On 3.13rc6, It could be resumed normally with "nomodeset" added into grub.
Display works fine after resume from suspend.
Device S-state Status Sysfs node
SBAZ S4 *disabled pci:0000:00:14.2
EHC1 S4 *enabled pci:0000:00:12.2
OHC2 S4 *enabled pci:0000:00:13.0
OHC3 S4 *disabled
EHC3 S4 *disabled
OHC4 S4 *enabled pci:0000:00:14.5
XHC0 S4 *enabled pci:0000:00:10.0
XHC1 S4 *enabled pci:0000:00:10.1
PE20 S4 *disabled
PE21 S4 *disabled
PE22 S4 *disabled
PE23 S4 *disabled
LOM S4 *disabled pci:0000:02:00.0
P0PC S4 *disabled pci:0000:00:14.4
OHC1 S4 *enabled pci:0000:00:12.0
EHC2 S4 *enabled pci:0000:00:13.2
LID S3 *enabled
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1204339
Title:
AMD Radeon HD 7640G[1002:9903] Unable to resume from suspend with
radeon driver
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