linux-kernel - Re: [2/6] 2.6.21-rc2: known regressions

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Message-ID: <20070309111957.GA3928@elf.ucw.cz>
Date:	Fri, 9 Mar 2007 12:19:58 +0100
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Jeff Chua <jeff.chua.linux@...il.com>, linux-pm@...ts.osdl.org,
	lenb@...nel.org, linux-acpi@...r.kernel.org, luming.yu@...el.com,
	Arkadiusz Miskiewicz <arekm@...en.pl>,
	Konstantin Karasyov <konstantin.a.karasyov@...el.com>,
	Greg KH <greg@...ah.com>,
	linux-usb-devel@...ts.sourceforge.net,
	Thomas Meyer <thomas.mey@....de>, Meelis Roos <mroos@...ux.ee>,
	Alexey Starikovskiy <alexey.y.starikovskiy@...ux.intel.com>,
	Janosch Machowinski <jmachowinski@....de>,
	vladimir.p.lebedev@...el.com,
	Ash Milsted <thatistosayiseenem@...ab.com>,
	dmitry.torokhov@...il.com, linux-input@...ey.karlin.mff.cuni.cz,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [2/6] 2.6.21-rc2: known regressions

Hi!

> > disabling the following radeonfb options in the .config made resume work 
> > again:
> 
> In general, don't even *try* to use radeonfb for suspend/resume.
> 
> I don't think it has ever worked, except on some very rare laptops 
> (largely PPC Macs) where people had enough information to set up the 
> PLL's.

It worked ok on thinkpad x32. BIOS did the setup in resume case (with
acpi_sleep=..., anyway), and radeonfb could pick the card up from there.

> I don't think the other framebuffer drivers are much better.
> 
> You're better off using the VGA console, and lettign X re-initialize the 
> graphics device. That generally at least has a reasonably good chance of 
> working.

suspend.sf.net, s2ram there has a long list of tricks. If you invent
new one, please add it there.

> Re-initializing graphics modes really is very hard. You can try with the 
> BIOS video hack (I forget the kernel command line to turn it on), but we 
> really do end up depending on X doing it better.

...or you can try vbetool; it is similar hack to acpi_sleep=... , but
it works for more people.

> Some day we may have modesetting support in the kernel for some graphics 
> hw, right now it's pretty damn spotty.

Yep, that's the way to go.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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