为什么mt6572开机调节背光亮度异常
时间：10-02
整理：3721RD
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在刚开机的时候调节背光亮度，先降到最低，然后恢复默认值255?kernel log 如下
<0>[ 55.072402] (0)[585:powerManagerSer][LED]Set Backlight directly 30 at time 4294942802
<4>[ 55.072431] (0)[585:PowerManagerSer]mt65xx_leds_set_cust: set brightness, name:LCD-backlight, mode:3, level:30
<0>[ 55.072450] (0)[585:PowerManagerSer][LED]PMIC#2:30
<0>[ 55.072463] (0)[585:PowerManagerSer][LED]Level Mapping = 13
<0>[ 55.072476] (0)[585:PowerManagerSer][LED]ISINK DIM Duty = 6
<0>[ 55.072488] (0)[585:PowerManagerSer][LED]ISINK Current = 1
<5>[ 55.075127] (0)[0:swapper/0][Power/Battery] ******** battery : bat_thread_wakeup ********
<5>[ 55.075212] (0)[45:bat_thread_kthr][Power/Battery] [upmu_is_chr_det] Charger exist and USB is not host
<5>[ 55.075237] (0)[45:bat_thread_kthr][Power/Battery] [BAT_thread]Cable in, CHR_Type_num=1
<5>[ 55.075605] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17825.
<5>[ 55.075628] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17825, adc_result=3916, r_val_temp=4.
<5>[ 55.076005] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17404.
<5>[ 55.076028] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17404, adc_result=3824, r_val_temp=4.
<5>[ 55.076393] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17824.
<5>[ 55.076415] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17824, adc_result=3916, r_val_temp=4.
<5>[ 55.076780] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17401.
<5>[ 55.076800] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17401, adc_result=3823, r_val_temp=4.
<5>[ 55.077164] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17827.
<5>[ 55.077185] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17827, adc_result=3917, r_val_temp=4.
<5>[ 55.077546] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17403.
<5>[ 55.077566] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17403, adc_result=3823, r_val_temp=4.
<5>[ 55.077929] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17833.
<5>[ 55.077949] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17833, adc_result=3918, r_val_temp=4.
<5>[ 55.078311] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17411.
<5>[ 55.078332] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17411, adc_result=3825, r_val_temp=4.
<5>[ 55.078695] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17834.
<5>[ 55.078716] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17834, adc_result=3918, r_val_temp=4.
<5>[ 55.079091] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17408.
<5>[ 55.079114] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17408, adc_result=3825, r_val_temp=4.
<5>[ 55.079490] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17831.
<5>[ 55.079511] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17831, adc_result=3917, r_val_temp=4.
<5>[ 55.080184] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17409.
<5>[ 55.080210] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17409, adc_result=3825, r_val_temp=4.
<5>[ 55.080575] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17838.
<5>[ 55.080596] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17838, adc_result=3919, r_val_temp=4.
<5>[ 55.082468] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17377.
<5>[ 55.082503] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17377, adc_result=3818, r_val_temp=4.
<5>[ 55.083030] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17812.
<5>[ 55.083059] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17812, adc_result=3913, r_val_temp=4.
<5>[ 55.083648] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17401.
<5>[ 55.083676] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17401, adc_result=3823, r_val_temp=4.
<5>[ 55.084270] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17802.
<5>[ 55.084297] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17802, adc_result=3911, r_val_temp=4.
<5>[ 55.084876] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17379.
<5>[ 55.084905] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17379, adc_result=3818, r_val_temp=4.
<5>[ 55.085286] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17827.
<5>[ 55.085309] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17827, adc_result=3917, r_val_temp=4.
<5>[ 55.086547] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17358.
<0>[ 55.087569] (0)[585:PowerManagerSer][LED]Set Backlight directly 255 at time 4294942803
<4>[ 55.087598] (0)[585:PowerManagerSer]mt65xx_leds_set_cust: set brightness, name:lcd-backlight, mode:3, level:255
<0>[ 55.087618] (0)[585:PowerManagerSer][LED]PMIC#2:255
<0>[ 55.087633] (0)[585:PowerManagerSer][LED]Level Mapping = 108
<0>[ 55.087645] (0)[585:PowerManagerSer][LED]ISINK DIM Duty = 31
<0>[ 55.087657] (0)[585:PowerManagerSer][LED]ISINK Current = 5
好奇怪?哪个大神解决一下
<0>[ 55.072402] (0)[585:powerManagerSer][LED]Set Backlight directly 30 at time 4294942802
<4>[ 55.072431] (0)[585:PowerManagerSer]mt65xx_leds_set_cust: set brightness, name:LCD-backlight, mode:3, level:30
<0>[ 55.072450] (0)[585:PowerManagerSer][LED]PMIC#2:30
<0>[ 55.072463] (0)[585:PowerManagerSer][LED]Level Mapping = 13
<0>[ 55.072476] (0)[585:PowerManagerSer][LED]ISINK DIM Duty = 6
<0>[ 55.072488] (0)[585:PowerManagerSer][LED]ISINK Current = 1
<5>[ 55.075127] (0)[0:swapper/0][Power/Battery] ******** battery : bat_thread_wakeup ********
<5>[ 55.075212] (0)[45:bat_thread_kthr][Power/Battery] [upmu_is_chr_det] Charger exist and USB is not host
<5>[ 55.075237] (0)[45:bat_thread_kthr][Power/Battery] [BAT_thread]Cable in, CHR_Type_num=1
<5>[ 55.075605] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17825.
<5>[ 55.075628] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17825, adc_result=3916, r_val_temp=4.
<5>[ 55.076005] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17404.
<5>[ 55.076028] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17404, adc_result=3824, r_val_temp=4.
<5>[ 55.076393] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17824.
<5>[ 55.076415] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17824, adc_result=3916, r_val_temp=4.
<5>[ 55.076780] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17401.
<5>[ 55.076800] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17401, adc_result=3823, r_val_temp=4.
<5>[ 55.077164] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17827.
<5>[ 55.077185] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17827, adc_result=3917, r_val_temp=4.
<5>[ 55.077546] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17403.
<5>[ 55.077566] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17403, adc_result=3823, r_val_temp=4.
<5>[ 55.077929] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17833.
<5>[ 55.077949] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17833, adc_result=3918, r_val_temp=4.
<5>[ 55.078311] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17411.
<5>[ 55.078332] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17411, adc_result=3825, r_val_temp=4.
<5>[ 55.078695] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17834.
<5>[ 55.078716] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17834, adc_result=3918, r_val_temp=4.
<5>[ 55.079091] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17408.
<5>[ 55.079114] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17408, adc_result=3825, r_val_temp=4.
<5>[ 55.079490] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17831.
<5>[ 55.079511] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17831, adc_result=3917, r_val_temp=4.
<5>[ 55.080184] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17409.
<5>[ 55.080210] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17409, adc_result=3825, r_val_temp=4.
<5>[ 55.080575] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17838.
<5>[ 55.080596] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17838, adc_result=3919, r_val_temp=4.
<5>[ 55.082468] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17377.
<5>[ 55.082503] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17377, adc_result=3818, r_val_temp=4.
<5>[ 55.083030] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17812.
<5>[ 55.083059] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17812, adc_result=3913, r_val_temp=4.
<5>[ 55.083648] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17401.
<5>[ 55.083676] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17401, adc_result=3823, r_val_temp=4.
<5>[ 55.084270] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17802.
<5>[ 55.084297] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17802, adc_result=3911, r_val_temp=4.
<5>[ 55.084876] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17379.
<5>[ 55.084905] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17379, adc_result=3818, r_val_temp=4.
<5>[ 55.085286] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[6]=17827.
<5>[ 55.085309] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] adc_result_temp=17827, adc_result=3917, r_val_temp=4.
<5>[ 55.086547] (0)[45:bat_thread_kthr][Power/PMIC] [AUXADC] u4channel[7]=17358.
<0>[ 55.087569] (0)[585:PowerManagerSer][LED]Set Backlight directly 255 at time 4294942803
<4>[ 55.087598] (0)[585:PowerManagerSer]mt65xx_leds_set_cust: set brightness, name:lcd-backlight, mode:3, level:255
<0>[ 55.087618] (0)[585:PowerManagerSer][LED]PMIC#2:255
<0>[ 55.087633] (0)[585:PowerManagerSer][LED]Level Mapping = 108
<0>[ 55.087645] (0)[585:PowerManagerSer][LED]ISINK DIM Duty = 31
<0>[ 55.087657] (0)[585:PowerManagerSer][LED]ISINK Current = 5
好奇怪?哪个大神解决一下