[Bug 91585] [BDW] System hard lock-up on resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91585

--- Comment #11 from Jerome <an.inbox at free.fr> ---
Hi Joonas,

The bug seems to depend on KWin being the application managing the display on
resume.

In all the tests I performed so far I've been using KDE4 on Debian Jessie, and
KDE was configured NOT to lock the screen on resume (KDE setting => Hardware
section, Power Management => Advanced Settings and unselect "Lock screen on
resume") as I use FDE and the DM crypt password is enough protection. This is
not the default BTW.

Your comment made me wonder what other part of my environment the bug may
depend upon. So I first installed Gnome and did suspend/resume cycles using it:
20 cycles and no problem. On the kernel I used (Debian 4.1 from backport,
easiest one to trigger the issue so far) 3-5 cycles was enough to get a lock-up
by comparison. So there seems to be a dependency on the DE.

Then I made another test: I went back to KDE, but re-enabled "Lock screen on
resume". So on resume the screen is handled not by KWin but by the KDE
screenlock application. 20 cycles and no problem.
So it looks like the lock-up also depends on KWin being active on resume.

I'll make further tests with KDE + lock screen on resume to make sure it's
really ok. On your side, could you try installing KDE on Ubuntu, and doing
cycles with the "Lock screen on resume" option disabled?

Regarding the USB serial adapter, I don't have one right now. I'll try to get
one and try what you suggested. When the lock-up happens the USB seems dead
though: when I plug a USB mouse it's not even powered. Maybe I'll still get
some log out if it, we'll see.

Thanks

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