Bug 236885 - RHEL5: After resume from S3 brightness control doesn't work on Toshiba Portege R200
Summary: RHEL5: After resume from S3 brightness control doesn't work on Toshiba Porteg...
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.0
Hardware: All
OS: Linux
Target Milestone: ---
: ---
Assignee: Prarit Bhargava
QA Contact: Martin Jenner
Depends On:
TreeView+ depends on / blocked
Reported: 2007-04-18 09:12 UTC by Tom G. Christensen
Modified: 2008-07-15 12:16 UTC (History)
4 users (show)

Clone Of:
Last Closed: 2008-07-15 12:16:07 UTC

Attachments (Terms of Use)

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
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):

How reproducible:

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 ...


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.

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