<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [drm:.r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD)" href="https://bugs.freedesktop.org/show_bug.cgi?id=95015#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [drm:.r600_ring_test [radeon]] *ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD)" href="https://bugs.freedesktop.org/show_bug.cgi?id=95015">bug 95015</a> from <a class="email" href="mailto:jjcogliati-r1@yahoo.com" title="Joshua Cogliati <jjcogliati-r1@yahoo.com>"> Joshua Cogliati</a> <pre>Just for reference, this error comes from the line: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/radeon/r600.c#n2848">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/radeon/r600.c#n2848</a> Basically, the r600 driver writes 0xCAFEDEAD into a scratch register, then uses a ring write to try and write 0xDEADBEEF into the scratch register, and then waits and then reads the scratch register again to see what is in it. If it is not 0xDEADBEEF, then the test fails and hardware acceleration is turned off. The important question is why is the ring write failing, and I don't have an answer.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>