linux-kernel - Re: Supporting SYSRQ on broken laptops like the thinkpad T530

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <CAKbGBLg+yp7gAj36EuxCTT5-e4TpBK4MfWxSA-dfnL_LDn7_cQ@mail.gmail.com>
Date:	Sat, 30 Mar 2013 14:16:43 -0700
From:	Steven Noonan <steven@...inklabs.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Marc MERLIN <marc@...lins.org>,
	Linux Kernel mailing List <linux-kernel@...r.kernel.org>,
	edvx1@...temanalysen.net
Subject: Re: Supporting SYSRQ on broken laptops like the thinkpad T530

On Sat, Mar 30, 2013 at 10:56 AM, Pavel Machek <pavel@....cz> wrote:
> On Fri 2013-03-22 15:31:41, Marc MERLIN wrote:
>> On Wed, Jan 09, 2013 at 03:36:44AM +0100, Roland Eggner wrote:
>> > On 2013-01-08 Tuesday at 15:09 -0800 Marc MERLIN wrote:
>> > > In its infinite wisdom, lenovo has removed the sysrq key on the latest
>> > > thinkpads, and replaced it with a stupid ALT+FN+S key combination, which
>> > > doesn't really work for doing sysrq from the console (nor do I know how the
>> > > genius who did that intended for SYSRQ-S to work).
>> > > http://forums.lenovo.com/t5/T400-T500-and-newer-T-series/T430-s-T530-Where-are-the-shortcut-function-keys-break-Pause-etc/ta-p/781749
>> > >
>> > > I realize that one solution is to throw my laptop window at a suitable high
>> > > floorand replace it with one from a vendor that doesn't randomly remove keys
>> > > from the keyboard.
>> > > That said, I was wondering if there were other solutions, especially
>> > > considering that thinkpads used to be the better linux laptops.
>> >
>> > My Dell “Precision M4500” notebook suffers similar (same?) problem.  So far
>> > I could not find a solution better than this:  e.g. Alt-Fn-SysRq-s
>> >
>> > press and hold Alt
>> > press and hold Fn
>> > press and leave F10|SysRq
>> > leave Fn
>> > press and leave s
>> > leave Alt
>>
>> Just for the sake of the archives, turns out that on the lenovo T430 and T530
>> you should ignore the Lenovo documentation I quoted above, and you can
>> indeed use the PrtSc key between Right Alt and Right Ctrl, that key works
>> just fine for Sysrq.
>>
>> I have no idea why Lenovo felt they had to document some complicated
>> alternate software sysrq with Fn+S
>
> Well... I feel resposible for sysrq stuff... I wanted it to be
> non-intrusive. But it might have been bad choice - sysrq was not meant
> to be used as a shift.
>
> Sometimes it works, sometimes it does not. Don't blame lenovo for
> that.
>
> Maybe it should be modified to take sysrq and _then_ key?
>
> Or maybe we should use something like lshift+rshift+lalt+ralt+key?
>

I vote for "something like". Some keyboards (such as my Thinkpad X230
with UK layout) have lshift, lalt, rshift, but no ralt. the ralt is
replaced by AltGr.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/