Hi,
commit in $Subject breaks suspend to disk on my box here. Reverting it ontop of 4.7-rc2 fixes the problem. DRM-specific messages in dmesg are:
[ 6.837698] [drm] radeon kernel modesetting enabled. [ 6.871372] [drm] initializing kernel modesetting (RV635 0x1002:0x9598 0x1043:0x01DA 0x00). [ 6.871387] [drm] register mmio base: 0xFEA20000 [ 6.871388] [drm] register mmio size: 65536 [ 6.871497] [drm] Detected VRAM RAM=512M, BAR=256M [ 6.871498] [drm] RAM width 128bits DDR [ 6.875602] [drm] radeon: 512M of VRAM memory ready [ 6.875603] [drm] radeon: 512M of GTT memory ready. [ 6.875619] [drm] Loading RV635 Microcode [ 6.888041] [drm] Internal thermal controller without fan control [ 6.888100] [drm] radeon: power management initialized [ 6.892400] [drm] GART: num cpu pages 131072, num gpu pages 131072 [ 6.893273] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0 [ 6.920032] [drm] PCIE GART of 512M enabled (table at 0x0000000000142000). [ 6.920232] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 6.920232] [drm] Driver supports precise vblank timestamp query. [ 6.920290] [drm] radeon: irq initialized. [ 6.951284] [drm] ring test on 0 succeeded in 0 usecs [ 7.125955] [drm] ring test on 5 succeeded in 1 usecs [ 7.131079] [drm] UVD initialized successfully. [ 7.135817] [drm] ib test on ring 0 succeeded in 0 usecs [ 7.789092] [drm] ib test on ring 5 succeeded [ 7.794502] [drm] Radeon Display Connectors [ 7.798817] [drm] Connector 0: [ 7.801963] [drm] DVI-I-1 [ 7.804825] [drm] HPD1 [ 7.807430] [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [ 7.814942] [drm] Encoders: [ 7.817985] [drm] DFP1: INTERNAL_UNIPHY [ 7.822230] [drm] CRT2: INTERNAL_KLDSCP_DAC2 [ 7.826913] [drm] Connector 1: [ 7.830033] [drm] DIN-1 [ 7.832715] [drm] Encoders: [ 7.835751] [drm] TV1: INTERNAL_KLDSCP_DAC2 [ 7.840349] [drm] Connector 2: [ 7.843466] [drm] DVI-I-2 [ 7.846326] [drm] HPD2 [ 7.848926] [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [ 7.856437] [drm] Encoders: [ 7.859479] [drm] CRT1: INTERNAL_KLDSCP_DAC1 [ 7.864162] [drm] DFP2: INTERNAL_KLDSCP_LVTMA [ 7.941480] [drm] fb mappable at 0xC0243000 [ 7.945733] [drm] vram apper at 0xC0000000 [ 7.949897] [drm] size 9216000 [ 7.953019] [drm] fb depth is 24 [ 7.956327] [drm] pitch is 7680 [ 7.959930] fbcon: radeondrmfb (fb0) is primary device [ 8.028816] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device [ 8.045087] [drm] Initialized radeon 2.45.0 20080528 for 0000:01:00.0 on minor 0 [ 28.158851] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0 [ 28.160612] [drm] PCIE GART of 512M enabled (table at 0x0000000000142000). [ 28.191669] [drm] ring test on 0 succeeded in 1 usecs [ 28.366319] [drm] ring test on 5 succeeded in 1 usecs [ 28.366323] [drm] UVD initialized successfully. [ 28.366338] [drm] ib test on ring 0 succeeded in 0 usecs [ 28.604362] ata1.00: supports DRM functions and may not be fully accessible [ 28.604405] ata2.00: supports DRM functions and may not be fully accessible [ 28.609305] ata1.00: supports DRM functions and may not be fully accessible [ 28.609410] ata2.00: supports DRM functions and may not be fully accessible [ 29.014440] [drm] ib test on ring 5 succeeded