Red Hat Bugzilla – Bug 550645
Lenovo IdeaPad U350 : thinkpad-acpi are not loaded
Last modified: 2010-12-03 20:12:29 EST
Description of problem:
After system install is not possible to set the screen backlight. System do nothing. Modprobe thinkpad-acpi cant be loaded (no such device).
The is also no way to control the power or fan speed.
Version-Release number of selected component (if applicable):
Install F12 on Lenovo IdeaPad U350
Steps to Reproduce:
Totally not working
thinkpad-acpi will be loaded, or as minimum, screen brightness can be configured
This is clearly not a bwidget bug. Reassigning to the proper component.
This message is a reminder that Fedora 12 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 12. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
this bug will be closed as WONTFIX if it remains open with a Fedora
'version' of '12'.
Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version'
to a later Fedora version prior to Fedora 12's end of life.
Bug Reporter: Thank you for reporting this issue and we are sorry that
we may not be able to fix it before Fedora 12 is end of life. If you
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Although we aim to fix as many bugs as possible during every release's
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The process we are following is described here:
This problem is in Fedora13 and also in new Fedora 14.
This has nothing to do with thinkpad-acpi.
I believe the problem is that once KMS is active, the ACPI no longer controls the backlight of the laptop. The workaround is to issue:
$ sudo setpci -s 00:02.0 F4.B=5F
Replace 00:02.0 with whatever PCI address your graphics card actually lives on (see output from lspci).
This should be fixed in 2.6.36.
Fedora 12 changed to end-of-life (EOL) status on 2010-12-02. Fedora 12 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.
If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version.
Thank you for reporting this bug and we are sorry it could not be fixed.