On Wed, 12 Jan 2011 14:31:33 -0800 Linus Torvalds torvalds@linux-foundation.org wrote:
On Wed, Jan 12, 2011 at 2:22 PM, Jesse Barnes jbarnes@virtuousgeek.org wrote:
Ah, ok. So it could be our internal FDI link is underrunning; it goes between the CPU and PCH and carries display bits.
I'm not sure it's an underrun or anything like that: the corruption is long-term in the non-video case. So I take back the "looks like memory bandwidth problems", because it really looks more like a corrupted blit operation there.
Ah ok if it's long running then yeah it's more likely to be a rendering issue. It could also be the FDI link getting its timings messed up though, and consistently delivering the wrong bits; that could show up in the same place on the screen each time, or it might move in a pattern across the screen (usually from top to bottom).
Will do. I'll have to reboot to the broken kernel (my bisection ended in a non-broken case)
Great, thanks.