[Bug 115141] radeon kernel module hangs suspend

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https://bugzilla.kernel.org/show_bug.cgi?id=115141

Eugene Shalygin <eugene.shalygin@xxxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |eugene.shalygin@xxxxxxxxx

--- Comment #1 from Eugene Shalygin <eugene.shalygin@xxxxxxxxx> ---
Have the same problem with radeon module and
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Neptune XT [Radeon HD 8970M] (prog-if 00 [VGA controller])
        Subsystem: CLEVO/KAPOK Computer Neptune XT [Radeon HD 8970M]
        Flags: bus master, fast devsel, latency 0, IRQ 34
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Memory at f7b00000 (64-bit, non-prefetchable) [size=256K]
        I/O ports at e000 [size=256]
        Expansion ROM at f7b40000 [disabled] [size=128K]
        Capabilities: [48] Vendor Specific Information: Len=08 <?>
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
        Capabilities: [150] Advanced Error Reporting
        Capabilities: [270] #19
        Capabilities: [2b0] Address Translation Service (ATS)
        Capabilities: [2c0] Page Request Interface (PRI)
        Capabilities: [2d0] Process Address Space ID (PASID)
        Kernel driver in use: radeon
        Kernel modules: radeon
Blacklisting radeon makes suspend work. I use custom build kernel in Gentoo.
For me this is a regression from 4.4, where the same config worked.
Additionally (might be related?) in 4.5 external radeon card does not switch
off automatically when not used, I have now to
echo 'auto' > '/sys/bus/pci/devices/0000:01:00.0/power/control'
to turn it off.
BTW, When it is turned off, lspci shows:
# lspci -s 01:00 -v
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Neptune XT [Radeon HD 8970M] (rev ff) (prog-if ff)
        !!! Unknown header type 7f
        Kernel driver in use: radeon
        Kernel modules: radeon

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