[Bug 91371] New: UVD not responding error during UVD initialization for AMD 7670M graphics

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=91371

            Bug ID: 91371
           Summary: UVD not responding error during UVD initialization for
                    AMD 7670M graphics
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: arugeo1 at gmail.com
        Regression: No

Created attachment 163551
  --> https://bugzilla.kernel.org/attachment.cgi?id=163551&action=edit
dmesg

My Linux Kernel version is 3.16.7 .My System is a HP Pavillion g6 laptop with
AMD A8-4500M APU with 7640G + 7670M Dual Graphics.On booting Manjaro (and
Ubuntu) distro i get these errors and display blinks before and after showing
them. 

[   26.971983] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   27.992402] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   29.012898] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   30.033439] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   31.053953] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   32.074424] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   33.094895] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   34.115369] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   35.135841] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   36.156319] [drm:uvd_v1_0_start] *ERROR* UVD not responding, trying to reset
the VCPU!!!
[   36.176381] [drm:uvd_v1_0_start] *ERROR* UVD not responding, giving up!!!
[   36.176432] [drm:evergreen_startup] *ERROR* radeon: error initializing UVD
(-1).
[   37.611579] [drm:radeon_acpi_init] *ERROR* Cannot find a backlight
controller

I found some cards reported having these errors earlier in 3.13 kernel but it
was found to be fixed in 3.15 (dont know if this is a reccurence of that bug).
The UVD initialization for integrated card seems to be fine while UVD fails for
Dedicated card.Currently the problems faced due to this are that booting
succeeds randomly(sometimes it gives a black screen sometimes it gets stuck
before login screen) and when it does the booting time is high.

It also shows these errors during shutdown.I tried to turn off dpm ,but that
gave me a blank screen(and not able to load X).I tried other kernels and it
persists in 3.17 and 3.18 kernels.

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