Bug#974172: libmutter-7-0: Impossible to unlock the screen with wayland+gdm, keybard and mouse unresponsive

Gali Drudis-Sole galids at gmail.com
Wed Nov 11 23:20:03 GMT 2020

Dear Simon,

Thanks a lot for your answer.

On Wed, 11 Nov, 2020 at 10:32, Simon McVittie <smcv at debian.org> wrote:
> Control: notfound -1 3.38.0-2
> Control: found -1 3.38.1-2
> Control: tags -1 + moreinfo
> On Wed, 11 Nov 2020 at 00:46:39 +0100, Gali Drudis-Sole wrote:
>>  After upgrading the system, locking the screen of gnome-shell under 
>> wayland,
>>  made it impossible to unlock the screen.
> This works fine for me, and presumably other GNOME users, so there 
> must be
> something specific to your system that is relevant.

Good. I hope to find it.

> What messages appeared in the system log (systemd journal) at the 
> time that
> this happened?

These two lines apear just after locking the system (gdm started with 
[debug] Enable=true). Nothing else is shown when I try to enter the 
password to unlock the screen:

Nov 11 23:04:29 mobian gsd-usb-protect[2319]: Error calling USBGuard 
DBus to change the protection after a screensaver event: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name 
org.usbguard1 was not provided by any .service files
Nov 11 23:04:29 mobian gnome-shell[2141]: Bogus presentation time 0 
travelled back in time, using current time.

> Are you using any GNOME Shell extensions?


>>  Downgrading
>>  gir1.2-mutter-7 and libmutter-7-0 to version 3.38.0-2 solved the 
>> issue.
> You reported this as a bug in version 3.38.0-2, but here you've said 
> that
> version 3.38.0-2 *doesn't* have the bug. What version did you upgrade 
> to
> that triggered this? (For now I've assumed 3.38.1-2.)

Sorry, that was my error when reporting the bug. Version 3.38.0-2 DOES 
WORK, but upgrading to the current testing version (3.38-1.2) DOES NOT 

>>  The system is a pinetab running mobian
> Mobian is a Debian derivative, and is not identical to Debian. If this
> is caused or triggered by a change made by Mobian, then changes in 
> Debian
> will not fix it.
> It might be better to report bugs in Mobian to the Mobian developers.

You are right. It could be some change in mobian that is incompatible 
with the upgrade of gir1.2-mutter-7 and libmutter-7-0. If you think 
that's the case, I'll report the bug to Mobian developers, as you 

>     smcv

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