amdgpu hangs on boot or shutdown on AMD Raven Ridge CPU (Engineer Sample)

[Harry Wentland]

On 2018-01-31 09:31 AM, Chris Chiu wrote:
> Hi,
>     We are working with new laptops that have the AMD Ravenl Ridge
> chipset with this `/proc/cpuinfo`
> https://gist.github.com/mschiu77/b06dba574e89b9a30cf4c450eaec49bc
> 
>     With the latest kernel 4.15, there're lots of different
> panics/oops during boot so no chance to get into X. It also happens
> during shutdown. Then I tried to build kernel from
> git://people.freedesktop.org/~agd5f/linux on branch
> amd-staging-drm-next with head on commit "drm: Fix trailing semicolon"
> and update the linux-firmware. Things seem to get better, only 1 oops
> observed. Here's the oops
> https://gist.github.com/mschiu77/1a68f27272b24775b2040acdb474cdd3.

Hi Chris,

what are the steps to reproduce this oops?

Does it reproduce all the time or is it intermittent?

Can you send a dmesg with amdgpu.dc_log=1, in addition to drm.debug=0xe?

Thanks,
Harry

> However, I still get stuck on the following messages during boot very
> often
> ""
> [    4.998241] endless kernel: [drm] amdgpu kernel modesetting enabled.
> [    4.998288] endless kernel: checking generic (e0000000 7f0000) vs
> hw (e0000000 10000000)
> [    4.998289] endless kernel: fb: switching to amdgpudrmfb from EFI VGA
> ""
> I turned on drm.debug=0xe while booting, but no more information at this point.
> Anything I can do at this point?
> 
>     And there's 1 more information may be helpful. Sometimes the
> system boots OK with the blank screen, I can't switch to virtual
> console, but it did respond to the magic sys-rq key. The dmesg with
> drm.debug=0xe is here
> https://gist.github.com/mschiu77/291e47b1f07dc52be9461c55c820464c.
> 
>     I'm pretty sure it's due to the amdgpu driver. Because when I boot
> with my own kernel which disables the amdgpu driver, all these
> symptoms went away. Please suggest anything I can do for this. Thanks
> 
> Chris
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