mic record volume too low

OK, I also note from the script you ran …

!!HDA-Intel Codec information
!!---------------------------
--startcollapse--

Codec: Conexant CX20549 (Venice)

and I recall the Conexant 5045 was renamed to the to CX20549 (Venice) per Conexant Documentation.

… so if one looks in the HD-Audio-Models.txt file, one can see these options for the 5045:

	Conexant 5045
	=============
	  laptop-hpsense    Laptop with HP sense (old model laptop)
	  laptop-micsense   Laptop with Mic sense (old model fujitsu)
	  laptop-hpmicsense Laptop with HP and Mic senses
	  benq		Benq R55E
	  laptop-hp530	HP 530 laptop
	  test		for testing/debugging purpose, almost all controls
			can be adjusted.  Appearing only when compiled with
			$CONFIG_SND_DEBUG=y

and so one could try to force one of those options in the /etc/modprobe.d/50-sound.conf file to see if that helps. But before trying that, it would be useful to get more information on your PC audio setup …

Can you provide the output of:

rpm -qa '*alsa*'
rpm -qa '*pulse*'
rpm -q libasound2
cat /etc/modprobe.d/50-sound.conf