=sys-kernel/mips-sources-4.19.79.ip28 For the upcoming xf86-video-impact driver, a new sysctl function is needed in the impact fbdev in the kernel, to efficiently handle multi area DMA flushes on the non-cache-coherent architecture of IP28 (SGI Indigo2 Impact 10000). https://gitlab.freedesktop.org/xorg/driver/xf86-video-impact/-/merge_requests/1 Without this patch, the xf86-video-impact driver falls back to PIO mode, which is slow. For the patch to work, bug 710678 filed patch as a prerequisite is assumed. Reproducible: Always
Created attachment 617538 [details, diff] The patch