Problem with display remaining black after resume
There has been a problem encountered where the display stays black on resuming from suspend.
The symptom might have you think first that your system hang up, but you will realize that your ThinkPad works and you can even reset it via.
Affected Operating Systems
- Linux (it's a kernel issue)
Solution for ThinkPads with ATI graphic chips
This seems to work on x40's, even with Intel Extreme Graphics...
The Solution is to provide the
acpi_sleep=s3_bios kernel parameter in your kernel parameter line.
For grub this can look like this:
title Linux, kernel 2.6.11-1-686 root (hd0,0) kernel /boot/vmlinuz-2.6.11-1-686 root=/dev/hda1 ro acpi_sleep=s3_bios initrd /boot/initrd.img-2.6.11-1-686 savedefault boot
Solution for ThinkPads with Intel Extreme Graphics 2
- First of all, do not use the
- Second, completely remove framebuffer support from your kernel. If it's built as modules, it is important that they do not get loaded at all.
- Before suspending, change to a console and safe the video state with
# cat /proc/bus/pci/00/02.0 > /tmp/video_state.
- On resume, restore the video state with
# cat /tmp/video_state > /proc/bus/pci/00/02.0and change back to X.
The following example /etc/acpi/actions/sleep.sh script shows how to integrate the according lines.
#!/bin/bash # change to console 1 FGCONSOLE=`fgconsole` chvt 6 # safe video state cat /proc/bus/pci/00/02.0 > /tmp/video_state # sync filesystem sync # sync hardware clock with system time hwclock --systohc # go to sleep echo -n 3 > /proc/acpi/sleep # waking up # restore system clock hwclock --hctosys # restore video state cat /tmp/video_state > /proc/bus/pci/00/02.0 # change back to X chvt $FGCONSOLE # clean up behind us rm /tmp/video_state
- If you have this problem with R50e and the above solution doesn't work, try switching to console first. An example sleep script can be found here.