Bug#677164: [3.2.17-1 -> 3.2.18-1 regression] Wacom tablet in Thinkpad x220t not working

[Jonathan Nieder <jrnieder@gmail.com>]

Nils Kanning wrote:
> On Thu, 2012-06-14 at 17:10 -0500, Jonathan Nieder wrote:

>>>>> patches 0020-0024: tablet works
>>>>> patches 0020-0024,0026: does not work
>>>>
>>>> Thanks!  How about 0026 alone?
>>
>> I'm still curious about this.
>
> Ok, I will try to do this tomorrow.

Thanks again for that.  Another interesting test would be a plain
current (3.5-rc2 or newer) mainline kernel, built like so:

 0. prerequisites

	apt-get install build-essential git

 1. get the kernel history, if you don't already have it

	git clone \
	  git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

 2. configure, build, test

	cd linux
	git fetch --all
	git reset --hard
	git checkout origin/master
	cp /boot/config-$(uname -r) .config; # current configuration
	scripts/config --disable DEBUG_INFO

	# The next step restricts the build to currently loaded modules,
	# according to the principle that other modules are probably for
	# hardware you don't have.
	#
	# Make sure the wacom driver is listed in "lsmod" before doing
	# this, or be sure to reenable wacom afterwards using
	# "make nconfig".
	make localmodconfig; # optional: minimize configuration

	make deb-pkg; # optionally with -j<num> for parallel build
	dpkg -i ../<name of package>; # as root
	reboot
	... test test test ...

If it reproduces the trouble, we can pursue this upstream.  If it
doesn't, we can try to find an appropriate upstream change that explains
the difference.  So either result is a win.

Thanks again for finding and reporting this, by the way.

Sincerely,
Jonathan