f17, kernel 3.7.x does not work w/ Seymour [AMD Radeon HD 6470M]

[Maurizio Marini]

Hello
here is an Asus X73B w/ Seymour [AMD Radeon HD 6470M]
When I boot with last kernel 3.7:

Feb 17 00:33:46 tikal kernel: [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.7.6-102.fc17.x86_64 root=/dev/mapper/vg_tikal-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_tikal/lv_swap SYSFONT=True rd.luks=0 rd.lvm.lv=vg_tikal/lv_root KEYTABLE=it LANG=en_US.UTF-8 rhgb quiet
Feb 17 00:38:54 tikal kernel: [    0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.7.3-101.fc17.x86_64 root=/dev/mapper/vg_tikal-lv_root ro rd.md=0 rd.dm=0 rd.lvm.lv=vg_tikal/lv_swap SYSFONT=True rd.luks=0 rd.lvm.lv=vg_tikal/lv_root KEYTABLE=it LANG=en_US.UTF-8 rhgb quiet

boot stops with balnk screen, when I boot with vmlinuz-3.6.7-4.fc17.x86_64, all goes ok

in messages i find more and more of this lines until I poweroff notebook:

Feb 16 22:38:50 tikal kernel: [   78.004117] radeon 0000:01:00.0: couldn't schedule ib
Feb 16 22:38:50 tikal kernel: [   78.004137] [drm:radeon_cs_ib_chunk] *ERROR* Failed to schedule IB !

-m
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