Comment=
# 1
on bug 92858<=
/a>
from Christian K=C3=B6nig
(In reply to Darren from comment #0)
> The section pasted above of the dmesg from kerne=
l 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, exce=
pt
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 issu=
e: I'd initiallly thought it
> could be a firmware issue, with the linux-firmware package in the dist=
ro
> perhaps not having been updated to support the latest kernels, but eve=
n 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 u=
sing
> 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 up=
stream
> 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?