling backend `hpgt2500's exit function
[08:18:31.796979] [dll] sane_exit: calling backend `hp2000S1's exit function
[08:18:31.797012] [dll] sane_exit: finished