Red Hat Bugzilla – Bug 492458
backlight works only after suspend on Intel KMS
Last modified: 2013-04-02 00:22:41 EDT
Description of problem:
I have Thinkpad T400 with G45 graphics (Intel X4500MHD). Freshly after boot, backlight regulation doesn't work. Echo'ing any values between 0 and 15 to /sys/devices/virtual/backlight/acpi_video0/brightness have no effect on actual backlight, but values in brightness and actual_brightness files are changed.
Keyboard key for changing backlight have no effect, moving slider in GNOME Backlight Applet have no effect.
Additionally, xbacklight reports:
No outputs have backlight property
Curiously, after succesfull suspend-to-ram and resume, it start to work. Keyboard button and backlight applet change brightness. But as STR got very unreliable with F11, I'm reluctant to suspend and resume after each boot.
Version-Release number of selected component (if applicable):
% dmesg | grep -C1 backlig
thinkpad_acpi: radio switch found; radios are enabled
thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
Registered led device: tpacpi::standby
thinkpad_acpi: Standard ACPI backlight interface available, not loading native one.
input: ThinkPad Extra Buttons as /devices/virtual/input/input10
Linux sandworm.fordon.pl.eu.org 2.6.29-9.fc11.x86_64 #1 SMP Thu Mar 26 10:03:10 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
Simiar problem reported here: http://lkml.org/lkml/2009/3/29/53
Can we got newer xorg-x11-drv-intel in rawhide?
xorg-x11-drv-intel-220.127.116.112-1.fc11.x86_64 and the problem still exists.
*** Bug 493376 has been marked as a duplicate of this bug. ***
problem appears to be fixed after today's updates.
Yes, I can confirm that. Thanks for fixing.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
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