screen dead after resume on Thinkpad X30

Nate Lawson nate at root.org
Thu Dec 7 19:55:24 PST 2006


Ian Smith wrote:
> On Thu, 7 Dec 2006, Lutz Boehne wrote:
> 
>  > I'm tracking RELENG_6 and after one upgrade, my Thinkpad X30 does not
>  > properly wake up out of standby anymore. After waking up, the laptop
>  > will still respond to key presses and I am able to reboot it by pressing
>  > Ctrl-Alt-Del, but nothing will appear on the screen until I see the BIOS
>  > POST.
>  > 
>  > I spent some time to narrow down which changes in RELENG_6 seem to be
>  > responsible and found out that RELENG_6 from August 16th 2006 12:01am
>  > works fine and that RELENG_6 from 08:00pm that day does not.
>  > 
>  > Candidate files are:
>  > src/sys/dev/acpica/acpi_video.c
>  > src/sys/i386/acpica/acpi_machdep.c
>  > src/sys/i386/acpica/acpi_wakecode.S
>  > src/sys/i386/acpica/acpi_wakeup.c
>  > 
>  > I locally replaced those files in today's RELENG_6 with versions from
>  > before August 16th, built/installed kernel and world and resume works
>  > properly again.
> 
> Not sure if it's your {,only} problem, but the default value for
> hw.acpi.reset_video changed fairly recently, I think from 1 to 0, as I
> had to set hw.acpi.reset_video=0 in /etc/sysctl.conf on a Thinkpad T23
> on 6.1-RELEASE.  You'll find recent references to this in the archives. 
> 
> Try hardwiring the value from your working version into sysctl.conf.
> 
> FWIW, I also needed hw.syscons.sc_no_suspend_vtswitch=1 on the T23.

Thanks for answering.  The reason why the default is now 0 is that it 
caused some systems to spontaneously reset if it was 1.  I did a quick 
check and it seemed that 1 causes more trouble overall than 0 so 0 is 
the default.

-- 
Nate


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