<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - AMDGPU - Can't even get Xorg to start - Kernel driver hangs with ring buffer timeout on ARM64" href="https://bugs.freedesktop.org/show_bug.cgi?id=108625#c15">Comment # 15</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - AMDGPU - Can't even get Xorg to start - Kernel driver hangs with ring buffer timeout on ARM64" href="https://bugs.freedesktop.org/show_bug.cgi?id=108625">bug 108625</a> from <a class="email" href="mailto:raster@rasterman.com" title="Carsten Haitzler <raster@rasterman.com>"> Carsten Haitzler</a> <pre>And lo and behold: --- ./include/drm/drm_cache.h~ 2018-08-12 21:41:04.000000000 +0100 +++ ./include/drm/drm_cache.h 2018-11-16 11:06:16.976842816 +0000 @@ -48,7 +48,7 @@ #elif defined(CONFIG_MIPS) && defined(CONFIG_CPU_LOONGSON3) return false; #else - return true; + return false; #endif } Makes it work. Of course this isn't a brilliant patch, but indeed there is something up with the way write combined memory is handled on ARM here. but disabling WC for all ARM DRM devices might be too much of a sledgehammer... I'm going to look into a less sledge-hammer solution that might make this work more universally. I'll get back to you on that.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>