Re: linux-firmware-i915 pull request (bxt dmc, kbl dmc)

[David Weinehall <david.weinehall@linux.intel.com>]

On Wed, Aug 03, 2016 at 03:48:02PM +0000, Vivi, Rodrigo wrote:
> On Wed, 2016-08-03 at 17:26 +0200, Daniel Vetter wrote:
> > On Wed, Aug 3, 2016 at 5:12 PM, Vivi, Rodrigo <rodrigo.vivi@intel.com
> > > wrote:
> > > 
> > > 
> > > But we know that 1.23 is bad and cause issues regardless the kernel
> > > version. And please keep in mind this is the most common case.
> > > Usually a previous minor version was dropped in favor of a new one
> > > because we found a bug that got fixed in a following minor version.
> > > This is the minor version idea. So regardless the kernel version,
> > > the
> > > newest minor is probably safest than the previous one.
> > > 
> > > So, I don't want to keep all versions in linux-firmware.git,
> > > specially
> > > those that we know that cause bad issues.
> > > 
> > > And here is the case were only symbolic link would help imho.
> > If a system goes from "mostly works" to "fails because DMC isn't
> > there
> > any more" then that's a regression. Which means we _must_ resstore
> > 1.23.
> 
> From what I can remember it causes GPU Hangs depending on what you are
> running on the GPU.

Sounds like we should submit a fix to stable that makes the minimum
required version 1.26 if that's indeed the case. I wonder if this
the cause of all the hangs I've seen on my Skylake laptop lately;
I have both 1.23 and 1.26 installed, so I hadn't noticed that it's
loading 1.23 instead of 1.26.


Kind regards, David Weinehall
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