Bug 294387

Summary:	dev-libs/glib-2.22.2 black screen lockup on start
Product:	Gentoo Linux	Reporter:	Keean Schupke <keean>
Component:	[OLD] GNOME	Assignee:	Gentoo Linux Gnome Desktop Team <gnome>
Status:	RESOLVED DUPLICATE
Severity:	critical
Priority:	High
Version:	unspecified
Hardware:	AMD64
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Keean Schupke 2009-11-24 10:10:25 UTC

glib crashes on start leaving you with a black screen and mouse pointer, cannot use ctrl-alt-Fn or ctrl-alt-del. This happens when compiling with -O3. I realise this is an upstream problem, but a rev of the ebuild with a filter/replace on -O3 to -O2 would be sensible.

Reproducible: Always

Steps to Reproduce:
1. Set -O3 in make.conf CFLAGS
2. emerge -1 glib
3. /etc/init.d/xdm start (with gdm selected in /etc/conf.d/xdm)

Actual Results:  
Blank screen with mouse pointer, unresponsive system. May be able to login with ssh and kill, but occasionally crashes system requiring reset.

Expected Results:  
gdm login screen appears with dialog, and able to use.

I understand optimisation problems should be referred upstream, but as this causes a hang, it would seem sensible to replace the CFLAGS -O3 with -O2 until -O3 is working with glib again.

-O3 is useful on core2/nehalem CPUs as it enables auto-vectorisation, which with the faster SSE units on core2 can make a big speed difference by using parallel SSE instructions.

As per package CFLAGS are not supported, filtering the -O3 useflag on packages that are broken by optimisation would seem the only option, other than slowing down all packages (video encoding, scientific, etc...).

Comment 1 Gilles Dartiguelongue (RETIRED) gentoo-dev

2009-11-24 10:38:38 UTC


*** This bug has been marked as a duplicate of bug 294385 ***