ACK/cmnt / APPLIED[C/Unstable]: [SRU] [Bionic/Cosmic/Unstable] [PATCH 0/1] Fix unusable NVIDIA GPU after S3

[Seth Forshee]

On Wed, Sep 19, 2018 at 11:29:15PM +0800, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1793338
> 
> [Impact]
> NVIDIA GPU on a new system we have becomes unusable after S3.
> 
> [Test]
> The NVIDIA GPU in question works well after applying this patch.
> 
> [Fix]
> Rewrite 0 to Intel PCI bridge 'Prefetchable Base Upper 32 Bits'.
> This should be done by BIOS S3 code [1], but now the issue reappears, let's
> do the same in Linux PCI subsystem.
> 
> [Regression Potential]
> Low.
> After applying this patch I haven't noticed any change on already
> working PCI devices.
> Also this patch is acked by PCI and ACPI maintainers, so we can be more
> confident.
> 
> [1] https://bugzilla.kernel.org/show_bug.cgi?id=116851#c23

I think this looks safe enough, though based on the branch it's been
committed to and the discussion it's not entirely clear to me whether
this patch will go upstream or something a little different. So I think
we can apply it, but I'd ask that you keep an eye on the upstream
discussions and send an update if upstream goes a different way.

Based on the above I think this should be committed as SAUCE. With that
done:

Acked-by: Seth Forshee <seth.forshee at canonical.com>

Applied to cosmic/master-next and unstable/master. Thanks!