Before the upgrade my /var/log/kern.log used to contain these messages:

  radeonfb (0000:01:00.0): suspending to state: 2...
  radeonfb (0000:01:00.0): switching to D2 state...

now I only get

  radeonfb (0000:01:00.0): suspending to state: 2...

I suppose I should try to modprobe radeonfb force_sleep=1 next.  Maybe
my laptop (Thinkpad T42 2373-FWG) is not mentioned in the whitelist?

http://thinkwiki.org/wiki/Problem_with_high_power_drain_in_ACPI_sleep
asks for the output of lspci -d "1002:*" -vn, here is mine:

01:00.0 0300: 1002:4c57
        Subsystem: 1014:0530
        Flags: bus master, stepping, fast Back2Back, 66MHz, medium devsel, 
latency 66, IRQ 11
        Memory at e0000000 (32-bit, prefetchable) [size=128M]
        I/O ports at 3000 [size=256]
        Memory at c0100000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at c0120000 [disabled] [size=128K]
        Capabilities: <access denied>

-- 
Excessive battery usage in ACPI sleep
https://launchpad.net/bugs/65856

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