I am seeing this on a 4670 M96XT RV730 (iMac 11,2) with 2.6.37-rc5
[drm:radeon_process_aux_ch] *ERROR* Buffer to small for return answer 1 16
[drm] Initialized drm 1.1.0 20060810 [drm] radeon defaulting to kernel modesetting. [drm] radeon kernel modesetting enabled. [drm] initializing kernel modesetting (RV730 0x1002:0x9488). [drm] register mmio base: 0xD0420000 [drm] register mmio size: 65536 [drm] Detected VRAM RAM=256M, BAR=256M [drm] RAM width 128bits DDR [drm] radeon: 256M of VRAM memory ready [drm] radeon: 512M of GTT memory ready. [drm] radeon: irq initialized. [drm] GART: num cpu pages 131072, num gpu pages 131072 [drm] Loading RV730 Microcode [drm] ring test succeeded in 1 usecs [drm] radeon: ib pool ready. [drm] ib test succeeded in 0 usecs [drm] Enabling audio support [drm] Radeon Display Connectors [drm] Connector 0: [drm] DisplayPort [drm] HPD1 [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c [drm] Encoders: [drm] DFP1: INTERNAL_UNIPHY [drm] Connector 1: [drm] eDP [drm] HPD2 [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c [drm] Encoders: [drm] LCD1: INTERNAL_UNIPHY [drm] Connector 2: [drm] VGA [drm] DDC: 0x7f10 0x7f10 0x7f14 0x7f14 0x7f18 0x7f18 0x7f1c 0x7f1c [drm] Encoders: [drm] CRT2: INTERNAL_KLDSCP_DAC2 [drm] Special thermal controller config [drm] radeon: power management initialized [drm:radeon_process_aux_ch] *ERROR* Buffer to small for return answer 1 16 [drm] fb mappable at 0xC0142000 [drm] vram apper at 0xC0000000 [drm] size 3145728 [drm] fb depth is 24 [drm] pitch is 4096 fb0: radeondrmfb frame buffer device drm: registered panic notifier [drm] Initialized radeon 2.7.0 20080528 for 0000:01:00.0 on minor 0