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SubjectUnwanted delayed execution of _Qxx EC methods
Date
Hi,

I'd like to report a minor issue I have with the ACPI embedded controller
driver. My laptop (XPS13 9333) has two function keys to control the
screen brightness. When pressed, two _Qxx ACPI methods are called, one
to increase and one to decrease the brightness. Both the methods sleep
for 200ms.

This pause of 200ms is causing some problems when I keep one of the
function keys pressed. In this situation, more queries than needed
are scheduled for a delayed execution, making the screen brightness
change even after the function key is released.

Here below you can see some log lines that show the problem.

If I keep the function key pressed for X seconds, it will take roughly
2X seconds for all the queries to be executed.

Is there any way to prevent this from happening?

Thanks,
Gabriele

[ 47.213439] ACPI : EC: ===== IRQ (1) =====
[ 47.213455] ACPI : EC: EC_SC(R) = 0x20 SCI_EVT=1 BURST=0 CMD=0 IBF=0 OBF=0
[ 47.213458] ACPI : EC: ***** Event started *****
[ 47.213509] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.213522] ACPI : EC: ===== TASK (1) =====
[ 47.213533] ACPI : EC: EC_SC(R) = 0x20 SCI_EVT=1 BURST=0 CMD=0 IBF=0 OBF=0
[ 47.213536] ACPI : EC: EC_SC(W) = 0x84
[ 47.213544] ACPI : EC: ***** Event stopped *****
[ 47.213547] ACPI : EC: ***** Event started *****
[ 47.218812] ACPI : EC: ===== TASK (1) =====
[ 47.218829] ACPI : EC: EC_SC(R) = 0x2a SCI_EVT=1 BURST=0 CMD=1 IBF=1 OBF=0
[ 47.220195] ACPI : EC: ===== IRQ (1) =====
[ 47.220212] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.220219] ACPI : EC: EC_DATA(R) = 0x80
[ 47.220222] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.220251] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.220260] ACPI : EC: ##### Query(0x80) scheduled #####
[ 47.220273] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.220277] ACPI : EC: ===== TASK (1) =====
[ 47.220290] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.220293] ACPI : EC: ##### Query(0x80) started #####
[ 47.220301] ACPI : EC: EC_SC(W) = 0x84
[ 47.220308] ACPI : EC: ***** Event stopped *****
[ 47.221021] ACPI : EC: ===== IRQ (0) =====
[ 47.221037] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.221045] ACPI : EC: EC_DATA(R) = 0x00
[ 47.221048] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.221063] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.422969] ACPI : EC: ##### Query(0x80) stopped #####
[ 47.487914] ACPI : EC: ===== IRQ (1) =====
[ 47.487926] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.487928] ACPI : EC: ***** Event started *****
[ 47.487962] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.487969] ACPI : EC: ===== TASK (1) =====
[ 47.487978] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.487981] ACPI : EC: EC_SC(W) = 0x84
[ 47.487986] ACPI : EC: ***** Event stopped *****
[ 47.487988] ACPI : EC: ***** Event started *****
[ 47.488557] ACPI : EC: ===== IRQ (1) =====
[ 47.488580] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.488584] ACPI : EC: EC_DATA(R) = 0x80
[ 47.488585] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.488602] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.488607] ACPI : EC: ##### Query(0x80) scheduled #####
[ 47.488613] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.488615] ACPI : EC: ===== TASK (1) =====
[ 47.488623] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.488624] ACPI : EC: ##### Query(0x80) started #####
[ 47.488628] ACPI : EC: EC_SC(W) = 0x84
[ 47.488633] ACPI : EC: ***** Event stopped *****
[ 47.490090] ACPI : EC: ===== IRQ (0) =====
[ 47.490100] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.490103] ACPI : EC: EC_DATA(R) = 0x00
[ 47.490104] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.490110] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.577686] ACPI : EC: ===== IRQ (1) =====
[ 47.577698] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.577699] ACPI : EC: ***** Event started *****
[ 47.577722] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.577724] ACPI : EC: ===== TASK (1) =====
[ 47.577731] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.577733] ACPI : EC: EC_SC(W) = 0x84
[ 47.577736] ACPI : EC: ***** Event stopped *****
[ 47.577737] ACPI : EC: ***** Event started *****
[ 47.578309] ACPI : EC: ===== IRQ (1) =====
[ 47.578315] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.578319] ACPI : EC: EC_DATA(R) = 0x80
[ 47.578320] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.578328] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.578331] ACPI : EC: ##### Query(0x80) scheduled #####
[ 47.578334] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.578336] ACPI : EC: ===== TASK (1) =====
[ 47.578343] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.578345] ACPI : EC: EC_SC(W) = 0x84
[ 47.578350] ACPI : EC: ***** Event stopped *****
[ 47.580030] ACPI : EC: ===== IRQ (1) =====
[ 47.580040] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.580044] ACPI : EC: EC_DATA(R) = 0x00
[ 47.580045] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.580063] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.667627] ACPI : EC: ===== IRQ (1) =====
[ 47.667638] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.667640] ACPI : EC: ***** Event started *****
[ 47.667669] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.667671] ACPI : EC: ===== TASK (1) =====
[ 47.667678] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.667680] ACPI : EC: EC_SC(W) = 0x84
[ 47.667683] ACPI : EC: ***** Event stopped *****
[ 47.667684] ACPI : EC: ***** Event started *****
[ 47.668157] ACPI : EC: ===== IRQ (1) =====
[ 47.668167] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.668171] ACPI : EC: EC_DATA(R) = 0x80
[ 47.668172] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.668188] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.668192] ACPI : EC: ##### Query(0x80) scheduled #####
[ 47.668198] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.668200] ACPI : EC: ===== TASK (1) =====
[ 47.668209] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.668211] ACPI : EC: EC_SC(W) = 0x84
[ 47.668216] ACPI : EC: ***** Event stopped *****
[ 47.669836] ACPI : EC: ===== IRQ (1) =====
[ 47.669847] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.669850] ACPI : EC: EC_DATA(R) = 0x00
[ 47.669852] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.669880] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.691187] ACPI : EC: ##### Query(0x80) stopped #####
[ 47.691192] ACPI : EC: ##### Query(0x80) started #####
[ 47.792343] ACPI : EC: ===== IRQ (1) =====
[ 47.792355] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.792357] ACPI : EC: ***** Event started *****
[ 47.792387] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.792389] ACPI : EC: ===== TASK (1) =====
[ 47.792396] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.792398] ACPI : EC: EC_SC(W) = 0x84
[ 47.792401] ACPI : EC: ***** Event stopped *****
[ 47.792405] ACPI : EC: ***** Event started *****
[ 47.793445] ACPI : EC: ===== IRQ (1) =====
[ 47.793456] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.793460] ACPI : EC: EC_DATA(R) = 0x80
[ 47.793461] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.793480] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.793485] ACPI : EC: ##### Query(0x80) scheduled #####
[ 47.793491] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.793493] ACPI : EC: ===== TASK (1) =====
[ 47.793501] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.793504] ACPI : EC: EC_SC(W) = 0x84
[ 47.793509] ACPI : EC: ***** Event stopped *****
[ 47.794994] ACPI : EC: ===== IRQ (1) =====
[ 47.795004] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.795007] ACPI : EC: EC_DATA(R) = 0x00
[ 47.795009] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.795022] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.882247] ACPI : EC: ===== IRQ (1) =====
[ 47.882260] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.882262] ACPI : EC: ***** Event started *****
[ 47.882299] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.882302] ACPI : EC: ===== TASK (1) =====
[ 47.882310] ACPI : EC: EC_SC(R) = 0x28 SCI_EVT=1 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.882312] ACPI : EC: EC_SC(W) = 0x84
[ 47.882318] ACPI : EC: ***** Event stopped *****
[ 47.882319] ACPI : EC: ***** Event started *****
[ 47.882888] ACPI : EC: ===== IRQ (1) =====
[ 47.882896] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.882900] ACPI : EC: EC_DATA(R) = 0x80
[ 47.882901] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.882914] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.882919] ACPI : EC: ##### Query(0x80) scheduled #####
[ 47.882924] ACPI : EC: ***** Command(QR_EC) started *****
[ 47.882927] ACPI : EC: ===== TASK (1) =====
[ 47.882935] ACPI : EC: EC_SC(R) = 0x08 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=0
[ 47.882937] ACPI : EC: EC_SC(W) = 0x84
[ 47.882942] ACPI : EC: ***** Event stopped *****
[ 47.884614] ACPI : EC: ===== IRQ (1) =====
[ 47.884627] ACPI : EC: EC_SC(R) = 0x09 SCI_EVT=0 BURST=0 CMD=1 IBF=0 OBF=1
[ 47.884632] ACPI : EC: EC_DATA(R) = 0x00
[ 47.884634] ACPI : EC: ***** Command(QR_EC) hardware completion *****
[ 47.884655] ACPI : EC: ***** Command(QR_EC) stopped *****
[ 47.895378] ACPI : EC: ##### Query(0x80) stopped #####
[ 47.895388] ACPI : EC: ##### Query(0x80) started #####
[ 48.099496] ACPI : EC: ##### Query(0x80) stopped #####
[ 48.099502] ACPI : EC: ##### Query(0x80) started #####
[ 48.303660] ACPI : EC: ##### Query(0x80) stopped #####
[ 48.303665] ACPI : EC: ##### Query(0x80) started #####
[ 48.507823] ACPI : EC: ##### Query(0x80) stopped #####


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