Xfce Forum

apurkrt

Member

From: Czechia, Europe

Registered: 2014-08-31

Posts: 48

[SOLVED] Unable to unlock a session - "Incorrect password"

Hi, I hit this strange issue today: I am unable to unlock a notebooks screen. The dialog for entering password shows up just fine, I enter the password and then it is "Checking..." - 2 seconds - "Incorrect password.". I checked the password typing many many times, caps lock is off, as is numlock. I can log into a virtual console (Ctrl+Alt+F2) just fine, but the only way how to "unlock" the session is either reboot or terminate X server.

I tried to wipe .config/xfce4 and started with default configuration, to no avail - upon locking the screen, I simply cannot unlock it.

I tried the same on a desktop, and there the locking and unlocking works completely fine.

Anybody has a clue what could be happening?

Last edited by apurkrt (2019-12-28 10:18:53)

ozjd

Member

From: Hawkesbury NSW Australia

Registered: 2012-02-05

Posts: 560

Website

Re: [SOLVED] Unable to unlock a session - "Incorrect password"

You need to say what you are using to lock your session. Is it a screensaver or a locker such as light locker? If it isn't the Xfce screensaver then you may get a better answer asking your distro.

apurkrt

Member

From: Czechia, Europe

Registered: 2014-08-31

Posts: 48

Re: [SOLVED] Unable to unlock a session - "Incorrect password"

It is the Xfce screensaver. The problem occurs with the default config (after wiping ~/.config/xfce4). Lock can be either as a screensaver (after some time in inactivity) or the problem also occurs when you click the user name (upper right corner in the default config) and choose "Lock Screen". The screen locks ok, but cannot be unlocked.

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 11,489

Re: [SOLVED] Unable to unlock a session - "Incorrect password"

Any screensaver errors  in your journal (assuming systemd)?

journalctl | grep xfce4-screensaver

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apurkrt

Member

From: Czechia, Europe

Registered: 2014-08-31

Posts: 48

Re: [SOLVED] Unable to unlock a session - "Incorrect password"

Any screensaver errors  in your journal (assuming systemd)?

journalctl | grep xfce4-screensaver

I use sysvinit/openrc (gentoo), so no journalctl.

I think it is a bug. The only relevant difference between the two machines (one of them working fine, the other does not) I have found so far is a difference in /etc/passwd. There are some removed accounts on the notebook from earlier experiments (mysql, mail, postmaster), perhaps that is messing up the unlocking(?) The question is how does the unlocking dialog check for password. Guess I will delve into the code.

apurkrt

Member

From: Czechia, Europe

Registered: 2014-08-31

Posts: 48

Re: [SOLVED] Unable to unlock a session - "Incorrect password"

The "Incorrect password." message can be found in https://git.xfce.org/apps/xfce4-screens … pam.c#n432 in "set_pam_error"  function, which in turn is called only from "gs_auth_verify_user".

The error seems system-wide - I created a new user and the error persists. Can log in to console, but cannot unlock a locked session.

Perhaps something is wrong with PAM(?)

PS: To "unlock" the session is is possible to just kill the xfce4-screensaver (from a virtual console). The session is saved, but apparently the screensaver does not work anymore.

Last edited by apurkrt (2019-12-28 09:58:14)

apurkrt

Member

From: Czechia, Europe

Registered: 2014-08-31

Posts: 48

Re: [SOLVED] Unable to unlock a session - "Incorrect password"

I've got it! It had nothing to do with Xfce. For whatever reason, I needed to reinstall (re-emerge) sys-libs/pam (and reboot). Now everything works fine.

Last edited by apurkrt (2019-12-28 10:22:41)