From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Albert Herranz <albert_herranz@yahoo.es>
Cc: linux-kernel@vger.kernel.org
Subject: Re: console remains blanked
Date: Sat, 16 Jul 2005 00:25:35 +1000 [thread overview]
Message-ID: <1121437536.5963.24.camel@gaston> (raw)
In-Reply-To: <20050713231200.24037.qmail@web25801.mail.ukl.yahoo.com>
On Thu, 2005-07-14 at 01:12 +0200, Albert Herranz wrote:
> Hi,
>
> Looks like, since [1] was merged, a blanked console
> (due to inactivity for example) doesn't get unblanked
> anymore when new output is written to it.
>
> This hunk of the already metioned patch, which
> modifies vt_console_print() in drivers/char/vt.c, is
> possibly the cause:
Yes. We discussed that with Linus back then. The problem is that the
printk subsystem tend to abuse calling low level drivers at interrupt
time, and in the case of blanking/unblanking, this can be a problem.
Radeonfb for example relies on beeing able to schedule() at
blank/unblank time.
If this "feature" is really important, maybe the best is to trigger the
workqueue and do the ublank from there.
Ben.
next prev parent reply other threads:[~2005-07-15 14:25 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-07-13 23:12 console remains blanked Albert Herranz
2005-07-14 9:35 ` Jan Engelhardt
2005-07-14 10:18 ` Albert Herranz
2005-07-14 11:38 ` Jan Engelhardt
2005-07-15 14:27 ` Benjamin Herrenschmidt
2005-07-15 14:26 ` Benjamin Herrenschmidt
2005-07-15 14:25 ` Benjamin Herrenschmidt [this message]
2005-07-15 15:09 ` Albert Herranz
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