[xorg-edgers] radeon driver requires kernel DRM patch in latest git build

[Will Rouesnel]

The most recent builds of xorg-edgers radeon driver (1:7.0.99+git20121207.793e1b0e-0ubuntu0sarvatt), running with the PPA kernel 3.7.0.7.11) lead to extensive graphical corruption in both the framebuffer mode and when running with glx.

The problem seems to be that the most recent mesa drivers have been changed to require the following kernel patch http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-fixes-3.8&id=668bbc81baf0f34df832d8aca5c7d5e19a493c68 which currently isn't in the PPA build.

Attempting to use the radeon driver yields the following in dmesg:
[ 662.151286] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 662.153203] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 662.154954] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 662.156706] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 662.198200] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 663.945896] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 669.094419] [drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation -12!
[ 670.030868] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 670.810302] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS
[ 670.817768] [drm:evergreen_vm_reg_valid] *ERROR* Invalid register 0x8040 in CS