Bug 521746

Summary:	kernel boot hangs on ThinkPad X61 (Intel i915 graphics)
Product:	[Fedora] Fedora	Reporter:	Ben Liblit <liblit>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED NEXTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	low
Version:	11	CC:	demobird43, itamar, kernel-maint, vedran
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
URL:	http://www.smolts.org/client/show/pub_c225b7f6-a99b-4c48-94f0-3f2ada58be15
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2009-10-27 10:05:48 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Ben Liblit 2009-09-08 05:50:01 UTC

kernel-2.6.30.5-43.fc11.i586 hangs during boot on my ThinkPad X61 laptop. The same problem appeared in all kernel-2.6.29.6-* releases as well. The last kernel which booted successfully was kernel-2.6.29.4-167.fc11.i586. I did not try any kernel-2.6.29.5-* release, so all I can say is that something broke between kernel-2.6.29.4 and kernel-2.6.29.6.

If I remove "quiet rhgb" from the kernel command line to try to see where it is hanging, I see various text stream by and then the display changes resolution and is cleared. At this point it hangs, showing only a blinking text cursor on the screen.

If I remove "quiet rhgb" and also add "i915.modeset=0" to the kernel command line, then I can see that the following were the last lines printed before the hang:

input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/device:02/input/input6
ACPI: Video Device [VID] (multi-head: yes rom: no post: no)
[drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0

Searching for this in the dmesg output of a successful boot, I can see that the next text that *would* have appeared would probably be:

kjournald starting. Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.

Hopefully that gives a narrow-enough interval to help diagnose what went wrong. Personally, I suspect something video-related, but that might be a red herring.

Incidentally, once booting hangs, the kernel is not completely dead. It is still alive enough to respond to Control-Alt-Delete by printing the following messages before rebooting:

md: stopping all md devices.
sd 0:0:0:0: [sda] Synchronizing SCSI cache
Restarting system.
machine restart

Comment 1 Ben Liblit 2009-09-08 05:57:35 UTC

URL field set to the affected machine's smolt profile, in case more hardware details are needed.

Comment 2 Daisuke Tonoki 2009-09-09 04:14:57 UTC

I maybe have same problem on ThinkPad X300.
Do you use PAE kernel?
My simple workaround is that, do not use kernel-PAE.

drm-intel-gem-use-dma32-on-pae.patch

Comment 3 Ben Liblit 2009-09-09 17:04:35 UTC

No, I am not using the PAE kernel.

Comment 4 Vedran Miletić 2009-10-26 11:31:16 UTC

Can you retry with Fedora 12 Beta LiveCD?

Comment 5 Ben Liblit 2009-10-27 02:14:29 UTC

Fedora 12 Beta works fine.

Strictly speaking, I did not use a LiveCD, as the X61 model has no optical drive.  I used liveusb-creator to build a bootable Fedora 12 Beta Live USB flash drive, which worked perfectly.

Comment 6 Vedran Miletić 2009-10-27 10:05:48 UTC

Oh, of course. I forgot to check that. But it should be equivalent in some way.

Thanks for reporting back. Apparently it will be fixed when Fedora 12 comes out.