https://bugzilla.kernel.org/show_bug.cgi?id=106801
Bug ID: 106801
Summary: Lenovo B50-30 Laptop freezes on shutdown
Product: ACPI
Version: 2.5
Kernel Version: 3.19.0-25-generic, 3.16.0-4-686-pae, 3.2.04.686-pae
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Off
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Software requested shutdown process fails to power off the machine as the last
step. It's described here:
http://ubuntuforums.org/showthread.php?t=2285917&page=2&p=13380825 and here
(italian):
http://www.tomshw.it/forum/linux-e-altri-sistemi-operativi/534783-lenovo-b50-30-shutdown-freeze.html
According to various reporters it's due to a bug in the machine BIOS (version
2.08) and fixed by upgrading it to a new one (version 2.11). But the BIOS
upgrade can only be performed by running a Windows .exe file provided by Lenovo
(
http://support.lenovo.com/us/en/products/laptops-and-netbooks/lenovo-b-series-laptops/lenovo-b50-30-notebook/downloads/DS104434
)
Empirically, I found that the kernel shipped with Trisquel 7.0 (
3.13.0-39-lowlatency ) succeeds in making the machine shutdown, so I'm trying
to understand if this is a regression in the kernel or what else.
If I may be of any help with further debugging the issue I'll keep the machine
for that. Otherwise I might return it to the seller as "broken".
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