https://bugzilla.kernel.org/show_bug.cgi?id=61721
Bug ID: 61721
Summary: Sony Vaio Z (VPCZ1, 2010) power off / reboot is very
slow unless I pass 'reboot=pci'
Product: ACPI
Version: 2.5
Kernel Version: 3.10
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Off
Assignee: [email protected]
Reporter: [email protected]
Regression: No
One of my systems is a Sony Vaio Z, the 2010 model often referred to as VPC-Z1
or VPCZ1. I don't know precisely when this started - some months ago - but at
some point, system shutdown / reboot became very slow.
It's not a systemd-level issue, the shutdown process gets beyond the systemd
level. I see:
Rebooting.
[timestamp] mei_me 0000:00:16.0: stop
[timestamp] Restarting system.
(or equivalent messages for a shut down), and *then* it sticks, for about one
or two minutes before finally actually shutting down/rebooting. This is very
late in the shutdown process AIUI.
Thanks to a tip from Dave Airlie, I tried 'reboot=bios', 'reboot=acpi' and
'reboot=pci' parameters. With both 'bios' and 'acpi' the shutdown remains slow,
but 'pci' seems to fix the problem: I get fast shutdowns again!
I'm assuming this 'ought to' work without the user having to pass a magic
kernel parameter; it used to. Please let me know what further info is needed, I
really don't know what to include. I'm fairly sure I've been seeing this since
at least 3.8, but it was probably earlier than that. Current kernel on the
affected box is 3.10.12; I can quite easily try a 3.11 kernel if necessary,
trying 3.12 may be a bit harder.
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