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Bug#986561: linux: Regression in drivers/hid/hid-dr.c causing horizontal D-pad to malfunction on SNES joystick

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Salvatore Bonaccorso

Apr 14, 2021, 10:10:10 AM4/14/21
Hi Ioan-Adrian,

On Wed, Apr 07, 2021 at 02:47:24PM +0200, Alessandro Grassi wrote:
> Source: linux
> Severity: normal
> Tags: upstream
> X-Debbugs-Cc:
> Greetings,
> I am encountering the issue described in this thread[1], using a gamepad identified as "DragonRise" with USB ID 0079:0011.
> The joypad works as intended except for the D-pad: up and down are detected in jstest (though misinterpreted: the input graph shows the points in the left up/down corners instead of the center), the left and right buttons are completely ignored.
> Running 'input-events' shows events 0/127 and 255/127 on up and down respectively, nothing at all on left and right.
> I was able to identify that the misbehaviour was caused by this commit[2] on the kernel source tree. To determine this I have rebuilt the Debian kernel using hid-dr.c from the previous commit[3] and loaded hid-dr.ko manually, with which the gamepad worked as intended. I have replaced the file again with the one from the breaking commit iself ([2]) and the behaviour was again broken.
> Furthermore, to confirm that that was the breaking commit, I have commented line 315 (the input mapping one in the struct) from the current Debian source tree and rebuilt it, the joypad works as it should.
> Regards,
> Alessandro
> [1]:
> [2]:
> [3]:

A user in Debian reported that e15944099870 ("HID: hid-dr: add input
mapping for axis selection") introduced a regression, described above.

Does this ring some bell to you?


Ioan-Adrian Ratiu

Apr 14, 2021, 1:30:08 PM4/14/21

On Wed, 14 Apr 2021, Salvatore Bonaccorso <>
Unfortunately no and I do not have the HW to test anymore.

It is possible that change introduced a regression on newer
"DragonRise" gamepads and maybe that mapping logic needs to be a
bit more complex, depending on the HW differences.

Sorry I can't be more helpful,

> Regards,
> Salvatore
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