Bug 607636

Summary:	sys-kernel/gentoo-sources-4.9.6 xorg hangs on startup with nouveau on optimus systems
Product:	Gentoo Linux	Reporter:	Gleb <kirokko+gentoo>
Component:	Current packages	Assignee:	Gentoo Kernel Bug Wranglers and Kernel Maintainers <kernel>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:
Bug Blocks:	607508

Description Gleb 2017-01-29 16:35:14 UTC

Original discussion is here: https://bugs.gentoo.org/show_bug.cgi?id=607508

TL;DR: Since 4.9 xorg hangs with the following conditions:
- optimus laptop
- nouveau driver / kernel module
- runpm enabled (which is the default state)

BUG: https://bugs.freedesktop.org/show_bug.cgi?id=98690
PATCH (from 4.10 tree): https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=68f458eec7069d618a6c884ca007426e0cea411b
PATCH (direct link): https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/?id=68f458eec7069d618a6c884ca007426e0cea411b

Answering the question by Mike Pagano:
> Does the patch apply to 4.9 cleanly and fix the issue?
Yes, patch applies and fixes the issue.
Without patch system fails to boot, xorg hangs.

Comment 1 Alice Ferrazzi Gentoo Infrastructure

2017-01-30 05:22:09 UTC

could you try to use =sys-kernel/gentoo-sources-4.9.6-r1
and see if is working ?

Comment 2 Gleb 2017-01-30 13:43:45 UTC

Built the kernel, boots and works without any issues.

Comment 3 Agostino Sarubbo gentoo-dev

2017-01-30 15:58:35 UTC

Thanks for the feedback

Comment 4 Gleb 2017-02-01 15:17:28 UTC

Please note that the patch is now in 4.9.7:
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=2abb7f408f7cfb9af9218e74507f5f44af154302