[Bug 86565] black screen after resume from hibernation since linux kernel 3.18

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86565

Martin Steigerwald <Martin at Lichtvoll.de> changed:

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--- Comment #8 from Martin Steigerwald <Martin at Lichtvoll.de> ---
Created attachment 112375
  --> https://bugs.freedesktop.org/attachment.cgi?id=112375&action=edit
debug log of a hibernation cycle with longer delay with black screen on resume

Okay, now I catched a log with:

merkaba:~> cat /proc/version /proc/cmdline
Linux version 3.19.0-rc4-tp520-trim-all-bgroups+ (martin at merkaba) (gcc version
4.9.2 (Debian 4.9.2-10) ) #17 SMP PREEMPT Mon Jan 12 10:43:23 CET 2015
BOOT_IMAGE=/vmlinuz-3.19.0-rc4-tp520-trim-all-bgroups+
root=/dev/mapper/sata-debian ro rootflags=subvol=debian
resume=/dev/mapper/sata-swap init=/bin/systemd no_console_suspend drm.debug=0xe
initcall_debug

So this is with all debugging and it is huge.

Again for the case where I get a longer delay on resuming from hibernation.
Also on hibernation itself the power LED continued to blink and the laptop
didn´t switch off after saving the image. It may be that it would eventually do
so, but I didn´t want to have it running all night as I was about to go to bed.

On resuming I saw something interesting: I had the black screen for at least a
minute, I think more two minutes, and then I saw the tty shortly displaying
about half a screen of messages before the KDE/Plasma screen locker appeared. I
don´t know what it displayed there as I was too far away from the laptop.

Jani, I will look at your suggestion next. May take a while.

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