[Bug 94249] Linux incorrectly detects a Radeon GPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94249

            Bug ID: 94249
           Summary: Linux incorrectly detects a Radeon GPU
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: krejzi at email.com

I've recently got a HP Probook 470 G3 laptop, which has an onboard Intel
Skylake Graphics and an AMD Radeon R7 M340 GPU.

However, the Linux seems to detect the GPU as following:

01:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Topaz
XT [Radeon R7 M260/M265] [1002:6900] (rev 83)                                   

Which makes it a GCN 1.2 GPU which tries to use AMDGPU. That of course doesn't
work. The driver loads, but as soon as it does, it corrupts all the available
data from lspci -v output. I also can't use it with DRI_PRIME, since X server
crashes while loading amdgpu (probably due to it not being an amdgpu supported
GPU).

Wikipedia identifies the mentioned card as GCN 1.0 OLAND GPU. Windows catalyst
also claims it's R7 M340 and not R7 M360.

It's probably a BIOS issue, but can it be worked around somehow?

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