Bug 236885

Summary:	RHEL5: After resume from S3 brightness control doesn't work on Toshiba Portege R200
Product:	Red Hat Enterprise Linux 5	Reporter:	Tom G. Christensen <tgc>
Component:	kernel	Assignee:	Prarit Bhargava <prarit>
Status:	CLOSED CANTFIX	QA Contact:	Martin Jenner <mjenner>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0	CC:	bmaly, jmoyer, peterm, rpacheco
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-07-15 12:16:07 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tom G. Christensen 2007-04-18 09:12:00 UTC

Description of problem:
When resuming from suspend-to-ram on a Toshiba Portege R200 the brightness is
set very low.
Looking in /proc/acpi/toshiba/lcd shows the same brighness level as before
suspending so preservation of the brightness level would seem to work but has no
effect.
Any attempt to raise or lower the brightness using echo "brightness: <value>" >
/proc/acpi/toshiba/lcd has no effect after a resume.

Adjusting brightness works as expected before a suspend.

Version-Release number of selected component (if applicable):
2.6.18-8.1.1.el5

How reproducible:
100%

Steps to Reproduce:
1. Press Fn-F3 or run pm-suspend
2. Press powerbutton to resume
  
Actual results:
Actual brightness is set very low even though /proc/acpi/toshiba/lcd shows the
same values as before suspending.

Expected results:
Actual brightness reflects the value of /proc/acpi/toshiba/lcd instead of being
very low.

Additional info:
R200 has the i915 chipset.

Comment 5 Prarit Bhargava 2007-06-11 14:09:49 UTC

Doesn't appear to be a generic i915 chipset issue.  I've borrowed a laptop from
jmoyer here (which has the i915) and the display works after suspend-to-ram.

I'll try to hunt down a toshiba laptop ...

P.

Comment 6 Prarit Bhargava 2008-07-15 12:16:07 UTC

I'm closing this BZ out as CANTFIX.  We do not have HW to test with.