Control: tag -1 upstream Control: forwarded -1 https://devtalk.nvidia.com/default/topic/1068045/linux/5-4-kernel-breaks-prime-synchronization-/
On 10/01/2020 10.37, Raphaël Hertzog wrote: > We had multiple reports of nvidia users having refresh issues ever since > they switched to Linux 5.4. > > I believe they are affected by the loss of "PRIME synchronization" as > explained in > https://devtalk.nvidia.com/default/topic/1068045/linux/5-4-kernel-breaks-prime-synchronization-/ Luca, can you reproduce something like that? > There's a patch for 440.44 in that thread but I don't know of any upstream > fix. Direct link to patch: https://gitlab.com/snippets/1927096 That patch looks like a crude hack. I have no clue what its intention is. The only thing I understood for sure is that it abuses the NV_DRM_DRIVER_HAS_GEM_PRIME_RES_OBJ condition, probably by turning it into "true". It's also not backwards compatible. I'm not going to apply it in the current shape. :-( Andreas
