Got it working again, I tweaked /usr/share/acpi-defaults/IBM.config:
# R50e
1834*|1842*|2670*)
ACPI_SLEEP=true;
SAVE_VIDEO_PCI_STATE=true;
###### toggled this two vars from false -> true
SAVE_VBE_STATE=true;
POST_VIDEO=true;
;;
I have a 1834, so if no one complains and it's not an obvious break, can
we separate 1834 to it's own case and set true for SAVE_VBE_STATE and
POST_VIDEO there?. Note that changing /etc/defaults/acpi-support had no
effects for me. IBM.config was always preferred when suspending.
--
vbetool breaks resume on R50e
https://bugs.launchpad.net/bugs/40621
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