Bug#837290: 20 second delay to unlock screen

[Daniel Pocock]

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On 10/09/16 14:03, Michael Biebl wrote:
> Am 10.09.2016 um 10:02 schrieb Daniel Pocock:
>> Package: gnome-shell Version: 3.14.4-1~deb8u1 Severity:
>> important
>> 
>> On one particular system, I've observed there is always a delay
>> of about 20 seconds to unlock the screen.  The logs don't contain
>> any warning or explanation.
>> 
>> The delay occurs after typing the password and pressing enter.
>> 
>> Two lines are logged in auth.log immediately after pressing
>> enter:
>> 
>> gdm-password]: pam_krb5(gdm-password:auth): user daniel
>> authenticated as daniel at REALM gdm-password]: gkr-pam: unlocked
>> login keyring
>> 
>> 
>> Then I wait and eventually the desktop appears.  No further log
>> entries appear in any /var/log/* during or after the delay.
>> 
>> These are the libpam packages on the system:
>> 
>> libpam-ck-connector:amd64 0.4.6-5 libpam-gnome-keyring
>> 3.14.0-1+b1 libpam-krb5:amd64 4.6-3+b1 libpam-modules:amd64
>> 1.1.8-3.1+deb8u1+b1 libpam-modules-bin 1.1.8-3.1+deb8u1+b1 
>> libpam-runtime 1.1.8-3.1+deb8u1 libpam-systemd:amd64
>> 215-17+deb8u4 libpam0g:amd64 1.1.8-3.1+deb8u1+b1 
>> libpam0g-dev:amd64 1.1.8-3.1+deb8u1+b1
>> 
> 
> 
> Might be a PAM configuration issue. First, I'd uninstall/purge
> libpam-ck-connector. It's not useful anymore nowadays. Second I'd
> probably disable the krb5 module.
> 
> 

Without changing anything in the system, I noticed the problem stopped
later in the afternoon.

Then I notice something else: the problem only occurs when a
particular USB device is connected.  The device is an Android phone,
it is in MTP mode and also has debugging (for adb) enabled.  When the
device is connected to USB, unlocking is slow.
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