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

[Openmoko Public Trac]

#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
 5).

 More info:
 1) Setting backlight brithness to 12 or higher does not seem to cause this
 bug.
 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
 =physmap-
 flash:-(nor);neo1973-nand:0x00040000(u-boot),0x00040000(u-boot_env),0x00800000(kernel),0x000a0000(splash),0x00040000(factory),0x0f6a0000(rootfs)
 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)
 xglamo: 1.3.0.0+git20080807-3
 hardware revision:  0350
 xserver-xorg-core: 2:1.5.99.902-1
 xf86-video-glamo: 703acea1
 }}}

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2262>
docs.openmoko.org <http://docs.openmoko.org/trac/>
openmoko trac