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I'm using Ubuntu 14.04 on a Lenovo IdeaPad S205. When I resume from suspend-to-RAM, fan goes on but screen stays off. The computer does not respond to anything except a hard shutdown (press and hold the power button). I have done some debugging, but I don't know what conclusion to draw. Any ideas based on the results below?

Some debug sources I found:

Tests and results

All commands are entered as root (sudo -i).

dmesg_after

Procedure

# echo mem > /sys/power/state; dmesg > dmesg_after

Result

Like usual, black on resume. Importantly, no dmesg_after file is created.

pm_test

Procedure

# echo freezer > /sys/power/pm_test
# echo mem > /sys/power/state

Repeat above and subsitute freezer with devices, platform, processors and core.

Result

Resumes fine.

Without X

Procedure

  1. At boot, press ESC to enter GRUB menu
  2. Edit first entry, edit kernel ... line, append rw init=/bin/bash, and boot
  3. In the shell, repeat pm_test procedures

Result

Same as with X. With freezer, devices, platform, processors or core in /sys/power/pm_test, resume works fine. Otherwise, resume gives black screen of death. No dmesg_after file is created.

Latest kernel

Procedure

  1. Install latest kernel according to the Kernel/MainlineBuilds Ubuntu Wiki page (3.16.0-031600rc5)
  2. Reboot with new kernel, with or without X
  3. Repeat the "dmesg_after" test

Result

Same as with current stable kernel (3.13.0-32-generic).

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closed as off-topic by bain, Eric Carvalho, Luis Alvarado Jul 25 at 0:10

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Bug reports and problems specific to development version of Ubuntu should be reported on Launchpad so that developers can see, track and fix these issues." – bain, Eric Carvalho, Luis Alvarado
If this question can be reworded to fit the rules in the help center, please edit the question.

    
It seems there is also no BIOS upgrade available from Lenovo: the Downloads page lists a single "BIOS update", which is apparently the version I already have (according to sudo dmidecode | grep -A3 'BIOS Information'). –  Arild Jul 23 at 21:25