Openmoko Bug #2262: backlight brightness of 11 unusable after blank/unblank

Openmoko Public Trac bugs at
Sat Mar 28 13:31:25 CET 2009

#2262: backlight brightness of 11 unusable after blank/unblank
 Reporter:  lindi            |          Owner:  openmoko-kernel
     Type:  defect           |         Status:  new            
 Priority:  normal           |      Milestone:                 
Component:  System Software  |        Version:  unspecified    
 Severity:  normal           |       Keywords:                 
 Haspatch:  0                |      Blockedby:                 
Estimated:                   |    Patchreview:                 
 Blocking:                   |   Reproducible:                 
 Steps to reproduce:
 1) run Xorg
 2) sudo sh -c 'echo 11 > /sys/class/backlight/gta02-bl/brightness'
 3) xset s 10
 4) sleep 10
 5) xset s reset

 Expected results:
 If screen is readable after 2) then it is also readable after 5)

 Actual results:
 Screen is readable (although very dim) after 2) but completely blank after

 More info:
 1) Setting backlight brithness to 12 or higher does not seem to cause this
 2) This bug also occurs with Xglamo
 3) If you wonder why this is a problem: I was using FR in a car at night
 and wanted to use very dim display so that I don't disturb the driver.
 After the screensaver hit blanked the display I was forced to remove the
 battery to get the phone back to a usable state since using touchscreen
 blindly to increase backlight brightness was quite  impossible and error-
 prone in my case.

 kernel: Linux ginger 2.6.28-GTA02_lindi-andy-
 tracking_b8b36e5ec3db71d5-mokodev #53 PREEMPT Sun Feb 22 13:08:50 UTC 2009
 armv4tl GNU/Linux
 kernel cmdline: rootfstype=jffs2 root=/dev/mtdblock6
 console=ttySAC2,115200 console=tty0 loglevel=8 regular_boot mtdparts
 rootfstype=ext2 root=/dev/mmcblk0p2 rootdelay=5 panic=10 mem=127M
 u-boot: U-Boot 1.3.2+gitr46+dc633f4be2527f844158aa5085c278b0c3039d3f (Aug
 8 2008 - 03:58:49)
 hardware revision:  0350
 xserver-xorg-core: 2:
 xf86-video-glamo: 703acea1

Ticket URL: <> <>
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