So the backlight is set to 255 most of the time (because with that value it is stable)... I have pressed the decrease and increase backlight buttons some times:
arg4 is different... arg5 is 0x0 here too... Aspire-A315-41:~$ sudo kprobe-perf 'p:dce_abm_set_backlight_level_pwm $arg1 $arg2 $arg3 $arg4 $arg5 ' Tracing kprobe dce_abm_set_backlight_level_pwm. Ctrl-C to end. mate-power-back-7094 [002] .... 4130.246969: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xf4fd arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7100 [002] .... 4140.650308: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xe9fb arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7106 [004] .... 4148.360022: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xf4fd arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7112 [006] .... 4150.064228: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xffff arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7117 [000] .... 4154.430645: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xf4fd arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7123 [000] .... 4156.020204: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xe9fb arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7129 [000] .... 4169.318284: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xf4fd arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7135 [003] .... 4171.173554: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xffff arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7141 [006] .... 4177.134779: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xf4fd arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7147 [000] .... 4178.988650: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xe9fb arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7152 [005] .... 4179.822378: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xdef9 arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7157 [003] .... 4180.801012: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xd3f7 arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7162 [003] .... 4181.676478: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xc8f5 arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7173 [004] .... 4186.458165: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xd3f7 arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7179 [000] .... 4186.989282: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xdef9 arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7184 [000] .... 4187.362960: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xe9fb arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7189 [002] .... 4187.737620: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xf4fd arg3=0x0 arg4=0x1 arg5=0x0 mate-power-back-7194 [007] .... 4188.118618: dce_abm_set_backlight_level_pwm: (dce_abm_set_backlight_level_pwm+0x0/0x410 [amdgpu]) arg1=0xffff9cabd4c87800 arg2=0xffff arg3=0x0 arg4=0x1 arg5=0x0 ^C Ending tracing... -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1861925 Title: BrightnessOutofRange: Actual brightness for amdgpu_bl0 not in range 0..255 Status in linux package in Ubuntu: Incomplete Bug description: Hi, I have a acer aspire a315-41 laptop, it has BIOS 1.15, Ubuntu 19.10, Kernel stock 5.3, and 5.5.0. I have a problem with the Backlight. I can not control. According to: https://wiki.ubuntu.com/Kernel/Debugging/Backlight It is : Backlight control does not work, but there are entries in /sys/class/backlight. The problem is as far I could find: sanya@Aspire-A315-41:/sys/class/backlight/amdgpu_bl0$ cat brightness 135 sanya@Aspire-A315-41:/sys/class/backlight/amdgpu_bl0$ cat actual_brightness 43500 sanya@Aspire-A315-41:/sys/class/backlight/amdgpu_bl0$ cat max_brightness 255 The brightness read from the HW is not in the range, and when I change the brightness by the keys the value in the brightness file changes too, but the actual_brightness is stuck at the value 43500... I have tried all the steps mentioned in https://wiki.ubuntu.com/Kernel/Debugging/Backlight Actually I have tried all these kernel startup parameter variants without luck: GRUB_CMDLINE_LINUX_DEFAULT="" #GRUB_CMDLINE_LINUX_DEFAULT="video.use_native_backlight=1" #GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=" #GRUB_CMDLINE_LINUX_DEFAULT="video.use_bios_initial_backlight=0" #GRUB_CMDLINE_LINUX_DEFAULT="amdgpu.dcfeaturemask=0x4 amdgpu.abmlevel=2" #GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=video amdgpu.abmlevel=1" #GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=Linux acpi_backlight=vendor" #GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\" acpi_backlight=vendor" #GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\" acpi_backlight=video" #GRUB_CMDLINE_LINUX_DEFAULT="acpi_osi=! acpi_osi=\"Windows 2009\" acpi_backlight=vendor" #GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\" acpi_backlight=vendor" #GRUB_CMDLINE_LINUX_DEFAULT="i8042.nopnp acpi_osi=! acpi_osi=\"Windows 2009\" acpi_backlight=vendor" I guess the fwts has found also this as an error: autobrightness: Automated LCD brightness test. -------------------------------------------------------------------------------- Test 1 of 2: Test for maximum and actual brightness. PASSED: Test 1, Maximum brightness for amdgpu_bl0 is 255 which is sane. FAILED [HIGH] BrightnessOutofRange: Test 1, Actual brightness for amdgpu_bl0 not in range 0..255. Test 2 of 2: Change actual brightness. FAILED [MEDIUM] BrightnessMismatch: Test 2, 256 brightness levels did not match the brightnesss level just set for backlight amdgpu_bl0. The failed brightness levels were: 0-255. It would be great if someone could help set the HW brightness back to the normal range. If you need any more debug files please let me know! Thanks, Regards, Sandor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1861925/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
