[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 #2 from Darren <ysxikrhn at vomoto.com> ---
(In reply to Christian König from comment #1)
> (In reply to Darren from comment #0)
> > The section pasted above of the dmesg from kernel 4.3-rc-7 indicates the
> > driver is failing on the "drm:r600_ringtest"...however, this is not a r600
> > card but a Southern Islands.
> 
> Yeah, indeed the very basic test if the command process is up and running
> didn't worked. Because of this the driver pretty much disables itself,
> except for bringing up a picture to the screen.
> 
> That r600_ringtest is used for a Verde is perfectly normal, we only got
> r100_ringtest, r300_ringtest and r600_ringtest for the different hardware
> generations.
> 
> > Steps taken while attempting to resolve the issue: I'd initiallly thought it
> > could be a firmware issue, with the linux-firmware package in the distro
> > perhaps not having been updated to support the latest kernels, but even when
> > I installed linux-firmware-git from the AUR to replace the standard
> > linux-firmware package and then booted linux 4.3-rc7, mesa was still using
> > llvmpipe instead of radeonsi, due to no GPU accel. I've also compiled the
> > 4.3.0 kernel using the tarball directly from kernel.org, and a default
> > kernel configuration file from ubuntu. When I booted into the 4.3.0 upstream
> > kernel, GPU acceleration was still disabled. As neither the source nor the
> > kernel config were from Manjaro, doesn't this rule out a distro bug and
> > indicate the issue is upstream?
> 
> Yes that sounds like somewhere between 4.1 and 4.2 a patch broke the support
> for Verde.
> 
> As far as I know we didn't changed anything related to Verde between 4.1 and
> 4.2.
> 
> Can you get the kernel source using git and then run "git bisect start v4.2
> v4.1" to figure out which patch exactly caused the regression?

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