linux-kernel - Re: video resume stuff

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Message-ID: <47068398.9070304@zytor.com>
Date:	Fri, 05 Oct 2007 11:34:00 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jiri Kosina <jikos@...os.cz>
CC:	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: video resume stuff

Jiri Kosina wrote:
> On Fri, 5 Oct 2007, Pavel Machek wrote:
> 
>>> I suggest we tackle this *after* the x86 merge.
>> Well, we still have the regression on jikos' strange system, and I would 
>> like to understand what is going on there.
> 
> Sorry for this taking too long. Finally I had the time to play with this 
> again, so here goes the current summary. I have a system here, that:
> 
> - with 1d67953f2bda8876045c24ae58841f27d9bb7572 (just before the setup 
>   code rewrite), resumes nicely in VGA console 
>   (acpi_sleep=s3_bios,s3_mode kernel parameter is needed), everything 
>   works
> 
> - with c39736823232bc3ca113c8228fa852c09fba300e (just after the setup code 
>   rewrite), VGA text console is garbled after resume - looks like the 
>   video RAM contains some strange data (patterns from BIOS post can be 
>   recognized, there are some various-colored stripes across the screen, 
>   etc). The machine also seems to be frozen (no keyboard LEDs working, 
>   etc).
> 
> - with 2.6.23-rc9, the video doesn't come up at all, I can't even see the 
>   garbled picture any more - the display stays blank, the LED diod is 
>   yellow (i.e. looks like completely no signal from VGA card). On the 
>   other hand, the machine seems to work otherwise
> 

Jiri, what particular video mode are you running in?  In other words, 
what is your vga= parameter set to?  In fact, what does your entire 
kernel command line look like?

Also, if you could extract the information requested in:

http://marc.info/?i=46FD802D.2030804@zytor.com

... that would really help.

	-hpa

(who notices we really need to export boot_params to userspace for sanity)
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