DB Manager in 3.11 Master can't connect to PostGIS Enabled database

[northrivergeo]

postgresql -> 12
PostGIS -> 3
QGIS -> 3.11 Rev: 50514b9
Ubuntu Linux 19.10

If I use the Data Source Manager I can successfully connect to any of my Postgresql/postgis connections.

I can't connect through DB Manager on any of the databases. No Crashing results.

Connecting through dbmanager results in this:

Starting QGIS in a terminal QGIS gives me this error log (tried connecting to 3 databases):

../../src/core/qgsdatasourceuri.cpp:158 : (QgsDataSourceUri) [0ms] connection timeout ignored
../../src/core/qgsmessagelog.cpp:29 : (logMessage) [17285ms] 2020-01-29T18:48:37 PostGIS[1] Connection to database failed
could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

../../src/providers/postgres/qgspostgresconn.cpp:2185 : (connUri) [11535ms] theConnName = henrycounty
../../src/providers/postgres/qgspostgresconn.cpp:222 : (QgsPostgresConn) [0ms] New PostgreSQL connection for port=5432
../../src/core/qgsdatasourceuri.cpp:158 : (QgsDataSourceUri) [1ms] connection timeout ignored
../../src/core/qgsmessagelog.cpp:29 : (logMessage) [13252ms] 2020-01-29T18:49:02 PostGIS[1] Connection to database failed
could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

../../src/providers/postgres/qgspostgresconn.cpp:2185 : (connUri) [5206ms] theConnName = tristate
../../src/providers/postgres/qgspostgresconn.cpp:222 : (QgsPostgresConn) [0ms] New PostgreSQL connection for port=5432
../../src/core/qgsdatasourceuri.cpp:158 : (QgsDataSourceUri) [1ms] connection timeout ignored
../../src/core/qgsmessagelog.cpp:29 : (logMessage) [18788ms] 2020-01-29T18:49:25 PostGIS[1] Connection to database failed
could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

[gioman]

Confirmed also here with older PostgreSQL endpoints (don't think it matters).

[FelisPimeja]

Can also confirm on Windows with different Postgresql versions (9.5, 9.6, 10, 12)

[elpaso]

@FelisPimeja @gioman @rjhale1971

Can you please test this PR? https://github.com/qgis/QGIS/pull/34171/files

You can manually patch python code on your installation to test it, it's just a few lines of code.

[FelisPimeja]

@elpaso
It works - all is Ok for me now! Good job. Thank you.