HI Luis,

Let us trace the issue one by one.


IB test fail:

This should be regression issue on 4.18, you can bisect the kernel patches.

GPU hang:

Fix IB test fail first.


Thanks

JimQu



On 2018年07月11日 17:34, Luís Mendes wrote:
Hi Jim,

Thanks for your interest in this issue. Actually this is a multiple issue... not only the IB ring test is failing... as I am having quite some trouble getting the cards SAPPHIRE RX 550 4GB on a Tyan S7025 and SAPPHIRE RX 460 2GB on a TYAN S7002 to work, both systems using same Ubuntu 18.04 with vanilla kernel.

*1. May you also test earlier kernel? v4.17 or v4.16.*
I've tested kernels v4.17.5 and v4.16.6 with same system and both are able to pass the IB ring test and system boots into X using NVIDIA as the display connected card. dmesg log attached for kernel 4.17.5, file TYAN_S7025_kernelv4.17.5_amdgpu_IB_ring_test_OK.txt.

*2. May you test the issue only with amdgpu?*
- I've tested on a TYAN S7002 system with a single SAPPHIRE RX 460 2GB, on-board VGA enabled and used as primary display. Kernel v4.18-rc4 fails the IB ring test, system is able to enter X through the on-board VGA. dmesg log attached for kernel 4.18-rc4, file TYAN_S7002_kernel_v4.18-rc4_IB_ring_test_fail.txt.

- Same TYAN S7002 system, but now with on-board VGA disabled and using RX 460 as display connected card. Kernels v4.17.5 and v4.16.6 are able to pass the IB ring test, but GPU hangs before entering X. Don't have logs for these yet.

Regards,
Luís Mendes
Aparapi contributor and MSc Researcher





On Wed, Jul 11, 2018 at 3:49 AM, Qu, Jim <jim...@amd.com <mailto:jim...@amd.com>> wrote:

    Hi Luis,

    1. May you also test earlier kernel? v4.17 or v4.16.
    2. May you test the issue only with amdgpu?

    Thanks
    JimQu

    ________________________________________
    发件人: amd-gfx <amd-gfx-boun...@lists.freedesktop.org
    <mailto:amd-gfx-boun...@lists.freedesktop.org>> 代表 Luís Mendes
    <luis.p.men...@gmail.com <mailto:luis.p.men...@gmail.com>>
    发送时间: 2018年7月11日 6:04:00
    收件人: Michel Dänzer; Koenig, Christian; amd-gfx list
    主题: Re: Regression with kernel 4.18 - AMD RX 550 fails IB ring
    test on power-up

    Hi,

    Issue remains in kernel 4.18-rc4 using SAPPHIRE RX 550 4GB.

    Logs follow attached.

    Regards,
    Luis

    On Tue, Jun 26, 2018 at 10:08 AM, Luís Mendes
    <luis.p.men...@gmail.com
    <mailto:luis.p.men...@gmail.com><mailto:luis.p.men...@gmail.com
    <mailto:luis.p.men...@gmail.com>>> wrote:
    Hi,

    I've tried kernel 4.18-rc2 on a system with a NVIDIA GTX 1050 Ti
    and an AMD RX 550 4GB and the RX 550 card is failing the IB ring test.

    [    5.033217] [drm:gfx_v8_0_ring_test_ib [amdgpu]] *ERROR*
    amdgpu: ib test failed (scratch(0xC040)=0xFFFFFFFF)
    [    5.033264] [drm:amdgpu_ib_ring_tests [amdgpu]] *ERROR* amdgpu:
    failed testing IB on ring 6 (-22).

    Please see the attached log.

    Regards,
    Luís



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