Miles,

Thanks for your ideas! Responses follow:

Re: vbetool
I believe commenting out "SAVE_VBE_STATE=true" and 
"VBESTATE=/var/lib/acpi-support/vbestate" in /etc/default/acpi-support disables 
vbetool in the two scripts you mention in the link above. I've tried 
suspend/resume with and without vbetool but there is still no video (or garbled 
video) on resume.

Re: is 44961 the same bug?
They appear to be related, but 44961 refers to resume hibernation and this bug 
refers to resume suspend. Bug 44961 is also on a system with a Radeon Mobility 
card but it's a 9600/9700 and this one is a 7500. Not sure what laptop the bug 
reporter is using. Could be the same, but there's not enough information to 
know at this point.

-- 
garbled or no video output after resume from suspend (Inspiron 4150)
https://launchpad.net/bugs/31425

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