Hi Takashi, On Fri, Sep 10, 2021 at 7:50 AM Takashi Iwai <tiwai@xxxxxxx> wrote: > > Hi, > > we've received a bug report about the missing keyboard on ASUS Zenbook > 14 with AMD Ryzen: > https://bugzilla.suse.com/show_bug.cgi?id=1190256 > > In short, PS2 keyboard couldn't be probed at the cold boot, while it > could be detected fine at the warm boot. The failure appears like: > > [ 0.512668] i8042: PNP: PS/2 Controller [PNP0303:PS2K] at 0x60,0x64 irq 1 > [ 0.512672] i8042: PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp > [ 1.033609] i8042: Can't read CTR while initializing i8042 > [ 1.033632] i8042: probe of i8042 failed with error -5 > > As openSUSE kernel builds PS2 drivers as built-in, and the probe at > the early boot failed. Meanwhile, when we rebuilt the kernel with > those drivers as modules, it starts working magically. So, this is > likely a timing problem. > > A possibly workaround I can think of would be to allow re-probing the > device at a later point. Do we have a good way for that, or a better > alternative solution? Would probe defer help here? Something like this: --- a/drivers/input/serio/i8042.c +++ b/drivers/input/serio/i8042.c @@ -1549,7 +1549,7 @@ static int __init i8042_probe(struct platform_device *dev) error = i8042_controller_init(); if (error) - return error; + return -EPROBE_DEFER; #ifdef CONFIG_X86
