On Fri, 21 Jun 2013 23:58:08 -0700 Guenter Roeck linux@roeck-us.net wrote:
Hi all,
after upgrading one of my servers to 3.8, then 3.9.7 and 3.10-rc6, I started to see lots of "Timed out waiting for forcewake old ack to clear" error messages, including hang-ups especially if the system was highly loaded. With 3.5.24 everything was fine.
After backing out commit 36ec8f877 (drm/i915: unconditionally use mt forcewake on hsw/ivb), everything is back to normal. The log message is still there, but only once during boot, and the system runs stable.
CPU is "Intel(R) Core(TM) i7-3770K CPU @ 3.50GHz", mainboard is Supermicro C7H61, BIOS version 2.00 dated 11/02/2012. Configuration file is whatever comes with Ubuntu; I'll be happy to provide a copy if anyone thinks it might help.
Any idea what else I can do besides using a special kernel with the backed out commit ? Is it possible that others have the same problem ?
Ouch, so a BIOS that uses the other forcewake mechanism seems to have escaped. Is there a newer one available for your system? I'm hoping it'll fix the issue, otherwise we may have to introduce both methods for IVB again...