Red Hat Bugzilla – Bug 236885
RHEL5: After resume from S3 brightness control doesn't work on Toshiba Portege R200
Last modified: 2008-07-15 08:16:07 EDT
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):
Steps to Reproduce:
1. Press Fn-F3 or run pm-suspend
2. Press powerbutton to resume
Actual brightness is set very low even though /proc/acpi/toshiba/lcd shows the
same values as before suspending.
Actual brightness reflects the value of /proc/acpi/toshiba/lcd instead of being
R200 has the i915 chipset.
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 ...
I'm closing this BZ out as CANTFIX. We do not have HW to test with.