Bug 1128740 - [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness
Summary: [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness
Alias: None
Product: Fedora
Classification: Fedora
Component: linux-firmware
Version: 20
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
Assignee: David Woodhouse
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2014-08-11 13:03 UTC by Paul Lambert
Modified: 2015-06-29 22:01 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2015-06-29 22:01:17 UTC

Attachments (Terms of Use)

Description Paul Lambert 2014-08-11 13:03:11 UTC
Description of problem:  ACPI initial brightness for laptops is not determined for laptops resulting in dmesg log error; [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness

Version-Release number of selected component (if applicable):
Fed 3.15.7-200.fc20.x86_64

How reproducible:
every boot

Steps to Reproduce:

Actual results:

Expected results:

Additional info:
There are several previously reported bugs related to laptop brightness on bootup.  None were resolved.  These as well as my report are all most likely related to the firmware DSDT file not having an entry defined for "method _BQC" The fix for this is documented at this link;

This fix requires decompiling the DSDT file and adding the BQC definition and then recompiling.  This is most likely upstrem kernel task.  Rather than fix just my DSDT firmware configuration this bug needs to be fixed so that anyone with a laptop does not need to go through the same effort of modifying their DSDT file.  Additionally, there are a few other errors in the DSDT configuration that are detailed in this same link and should be addressed as well.

Comment 1 Fedora End Of Life 2015-05-29 12:36:37 UTC
This message is a reminder that Fedora 20 is nearing its end of life.
Approximately 4 (four) weeks from now Fedora will stop maintaining
and issuing updates for Fedora 20. It is Fedora's policy to close all
bug reports from releases that are no longer maintained. At that time
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Comment 2 Fedora End Of Life 2015-06-29 22:01:17 UTC
Fedora 20 changed to end-of-life (EOL) status on 2015-06-23. Fedora 20 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no longer maintained, which means that it will not receive any further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.

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