Bug 527062 - T61p backlight does not recover
Summary: T61p backlight does not recover
Alias: None
Product: Fedora
Classification: Fedora
Component: hal   
(Show other bugs)
Version: 12
Hardware: x86_64
OS: Linux
Target Milestone: ---
Assignee: Richard Hughes
QA Contact: Fedora Extras Quality Assurance
Keywords: Reopened
Depends On:
TreeView+ depends on / blocked
Reported: 2009-10-03 20:29 UTC by D. E. Evans
Modified: 2010-12-04 07:34 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2010-12-04 07:34:26 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
sleep hook for backlight restore (1.04 KB, application/octet-stream)
2009-10-14 02:27 UTC, D. E. Evans
no flags Details
70.bl sleep hook (1.15 KB, application/octet-stream)
2009-10-25 06:21 UTC, D. E. Evans
no flags Details

Description D. E. Evans 2009-10-03 20:29:34 UTC
Description of problem:
When the T7500 laptop recovers from a screen blank in runlevel 3, the LCP panel backlight remains off.  Backlight works fine--is restored--switching to runlevel 5 with GDM.

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

Comment 1 D. E. Evans 2009-10-12 02:10:09 UTC
If I toggle the value in /proc/acpi/video/VID1/LCD0/brightness to 100 as root (is at 28 after screen blank), this will restore brightness from the console, without launching gdm.  The acpitool program unfortunately looks in the wrong /proc directory for this file.  What is the appropriate method for setting backlight setting persistence on screen blank restore?

PS GDM from runlevel 5 restores brightness, but running startx does not (nor do the two function bright keys work, without GDM).

Comment 2 Richard Hughes 2009-10-12 06:44:37 UTC
You need to use gnome-power-manager, HAL is a mechanism agent, not a policy agent. If you run gdm, gnome-power-manager is run and thus the buttons and policy work. If you don't want to run g-p-m, you can use xfce-power-manager or kpowersave.

Comment 3 D. E. Evans 2009-10-12 23:19:30 UTC
Runlevel 3, not 5.  I want the backlight to work after logging out from the *text* terminal, (i.e I don't want to install the GUI at all: no X).  The point about gdm is that I have to install it and switch to runlevel 5, then the backlight is restored, or if I modify the /proc file system.

Comment 4 Richard Hughes 2009-10-13 09:02:44 UTC
Then you need to add in manually the appropriate command for your laptop in /etc/pm/sleep.d/ for the resume and thaw actions.

HAL is a mechanism agent, not a policy agent. If you want to apply policy then you either have to do it in the kernel and choose sane defaults, or do it in userspace. The way we've chosen to do this in userspace is in the session layer, not the system layer.

Comment 5 D. E. Evans 2009-10-14 02:27:35 UTC
Created attachment 364675 [details]
sleep hook for backlight restore

Oh, I see.  Thank you.  This is a recent (2 months?) change; I'm curious what the change was.  Attached is the hook I added:

Comment 6 D. E. Evans 2009-10-25 06:21:11 UTC
Created attachment 366001 [details]
70.bl sleep hook

attempted sleep hook to restore back light on restore (suspend resume?).

Comment 7 D. E. Evans 2009-10-25 06:28:41 UTC
The attached sleep hook doesn't seem to work.  It is my best attempt at following your advice regarding backlight restoration.  It must be manually run to work, but does not automatically run.  Please pardon my ignorance, but this seems to be a bug with 2.6.30, not a suspend/hibernate policy issue.  What am I missing?  What documentation have I not read that I should have (i.e. pm-utils READMEs, etc.)?  What should I be doing, that I am not, to impliment a policy, instead of an expectation that HAL mechanisms should automatically handle this?

Comment 8 D. E. Evans 2009-11-30 19:53:35 UTC
This issue continues to be present in FC12.  This now occurs whether I'm in runlevel 3 or 5, if I switch to a virtual terminal, and let the screen blank.  The sleep hook previously attached does not execute on recovery (though the nouveau driver now supports suspend when I close the lid).  Recovery requires my running the script manually, or increasing the brightness in GNOME.

Comment 9 D. E. Evans 2010-01-27 17:39:16 UTC
I had thought this issue was specific to runlevel 3, but I just encountered it after a suspend from e16 (runlevel 5, with gdm running). The 70.bl script above had to be run manually to restore brightness.

Comment 10 D. E. Evans 2010-01-27 17:40:07 UTC
s/runlevel 3/the text terminal/

Comment 11 Bug Zapper 2010-11-04 09:40:19 UTC
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'.

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Comment 12 Bug Zapper 2010-12-04 07:34:26 UTC
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 
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