linux-kernel - Re: [Regression 2.6.35-rc1?] Sysrq works too well (no need of alt)

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Message-Id: <201006192316.32360.rjw@sisk.pl>
Date:	Sat, 19 Jun 2010 23:16:32 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Éric Piel <E.A.B.Piel@...elft.nl>
Cc:	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Regression 2.6.35-rc1?] Sysrq works too well (no need of alt)

On Tuesday, June 08, 2010, Éric Piel wrote:
> Hello,
> I haven't investigated much yet, but I have the feeling that since
> 2.6.35-rc1 my "Print Screen/SysRq" key works only as SysRq: if I press
> it (normally assigned to take screenshot in gnome), nothing happens (no
> input event received in userspace) and no key on the keyboard works
> afterwards, until I press Alt. Actually the keys work, but behave as if
> the sysrq key was kept pressed (can be seen in dmesg, or by pressing "b").
> 
> Looking at the log, a potential culprit is commit
> 97f5f0cd8cd0a05449cbb77d1e6f02e026875802 (Input: implement SysRq as a
> separate input handler). Probably the logic of "have to press all the
> keys at the same time" changed to "have to press the keys one after each
> other". So pressing alt and later on pressing PrintScreen leads to a SysRq.
> 
> Does anybody else see this behaviour? Any suggestion on how to solve
> this bug? I'll try reverting the commit and report if it fixes the
> problem (the git revert fails so I've got to fix the conflict manually).

Is this still a problem with 2.6.35-rc3?

Rafael
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