[Bug 98552] New: RX 480 does not work as eGPU (amdgpu crashes at amdgpu_bo_init)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98552

            Bug ID: 98552
           Summary: RX 480 does not work as eGPU (amdgpu crashes at
                    amdgpu_bo_init)
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: gsedej at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 127690
  --> https://bugs.freedesktop.org/attachment.cgi?id=127690&action=edit
dmesg from crash

I have recently new laptop with i7 4700qm CPU. The nvidia 840m is very slow
even with nvidia driver (I can play new steam linux games at 720p at low to
medium).

My idea is to user "eGPU" solution using RX 480 (external graphics connected to
laptop via expresscard or minipcie)

I prepeared my system - Ubuntu 16.04, kernel 4.9rc3, mesa 13.1 dev

If I start laptop connected to the RX 480, I get blank screen after GRUB, and
can't access it

When I connect GPU while running I can get dmesg using ssh from another
computer.

I am using kernel parameters pci=norcs and pci=realloc



here is probably the problematic part (rest is in the attachment)
[  980.754662]  [<ffffffffa1e705a9>] io_reserve_memtyp+e0x59/0x130
[  980.754688]  [<ffffffffa1e706af>] arch_io_reserve_memtype_wc+0x2f/0x50
[  980.754780]  [<ffffffffc08f3180>] amdgpu_bo_init+0x20/0x90 [amdgpu]
[  980.754835]  [<ffffffffc092cbca>] gmc_v8_0_sw_init+0x37a/0x5a0 [amdgpu]
[  980.754885]  [<ffffffffc08e12a4>] amdgpu_device_init+0xc64/0x11e0 [amdgpu]
[  980.754920]  [<ffffffffa1fd0584>] ? kmalloc_order_trace+0x24/0xa0
[  980.754967]  [<ffffffffc08e39db>] amdgpu_driver_load_kms+0x5b/0x1f0 [amdgpu]
[  980.755028]  [<ffffffffc00a5657>] drm_dev_register+0xa7/0xd0 [drm]
[  980.755069]  [<ffffffffc00a773c>] drm_get_pci_dev+0x9c/0x1c0 [drm]
[  980.755121]  [<ffffffffc08de49c>] amdgpu_pci_probe+0xbc/0xe0 [amdgpu]
[  980.755150]  [<ffffffffa226e415>] local_pci_probe+0x45/0xa0
[  980.755173]  [<ffffffffa226f8c9>] pci_device_probe+0x109/0x160
[  980.755202]  [<ffffffffa2393fd3>] driver_probe_device+0x223/0x430
[  980.755229]  [<ffffffffa23942bf>] __driver_attach+0xdf/0xf0
[  980.755253]  [<ffffffffa23941e0>] ? driver_probe_device+0x430/0x430
[  980.755279]  [<ffffffffa2391b0c>] bus_for_each_dev+0x6c/0xc0
[  980.755306]  [<ffffffffa239371e>] driver_attach+0x1e/0x20
[  980.755330]  [<ffffffffa2393140>] bus_add_driver+0x170/0x270
[  980.755357]  [<ffffffffc0a25000>] ? 0xffffffffc0a25000
[  980.755383]  [<ffffffffa2394c30>] driver_register+0x60/0xe0
[  980.755407]  [<ffffffffc0a25000>] ? 0xffffffffc0a25000
[  980.755432]  [<ffffffffa226dd0c>] __pci_register_driver+0x4c/0x50
[  980.755468]  [<ffffffffc00a794b>] drm_pci_init+0xeb/0x100 [drm]
[  980.755493]  [<ffffffffc0a25000>] ? 0xffffffffc0a25000
[  980.755519]  [<ffffffffc0a25000>] ? 0xffffffffc0a25000
[  980.755566]  [<ffffffffc0a25079>] amdgpu_init+0x79/0x7b [amdgpu]
[  980.755596]  [<ffffffffa1e02190>] do_one_initcall+0x50/0x180
[  980.755624]  [<ffffffffa1ff0201>] ? __vunmap+0x81/0xd0
[  980.755651]  [<ffffffffa200e742>] ? kmem_cache_alloc_trace+0x142/0x190
[  980.755683]  [<ffffffffa1fa3df1>] do_init_module+0x5f/0x1f7
[  980.755707]  [<ffffffffa1f1392b>] load_module+0x199b/0x1d00
[  980.755732]  [<ffffffffa1f10020>] ? __symbol_put+0x60/0x60
[  980.755759]  [<ffffffffa21bcf8e>] ? ima_post_read_file+0x7e/0xa0
[  980.755790]  [<ffffffffa2175edb>] ? security_kernel_post_read_file+0x6b/0x80
[  980.755824]  [<ffffffffa1f13eff>] SYSC_finit_module+0xdf/0x110
[  980.755853]  [<ffffffffa1f13f4e>] SyS_finit_module+0xe/0x10
[  980.755878]  [<ffffffffa268bbbb>] entry_SYSCALL_64_fastpath+0x1e/0xad

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