linux-kernel - Re: blink driver power saving

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

Message-Id: <200707021439.27357.ak@suse.de>
Date:	Mon, 2 Jul 2007 14:39:27 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
Cc:	"Indan Zupancic" <indan@....nu>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Stephen Hemminger" <shemminger@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, bwalle@...e.de
Subject: Re: blink driver power saving

> > Perhaps one of you geniuses who all hate it can find a better way to
> > solve the "video output dead after kexec; but need visual feedback to the user
> > while crash dumping" problem. I'm waiting for your patches.
> >
> 
> I don't don't like it ;) Unfortunately too many people end up enabling

Yes that's pretty weird. I admit I hadn't expected
that problem. blink is equivalent to "annoy me" and it
is a mystery why so many people should willingly ask their computer to 
annoy them.

Or perhaps they update their configs with yes | make oldconfig? 

User psychology can be mysterious.

I wonder if the kernel offered a CONFIG_FORMAT_FILESYSTEMS_AT_BOOT
how many people would enable that @) Might be an interesting experiment
for next April.

> it and having issues with their keyboards.

Forcing a suitable slow rate should fix that shouldn't it? We need
that anyways to stop the "setleds DOS". 

> Can we have it depend on 
> DEBUG_KERNEL? 

Yes that would be probably a good idea; even though it is technically
not correct: the debug kernel doesn't try to debug itself. But anyways,
it's probably the best place.

> And probably KEXEC as well? 

The kcrash kernel doesn't necessarily need to have kexec enabled by
itself.

> Another option would be for it not use panic_blink. Do your kexec
> kernels have atkbd support enabled? You could write an new "blink"
> input handler that would latch to keyboards supporting leds and blink
> by sending EV_LED events.

Yes that would be probably a better implementation. Also hook something
for USB keyboards. iirc Bernhard Walle (cc'ed) was looking at that.

-Andi
-
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/