Bug 834910 - Screen backlight not functioning after kernel update
Summary: Screen backlight not functioning after kernel update
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 17
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: acpi first=3.4 regression-from=3.3
: 830292 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-06-24 19:52 UTC by Valentin Villenave
Modified: 2012-07-09 08:49 UTC (History)
6 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2012-07-07 21:54:15 UTC
Type: Bug
Embargoed:


Attachments (Terms of Use)
ACPI dump (134.82 KB, text/plain)
2012-06-25 20:22 UTC, Valentin Villenave
no flags Details


Links
System ID Private Priority Status Summary Last Updated
Linux Kernel 43168 0 None None None 2012-06-25 14:20:59 UTC

Description Valentin Villenave 2012-06-24 19:52:09 UTC
Description of problem:

When booting recent kernels (>= 3.4.0) my laptop's screen remains black, the backlight shuts down as soon as the initram image is loaded. No plymouth, no login manager, nothing. Hard drive activity is ordinary and SysReq keys and Alt-Ctrl-Del work, so the O.S. is properly launched even though nothing is visibly displayed.

Version-Release number of selected component (if applicable):

Fedora 17, normal update channels.


How reproducible:

Every boot.


Steps to Reproduce:
1. Yum update, install newer kernel.
2. Reboot.
3. Enjoy the void.

Additional info:

Might be related to other issues such as #752727 or #707688. Except that passing acpi_backlight=vendor or any other boot option doesn't help.

Additionally, my laptop is a Sony VAIO VPC CW1S1E whose screen has been known to be partially unsupported by GNU/Linux (EDID number wrongly recognized). That being said, I had (and still have) no problem booting with kernel 3.3.7, and even backlight-adjustment functions work.

Comment 1 Josh Boyer 2012-06-25 14:20:59 UTC
I believe this is a regression in the ACPI layer.  Can you attach the output of acpidump?

Comment 2 Valentin Villenave 2012-06-25 20:22:45 UTC
Created attachment 594274 [details]
ACPI dump

Here goes.

Comment 3 Josh Boyer 2012-06-26 13:58:55 UTC
OK, this does indeed look like the kernel.org bug I linked to.  Your machine's ACPI lacks _DOS.

I'll try to get a fix committed today.

Comment 4 Josh Boyer 2012-06-26 14:49:30 UTC
Please try this scratch build kernel when it completes:

http://koji.fedoraproject.org/koji/taskinfo?taskID=4196863

Comment 5 Valentin Villenave 2012-06-27 07:24:44 UTC
I tested it several times, and it appears to work. Thanks!

Comment 6 Josh Boyer 2012-07-03 14:25:42 UTC
Thanks for testing.  Fixed in Fedora git.

Comment 7 Fedora Update System 2012-07-05 21:55:41 UTC
kernel-3.4.4-5.fc17 has been submitted as an update for Fedora 17.
https://admin.fedoraproject.org/updates/kernel-3.4.4-5.fc17

Comment 8 Fedora Update System 2012-07-05 23:50:04 UTC
kernel-3.4.4-4.fc16 has been submitted as an update for Fedora 16.
https://admin.fedoraproject.org/updates/kernel-3.4.4-4.fc16

Comment 9 Fedora Update System 2012-07-06 21:23:32 UTC
Package kernel-3.4.4-4.fc16:
* should fix your issue,
* was pushed to the Fedora 16 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing kernel-3.4.4-4.fc16'
as soon as you are able to, then reboot.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2012-10319/kernel-3.4.4-4.fc16
then log in and leave karma (feedback).

Comment 10 Fedora Update System 2012-07-07 21:54:15 UTC
kernel-3.4.4-5.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 Fedora Update System 2012-07-08 20:51:16 UTC
kernel-3.4.4-4.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 Lukáš Tinkl 2012-07-09 08:49:59 UTC
*** Bug 830292 has been marked as a duplicate of this bug. ***


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