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Date: Mon, 2 Mar 2015 22:03:49 +0100 From: Pavel Machek <pavel@....cz> To: NeilBrown <neilb@...e.de> Cc: Tomi Valkeinen <tomi.valkeinen@...com>, linux-omap@...r.kernel.org, linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org, GTA04 owners <gta04-owner@...delico.com>, "Rafael J. Wysocki" <rjw@...ysocki.net> Subject: Re: [PATCH] OMAP: DSS: DPI: disable vt-switch on suspend/resume. Hi! > > Looking at the drivers/tty/vt/vt_ioctl.c, it sounds to me that we should > > always do pm_set_vt_switch(0), as omapdss restores everything just fine > > on resume. Although it makes me wonder how it works if there are two > > display controllers, one needing the switch and the other not... > > I wondered that too. It would seem to make more sense for > pm_set_vt_switch(0) to be the default, that drivers which need the textmode > switch should call (1). But I suspect there are "historical reasons" for the > current situation. Well... historically, we did not have drivers for graphics cards -- kernel did not know how to handle it, only X knew. For cards that do not have kernel driver, only X one, we need to switch vts. For cards that have proper driver, we should be able to survive without VT switch. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- 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/
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