[Bug 1050350] Re: a-10 4600m boots to black screen unless nomodeset option in grub with kernel newer than 3.2

[madbiologist]

If you want to use the open source radeon driver instead of fglrx,
support for AMD's "Trinity" APU's was only introduced in the 3.4 kernel.
However then you might run into a bug which was fixed in the upstream
3.6-rc4 kernel thanks to this commit:

author Alex Deucher
Wed, 29 Aug 2012 23:48:26 +0000 (19:48 -0400)
committer Alex Deucher
Wed, 29 Aug 2012 23:57:34 +0000 (19:57 -0400)
commit 41fa54377057ab38bc3e08ebb46168a7daf2e63b
tree 3e70aac9f70cff8479514e81a45403f9c961dd47
parent f54b350d89bf16d31593b935bafccf510ff4a708

drm/radeon: fix dig encoder selection on DCE61

Was using the DCE41 code which was wrong. Fixes
blank displays on a number of Trinity systems.

Signed-off-by: Alex Deucher
Cc: stable

As you can see, this was also cc'd to the stable kernel series, and was
included in the upstream kernel 3.4.12 as commit
fcb836f584992f104bcbae16829760e3db876491

** Package changed: libdrm (Ubuntu) => linux (Ubuntu)

** Tags added: precise

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https://bugs.launchpad.net/bugs/1050350

Title:
  a-10 4600m  boots to black screen unless nomodeset option in grub with
  kernel newer than 3.2

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I was very excited to try out the new beta but couldn't get it to boot
  without the nomodeset option. This problem also comes up If I upgrade
  the kernel to 3.4 or 3.5 in 12.4. I think it might be a problem with
  some trinity chips. I have tried using the discrete gpu (7490)
  disabled enabled I have no idea why lenovo chose to put a weaker
  discrete chip than the integrated one.

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