Public bug reported: Hi,
I have a acer aspire a315-41 laptop. 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 fix... 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 ** Affects: xserver-xorg-video-amdgpu (Ubuntu) Importance: Undecided Status: New ** Attachment added: "sudo fwts" https://bugs.launchpad.net/bugs/1861925/+attachment/5325407/+files/results.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1861925 Title: BrightnessOutofRange: Actual brightness for amdgpu_bl0 not in range 0..255 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-amdgpu/+bug/1861925/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
