retitle 785606 HID support broken for some devices (incl. DragonRise USB joystick) tags 785606 upstream notfound 785606 3.16.7-ckt9-3 thanks
On Mon, 18 May 2015 11:29:32 +0200 Florent Rougon <f.rou...@free.fr> wrote: > The DragonRise joystick used to work fine in linux-image-3.16.0-4-amd64 > version 3.16.7-ckt9-3 and earlier versions, however its support is broken in > linux-image-4.0.0-1-amd64 version 4.0.2-1. The problem is with the right > stick: > - moving it horizontally is reflected on axis 2 (instead of 3 in previous > versions), but the values are mostly unusable, for instance 0 both in > the center and leftmost positions; > - moving it vertically changes axes 2 and 3 at the same time! > > (in previous versions, axis 2 was already bogus, but axes 0, 1 and 3-6 were > all usable and reflected all possible movements; there is one less axis now > [0-5], and the movements of the right stick are not reflected properly) To put this in a simpler way, axis 3 of this joystick is just missing in recent kernels; and it corresponds to horizontal movement of the right stick. But I have now found which commit introduced the bug (thanks to 'git bisect'), see below. > What puzzles me is that 'git diff v3.16..v4.0 drivers/hid/hid-dr.c' (in a > clone of the upstream linux repo) gives no output. The change must be > elsewhere?.. Yup, the change causing the bug belongs to drivers/hid/hid-input.c, and was introduced in commit 79346d620e9de87912de73337f6df8b7f9a46888 of <git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git>, aka v3.17-rc1-94-g79346d6, dating from August 2014. Applying the reverse patch (obtained with 'git show -R v3.17-rc1-94-g79346d6') to the current linux-image-4.0.0-1-amd64 package in sid (version 4.0.2-1) fixes the problem for me. Of course, it probably causes a regression for the people who introduced this change. So, how do we proceed from here? Should I contact the commit author myself? TIA -- Florent -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
