[Bug 99261] Kernel 4.10-rc2 on APU with Kaveri + Topaz : boot hangs on switch to amdgpudrmfb

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99261

            Bug ID: 99261
           Summary: Kernel 4.10-rc2 on APU with Kaveri + Topaz : boot
                    hangs on switch to amdgpudrmfb
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: nmset at netcourrier.com

Created attachment 128729
  --> https://bugs.freedesktop.org/attachment.cgi?id=128729&action=edit
kernel log on boot failure

Since testing kernel 4.10 preRC, RC1 and RC2, my laptop hangs on boot at line 
fb : switch to amdgpudrmfb from EVI VGA.

A few specs :

APU : AMD A10-7300 Radeon R6, 10 Compute Cores 4C+6G (from /proc/cpuinfo).
iGPU : 00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Kaveri
HDMI/DP Audio Controller
dGPU : 01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Topaz
XT [Radeon R7 M260/M265 / M340/M360 / M440/M445]
Xorg : 1.18.4, on Arch Linux
Boot command line : BOOT_IMAGE=/boot/vmlinuz-linux
root=UUID=76ba28b4-683c-4a39-96ef-6a1105905567 rw acpi=off (I have to use
acpi=off on 4.10-rcX to go beyonf initramfs loading)

Whatever amdgpu module's option combination I use is of no avail. These ones
(aspm=0 bapm=0 runpm=0 powerplay=1) allow me to use amdgpu on 4.9.

Attached is a kernel.log file where there is a stack trace of amdgpu module
crashing.

I can use 4.10-rc2 on my desktop with RX480 and an old Phenom II x6 CPU.

I am posting here in the hope of getting developer attention to care about this
module's crashing, on KMS seemingly. If I use nomodeset, the module gets
loaded, but obviously, there's no X session beyond.

Regards.

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