AMDGPU with 4.19.x kernel - cannot enable DPM

[Alex Deucher]

On Thu, Nov 22, 2018 at 7:23 PM Chris Rankin <rankincj at gmail.com> wrote:
>
> Hi,
>
> I have recently tried to use dpm=1 with the amdgpu driver for the 4.19.x kernel, but unfortunately the screen just went black. This is a regression from the 4.18.x kernel.
>
> I have attached the full dmesg log, but the relevant section look to be:
>
> [    8.958679] WARNING: CPU: 0 PID: 320 at drivers/gpu/drm/drm_mm.c:950 drm_mm_takedown+0x1f/0x30 [drm]
> [    9.010509] Code: f6 c3 48 8d 41 c0 eb bb 0f 1f 00 66 66 66 66 90 48 8b 47 38 48 83 c7 38 48 39 c7 75 01 c3 48 c7 c7 a0 68 26 c0 e8 6b 4d e8 d9 <0f> 0b c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 66 66 66 66 90
> [    9.029395] RSP: 0018:ffffae0681e8f9e8 EFLAGS: 00010282
> [    9.034681] RAX: 0000000000000000 RBX: ffff91febbb9f900 RCX: 0000000000000000
> [    9.041875] RDX: ffff91fec3a1cf00 RSI: ffff91fec3a16868 RDI: ffff91fec3a16868
> [    9.049068] RBP: ffff91feb92b29a0 R08: 0000000000000000 R09: ffff91fb800bb480
> [    9.056260] R10: ffffffff9a4e7560 R11: ffffffff9b9b616d R12: ffff91feb92b2980
> [    9.063454] R13: 0000000000000000 R14: 0000000000000170 R15: ffff91feb938aee0
> [    9.070647] FS:  00007f71200ee180(0000) GS:ffff91fec3a00000(0000) knlGS:0000000000000000
> [    9.078821] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [    9.084625] CR2: 00007f8be0615020 CR3: 000000033b014000 CR4: 00000000000006f0
>

You may need this patch depending on your platform:
https://patchwork.freedesktop.org/patch/259364/

Alex

> Cheers,
> Chris
>
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