I am running debian-7.4.0 . I first installed debian from a usb install image with full 1080p support dueing hte installation process but then I found I had to upgrade the bios to get past the f2 bios issue so that I could enable legacy BIOS support and then upgrade again to get past the debian boot issue.
I first installed GK0042.BIO to get access to the BIOS. I had to do this with no screen.
Then I installed FY0025.BIO to get debian to boot off the HDD.
Now I can only get 1280x1024 resolution and the default 3d acceleration does not kick in either. I noticed that the resolution changed after I installed GK0042.BIO.
I can see that acceleration is supported in the driver with:
glxinfo | grep rende
direct rendering: Yes
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x209)
GL_NV_conditional_render, GL_AMD_draw_buffers_blend,