https://bugzilla.kernel.org/show_bug.cgi?id=91191
--- Comment #8 from EmanueL Czirai <[email protected]> --- Got some extra debug: [ 5054.941313] backlight: set brightness to 9 [ 5054.942356] ACPI : EC: ***** Command(UNDEF) started ***** [ 5054.942363] ACPI : EC: ===== TASK (1) ===== [ 5054.942417] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5054.942422] ACPI : EC: EC_SC(W) = 0x80 [ 5054.943099] ACPI : EC: ===== TASK (2) ===== [ 5054.943165] ACPI : EC: EC_SC(R) = 0x0a SCI_EVT=0 BURST=0 CMD=1 IBF=1 OBF=0 [ 5054.945276] ACPI : EC: ===== IRQ (2) ===== [ 5054.945294] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5054.945300] ACPI : EC: EC_DATA(W) = 0x7f [ 5054.945308] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.946302] ACPI : EC: ===== TASK (3) ===== [ 5054.946318] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.948262] ACPI : EC: ===== IRQ (3) ===== [ 5054.948269] ACPI : EC: EC_SC(R) = 0x01 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=1 [ 5054.948275] ACPI : EC: EC_DATA(R) = 0x08 [ 5054.948286] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.948306] ACPI : EC: ***** Command(UNDEF) stopped ***** [ 5054.948314] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.948554] ACPI : EC: ***** Command(UNDEF) started ***** [ 5054.948559] ACPI : EC: ===== TASK (3) ===== [ 5054.948565] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.948569] ACPI : EC: EC_SC(W) = 0x80 [ 5054.949608] ACPI : EC: ===== TASK (1) ===== [ 5054.949627] ACPI : EC: EC_SC(R) = 0x0a SCI_EVT=0 BURST=0 CMD=1 IBF=1 OBF=0 [ 5054.950971] ACPI : EC: ===== IRQ (2) ===== [ 5054.950988] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5054.950994] ACPI : EC: EC_DATA(W) = 0x83 [ 5054.951003] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.952942] ACPI : EC: ===== TASK (2) ===== [ 5054.952951] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.953914] ACPI : EC: ===== IRQ (3) ===== [ 5054.953924] ACPI : EC: EC_SC(R) = 0x01 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=1 [ 5054.953930] ACPI : EC: EC_DATA(R) = 0x0a [ 5054.953942] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.953979] ACPI : EC: ***** Command(UNDEF) stopped ***** [ 5054.953987] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.954057] ACPI : EC: ***** Command(UNDEF) started ***** [ 5054.954061] ACPI : EC: ===== TASK (3) ===== [ 5054.954096] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.954100] ACPI : EC: EC_SC(W) = 0x81 [ 5054.956215] ACPI : EC: ===== TASK (3) ===== [ 5054.956227] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5054.956231] ACPI : EC: EC_DATA(W) = 0x83 [ 5054.956633] ACPI : EC: ===== IRQ (2) ===== [ 5054.956643] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.956650] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.958383] ACPI : EC: ===== IRQ (1) ===== [ 5054.958400] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.958406] ACPI : EC: EC_DATA(W) = 0x09 [ 5054.958414] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.959668] ACPI : EC: ===== TASK (0) ===== [ 5054.959686] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5054.961389] ACPI : EC: ===== IRQ (3) ===== [ 5054.961403] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.961430] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.961453] ACPI : EC: ***** Command(UNDEF) stopped ***** [ 5054.961472] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5054.964767] APIC error on CPU0: 80 : Illegal register address This is what happens when I do: # echo '9' > /sys/class/backlight/acpi_video0/brightness The debug was set priorly by: # echo 'file drivers/video/backlight/* +p' > /sys/kernel/debug/dynamic_debug/control # echo 'file drivers/acpi/* +p' > /sys/kernel/debug/dynamic_debug/control which only has effect when kernel option CONFIG_DYNAMIC_DEBUG=y Here's when setting brightness back to 10: echo '10' > /sys/class/backlight/acpi_video0/brightness [ 5267.042968] backlight: set brightness to 10 [ 5267.044026] ACPI : EC: ***** Command(UNDEF) started ***** [ 5267.044033] ACPI : EC: ===== TASK (3) ===== [ 5267.044041] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.044046] ACPI : EC: EC_SC(W) = 0x80 [ 5267.046440] ACPI : EC: ===== TASK (0) ===== [ 5267.046457] ACPI : EC: EC_SC(R) = 0x0a SCI_EVT=0 BURST=0 CMD=1 IBF=1 OBF=0 [ 5267.047029] ACPI : EC: ===== IRQ (3) ===== [ 5267.047044] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5267.047050] ACPI : EC: EC_DATA(W) = 0x7f [ 5267.047059] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5267.049904] ACPI : EC: ===== IRQ (3) ===== [ 5267.049921] ACPI : EC: EC_SC(R) = 0x01 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=1 [ 5267.049929] ACPI : EC: EC_DATA(R) = 0x08 [ 5267.049941] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.049951] ACPI : EC: ***** Command(UNDEF) stopped ***** [ 5267.049966] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.050207] ACPI : EC: ***** Command(UNDEF) started ***** [ 5267.050222] ACPI : EC: ===== TASK (1) ===== [ 5267.050234] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.050238] ACPI : EC: EC_SC(W) = 0x80 [ 5267.052852] ACPI : EC: ===== IRQ (3) ===== [ 5267.052862] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5267.052866] ACPI : EC: EC_DATA(W) = 0x83 [ 5267.052874] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5267.056023] ACPI : EC: ===== IRQ (3) ===== [ 5267.056032] ACPI : EC: EC_SC(R) = 0x01 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=1 [ 5267.056038] ACPI : EC: EC_DATA(R) = 0x09 [ 5267.056051] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.056089] ACPI : EC: ***** Command(UNDEF) stopped ***** [ 5267.056098] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.056239] ACPI : EC: ***** Command(UNDEF) started ***** [ 5267.056244] ACPI : EC: ===== TASK (3) ===== [ 5267.056284] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.056288] ACPI : EC: EC_SC(W) = 0x81 [ 5267.058794] ACPI : EC: ===== IRQ (3) ===== [ 5267.058807] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0 [ 5267.058811] ACPI : EC: EC_DATA(W) = 0x83 [ 5267.058819] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5267.059646] ACPI : EC: ===== TASK (0) ===== [ 5267.059664] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5267.061636] ACPI : EC: ===== IRQ (3) ===== [ 5267.061656] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.061662] ACPI : EC: EC_DATA(W) = 0x0a [ 5267.061670] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5267.062916] ACPI : EC: ===== TASK (0) ===== [ 5267.062932] ACPI : EC: EC_SC(R) = 0x02 SCI_EVT=0 BURST=0 CMD=0 IBF=1 OBF=0 [ 5267.064563] ACPI : EC: ===== IRQ (3) ===== [ 5267.064579] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.064601] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.064647] ACPI : EC: ***** Command(UNDEF) stopped ***** [ 5267.064654] ACPI : EC: EC_SC(R) = 0x00 SCI_EVT=0 BURST=0 CMD=0 IBF=0 OBF=0 [ 5267.067316] APIC error on CPU0: 80 : Illegal register address -- You are receiving this mail because: You are watching the assignee of the bug. ------------------------------------------------------------------------------ New Year. 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