https://bugzilla.kernel.org/show_bug.cgi?id=192161
Bug ID: 192161 Summary: Amdgpu UVD init failures at boot Product: Drivers Version: 2.5 Kernel Version: 4.10-rc2 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: blocking Priority: P1 Component: Video(DRI - non Intel) Assignee: drivers_video-dri@kernel-bugs.osdl.org Reporter: fin4478@hotmail.com Regression: No
Created attachment 250851 --> https://bugzilla.kernel.org/attachment.cgi?id=250851&action=edit A8-7600 dmesg (full)
UVD init fails at boot and and X server starting stops. Terminal works but rebooting is impossible because of lightdm has hanged. Hardware: Amd A8-7600 APU, Gigabyte F2A88XM-DS2 motherboard, single 4GB ddr3 2133Mhz ram stick. OS: Debian testing Xfce.
When using X4 845 and RX460 I have same UVD errors at boot, but X starts ok and the computer works ok.
Adding _netdev to /etc/fstab home partition mount options helps to start X with A8-7600 (errors still present at boot and shutdown) and with X4 845 and RX460 removes UVD errors completely. Setting #define AMD_MAX_USEC_TIMEOUT to 100 ms is better value for A8-7600 than 200 ms because 100ms value enables X to start, see drivers/gpu/drm/amd/include/amd_shared.h.
The same problem is with agd5f/linux/log/drivers/gpu/drm/amd?h=drm-next-4.10-wip kernel that is in 4.9-rc8 now. When it it was in version 4.9-rc2 the driver did work fine in both computers. With A8-7600 pc we need to use the stock Debian kernel 4.8 radeon kernel driver now.