strange s2ram problems with the XFX Radeon R7 240 graphics card

strange s2ram problems with the XFX Radeon R7 240 graphics card

[Elmar Stellnberger]

After an upgrade of my graphics card s2ram does no more work (newest 
test so far: 4.2.5-1-ARCH):
old card: XFX Radeon R5 230 (s2ram working)
new card: XFX Radeon R7 240 (s2ram not working)
(computer: Fujitsu Esprimo E5730, Core 2 Quad)

kernel parameters where s2ram does not use to work:
radeon.modeset=0 radeon.blacklist=1 no_console_suspend

However on a single test it was working including all the suggested 
steps as freezer/devices/platform/processor/core >/sys/power/pm_test

See for the details at: 
https://bugzilla.kernel.org/show_bug.cgi?id=108541 (logs say sth. about 
WakeOnLAN and system wakeup disabled by acpi; just have a look.)
I`d suggest to direct further discussion at the report.

Have Thanks,
Elmar

p.s.: the R7 card is 2GB, passively cooled, low/normal profile an works 
well in 3840x2160/UHD.