On Mon, 2014-12-15 at 16:11 -0500, Valdis.Kletnieks@xxxxxx wrote: > On Mon, 15 Dec 2014 14:19:32 -0600, Chris said: > > On Mon, 2014-12-15 at 13:43 -0500, Valdis.Kletnieks@xxxxxx wrote: > > > > I'm pretty sure that's a timer for the i915 driver that detects if the > > > GPU has gone into an infinite loop due to (usually) buggy programming from > > > the operating system.... > > > > Thank you Valdis as far as the OS we're talking about Ubuntu not the > > bios correct? > > More specifically, the i915 is actually a fully programmable CPU in its own > right, but it's a crazy morass of interrupts and circular buggers > and race conditions. The operating system (Ubuntu or what have you) actually > send the i915 a program of what to display, and the i915 goes off and does it. > Of course, missing a single interrupt or an off-by-one error in a circular > buffer will cause the i915 to go off the rails and usually get hung in a hard > loop. > > (It doesn't help that the i915 has a ton of wonky restrictions of the form "you > can do this during a vertical retrace period, but only during the first half > of a horizontal retrace". And yes, I'm pretty sure it actually enforces > vertical and horizontal retrace timings on LCDs. Silly, huh? ;) I believe I understand Valdis, what kind of actions would need to be taken to track this down, if it's possible, or to simply fix the problem once and for all? -- Chris KeyID 0xE372A7DA98E6705C 31.11°N 97.89°W (Elev. 1092 ft) 15:16:18 up 3:21, 3 users, load average: 0.17, 0.19, 0.18 Ubuntu 14.04.1 LTS, kernel 3.13.0-43-generic _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
