screen dead after resume on Thinkpad X30

[Ian Smith]

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.

Cheers, Ian