[Bug 26891] Radeon KMS on Macs with EFI boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=26891

--- Comment #7 from shirk at bitspin.org 2011-05-19 03:30:41 PDT ---
(In reply to comment #3)
> I'm booting an imac12,2 in UEFI mode (need a "Run EFI in physical mode" patch
> before doing so),
> here's how :
> 1) boot from latest ubuntu live CD (hold alt, or c, at boot)
> 2) dump the bios
>    dd if=/dev/mem of=vbios.bin bs=65536 skip=12 count=1
> 3) move it to your partition's /lib/firmware/radeon/vbios.bin
> 4) use your patch, but move the radeon_read_bios_from_firmware
>    call before all other calls to get the bios (force using vbios.bin)
> 
Thats exactly what I did on my MBP however the screen flicker remains..

I'm pretty sure the BIOS is valid (dmesg identifies it as ATOM BIOS: Apple)
and strings revealed data like "Whistler Pro" which IIRC is the type code used
by
the Radeon HD 6xxx series.

Since Jérémy has a working setup with GPU acceleration I can only suspect a 
problem in the microcode. iMac12,2 has a Radeon HD 6970M which utilizes the 
CAYMAN microcode while my Radeon HD6750M is using TURKS.

So I'm stuck with working but non-accelerated radeondrmfb.

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