Comment 6 for bug 1407505

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Joseph Salisbury (jsalisbury) wrote : Re: No UMS support in radeon module

I see the CONFIG_DRM_RADEON_UMS kernel option was disabled in Utopic but not Trusty. However, you did not see the bug until after 3.16.0-17, but CONFIG_DRM_RADEON_UMS was also not set in 3.16.0-17.

I think our best bet is to bisect between v3.16.3 and v3.16.4. It will require testing about 8 - 10 kernels. I'll build the first test kernel and post a link to it shortly.