[Bug 1791569] Re: some nvidia p1000 graphic cards hang during the boot

** Changed in: hwe-next
Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1791569

Title:
some nvidia p1000 graphic cards hang during the boot

Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem package in Ubuntu:
Fix Released
Status in linux source package in Bionic:
Fix Released
Status in linux-oem source package in Bionic:
Fix Released

Bug description:

BugLink: https://bugs.launchpad.net/bugs/1791569

This patch is in the 4.18 already, no need to send it to cosmic.

Due to the context conflict, if we want to apply this patch as it is, we
need to apply a large amount of patches ahead of this patch, it is possible
to introduce some regression. So I made some change in this patch, it is
some differnt from the orignal patch, but they have the same logic, and it
can be applied to bionic kernel.

[Impact]
We have 2 nvidia graphic cards, and the nouveau driver in the bionic kernel can't
work well with both of these 2 cards, one of the cards hang during the boot
process, we compared the output of lspci and vbios version of these 2 cards, they
are same; and according to nivida's reply, it is possible that they have some
difference on computational units (https://devtalk.nvidia.com/default/topic/1038973/
linux/2-same-quadro-p1000-cards-but-only-one-can-install-ubuntu-/), and kernel-4.18
fixed this problem, through bisect, this patch was found.

[Fix]
backport a upstream patch to fix this problem. without this patch, the number of tpc
(texture process cluster) is hardcoded to be 5 for some nv graphic families, but
in practice, the tpc number of many families is not 5. And the p1000 grphic card belong
to gp107 family, it is 3 intead of 5.


[Test Case]
tested this patch with P1000, P2000, P620 and P500 graphic cards, all work well as before.

[Regression Potential]
Very low, this patch comes from upstream, and I have tested it with many nv graphic
cards, they all worked well as before.

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