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@kernel-bugs.osdl.org Reporter: arugeo1@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.