Description of problem: When a Lenovo T61 is suspended with Fn+F4 and resumed, the brightness of the internal display is set to its maximum value. Enabling the reset_brightness quirk does not solve this. Version-Release number of selected component (if applicable): pm-utils-0.99.4-6.fc8 hal-info-20071030-1.fc8 How reproducible: always Steps to Reproduce: 1. Set the display brightness to a low value with the Power Management Brightness Applet. 2. Suspend the laptop with Fn+F4. 3. Wake it up with the power button. Actual results: The display brightness is at its maximum. Expected results: The brightness should be the same as before the suspend/resume cycle. Additional info: I modified /usr/share/hal/fdi/information/10freedesktop/20-video-quirk-pm-lenovo.fdi to enable the reset_brightness quirk: <match key="system.hardware.product" prefix="6464"> <merge key="power_management.quirk.s3_bios" type="bool">true</merge> <merge key="power_management.quirk.vbemode_restore" type="bool">true</merge> <merge key="power_management.quirk.reset_brightness" type="bool">true</merge> </match> This did not work. The next thing I tried was to modify /usr/lib/pm-utils/sleep.d/99video, replacing the reset_brightness function with a script: reset_brightness() { /usr/local/sbin/reset-brightness & } The script is attached, and basically does the same as the original reset_brightness function. But it sleeps 1 second before modifying /sys/class/backlight/thinkpad_screen/brightness. This solved the problem. The output of lshal | grep system.hardware is: system.hardware.primary_video.product = 10754 (0x2a02) (int) system.hardware.primary_video.vendor = 32902 (0x8086) (int) system.hardware.product = '6464Y1G' (string) system.hardware.serial = 'L3C5908' (string) system.hardware.uuid = 'A122A181-494A-11CB-A4F5-B04BA82A6D2D' (string) system.hardware.vendor = 'LENOVO' (string) system.hardware.version = 'ThinkPad T61' (string)
Created attachment 290487 [details] script for resetting display brightness on Lenovo T61
Can you test, whether the brightness is also at maximum after you closed the lid and opened it again without suspending?
Yes, the brightness is also at maximum after closing and opening the lid, without suspend. Also, the Fn keys for lowering and raising the brightness don't work. They display an OSD widget with a changing indicator bar, but brightness is always set to maximum. The only way to lower the brightness are echos to /sys or /proc/acpi/ibm, and the Gnome applet.
With the two latest kernels (kernel-2.6.24.3-12.fc8 and kernel-2.6.24.3-34.fc8), the brightness cannot be controlled at all. Instead of /sys/class/backlight/thinkpad_screen/brightness, I now have /sys/class/backlight/acpi_video0/brightness. An echo to the new file takes about one second to complete. While the content of the brightness file changes, the actual brightness does not. The Gnome applet also has stopped working.
With the latest kernel-2.6.24.3-50.fc8, gnome-brightness-applet has started to work again.
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