black screen (only mouse visible) after resume with xfce4 on kernel 5.2.0
Hi.
On two systens with fairly different hardware (a 6yr old laptop I am using
now on holiday and my new home desktop), with kernel 5.2.0 (and possibly
as low as 5.0.11) the following happens: boot, login X, hibernate (ok),
resume (also ok), unlock xfce4, stare at mouse pointer alone on a black
screen. The pointer can move, there is sound (Telegram notifications, for
example), and only keycombo that works is the one to go back to console.
Additionally, I noticed that this tends to happen only after the system
was suspended for quite a while, i.e. if I hibernate it and soon
afterwards resume it nothing strange happens. If I let it sleep for the
night, the next morning it will surely give me a black screen. When I say
that hibernate and resume are OK, I mean that the text console works just
fine and the system is in no way thrashing.
Very important: on the same laptop, if I reboot with an older kernel, say
5.0.2, after unlocking it I can use X just fine even after many cycles. I
don't have the desktop at hand until I'm back home, but I first observed
this issue around 5.0.11 (see [1])
Now the question: should I file this as a bug against the kernel package
or against xfce4?
On one hand, the fact that changing kernel creates or prevents the issue
seems to me a very strong indication this is a kernel bug, on the other
hand I am not really able to try a different desktop environment at the
moment (lack of time, lack of RAM and CPU power) and cannot completely
rule out a userspace issue (some change in the kernel not properly
accepted by the application)
Has anyone else experienced something similar? I've had a look at the logs
and I don't see anything obviously wrong or different from one case to the
other.
Thanks,
Andrea.
[1] https://github.com/M-Bab/linux-kernel-amdgpu-binaries/issues/81#issuecomment-489403571)
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