On Thursday 03 August 2006 12:36, Stefan Seyfried wrote:
> On Thu, Aug 03, 2006 at 03:06:00PM +0530, Kapil Hari Paranjape wrote:
> Content-Description: message
> > Hello,
> > 
> > I am using a Debian etch system:
> > 
> > kernel: linux-image-2.6.17-1-686 Debian version 2.6.17-5
> > s2ram: uswsusp Debian version 0.2-1
> > 
> > kernel command line: kernel /vmlinuz-2.6.17-1-686 
> > root=/dev/mapper/store-root rw quiet init=/bin/bash
> > (kernel uses Debian built initramfs which uses a standard test console).
> > 
> > This machine can be identified by:
> >     sys_vendor   = "IBM"
> >     sys_product  = "2887NQ9"
> >     sys_version  = "ThinkPad R51"
> >     bios_version = "1VET66WW (1.24 )"
> > 
> > lspci -v output is attached.
> > 
> > I tried each command in succession:
> > 
> >     s2ram -f
> >     s2ram -f -a 1
> >     s2ram -f -a 2
> >     s2ram -f -a 3
> >     s2ram -f -p -s
> >     s2ram -f -s
> >     s2ram -f -p
> >     s2ram -f -a 1 -s
> > 
> > None of these "worked". For each of them the system went into suspend
> > mode. One resuming with the power button or the "function Fn key",
> > the system came up the state where it had the message about "stopping
> > tasks" with "======|" at the top of the screen. After this the screen
> > did not show anything and keyboard activity produced apparently no
> > effect. However, I managed to use Alt-Sysrq to Sync and Unmount
> > disks but power-Off did not work---system did not power-off.
> > 
> > I do however *have* a working suspend-to-ram configuration that I learnt
> > from 
> >     
> > http://www.thinkwiki.org/Problem_with_display_remaining_black_after_resume#Solution_for_ThinkPads_with_Intel_Extreme_Graphics_2
> 
> 404
> 
> > This involves saving the contents of /proc/bus/pci/00/02.0 before
> > suspending and restoring it after suspending. I am attaching the
> > relevant script.
> 
> This is known to some extents, for R50e we have this in the whitelist:
>         /* R50e needs not yet implemented save_video_pci_state :-(
>         { "IBM",                        "1834*",                "",     "", 
> UNSURE },
>         { "IBM",                        "1842*",                "",     "", 
> UNSURE },
>         { "IBM",                        "2670*",                "",     "", 
> UNSURE },
>         */
> 
> and your machine probably also falls into the same category.
> However, _i_ consider this to be either a driver or a pci-subsystem kernel
> bug which really should be solved there.
> 
> If somebody really thinks we should work around this in userspace, he has
> to either use a custom script and wrap this around "s2ram -f" or send a
> patch that implements this cleanly in s2ram. At least this is my opinion
> on the matter :-)

This is a kernel problem, apparently, and kernel problems should be solved
in the kernel.

Greetings,
Rafael

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