[Bug 92858] AMD Radeon GPU Acceleration Disabled Under Kernels 4.2.x and later versions

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92858

--- Comment #7 from Darren D. <ysxikrhn at vomoto.com> ---
(In reply to Michel Dänzer from comment #6)
> (In reply to Darren from comment #5)
> > Sadly, as of thus far, every kernel I've compiled panics at bootup, with a
> > message like this, or similar: "kernel panic. vfs unable to mount root on
> > unknown block (0,0)".
> 
> Sounds like there's a problem with the .config or maybe the root=[...]
> parameter on the kernel command line. For .config, I'd recommend starting
> with the original .config from 4.3-rc7 and then just running "make
> oldconfig".
> 
> 

And that helped--in a sense. It produced a kernel that would at least boot
partially instead of a kernel panic, but the boot froze on the distro splash
screen. It's progress, though! I edited grub.cfg (I've read not to do this, but
it was a temporary modification to test a theory) to use "nosplash" instead of
"splash" on the kernel command lin grub entry for the kernel I'd compiled, and
once I booted that kernal again, I noticied a 'could not locate modules:
template  usr/lib/modules/$KERNELVERSION" type of error. Again, no way to
screenshot it as it was early in the boot process.

I'm guessing now I've discovered the problem: Renaming the
/usr/lib/modules/$KERNELVERSION directory to something different than what the
"make modules_install" command named it when it built the directory--and prior
to running the mkinitcpio command to build the initial ramdisk--is a bad idea.
Live and learn.

I'm back on track now, and with any luck and free time between day job and
sleep, eventually I'll have a bootable kernel compiled soon so I can actually
start bisecting to locate the bad commit.

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