You have been subscribed to a public bug:

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.

** Affects: libdrm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: black bot-comment screen trinity
-- 
a-10 4600m  boots to black screen unless nomodeset option in grub with kernel 
newer than 3.2
https://bugs.launchpad.net/bugs/1050350
You received this bug notification because you are a member of Ubuntu-X, which 
is subscribed to libdrm in Ubuntu.

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