Public bug reported:
My laptop shows a black screen when resumes from suspend. I'm unable to
log in with ctrl-alt-f1 then ctrl-alt-f7. I'm able to control the
keyboard backlight, the LED on the power button still looks like the way
the laptop is in suspend. I'm only able to log in by pressing the
pm-suspend.log shows this error line. Everything else is success.
Running hook /usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend:
Failed to connect to non-global ctrl_ifname: (null) error: No such file or
directory
/usr/lib/pm-utils/sleep.d/60_wpa_supplicant suspend suspend: success.
After some preliminary testing with kernel 4.0, it seems that the bug is
fixed. I'll do more testing tomorrow. However, I've been getting the
following error message at startup when using kernel 4.0.
Error parsing PCC subspaces from PCCT.
Starting version 219
thinkpad_acpi: unsupported brightness
After more testing, I left the laptop in suspend overnight with kernel
4.0, and it fails to resume in the morning. So the same bug still exists
in kernel 4.0.
** Tags removed: kernel-fixed-upstream
** Tags added: kernel-bug-exists-upstream
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After more researching and testing, I've determined that the bug is
caused by the Intel Rapid Start technology in BIOS. It had a timer of 3
hours after laptop sleeps. I disabled that in BIOS and resume from
suspend started working just fine. I don't know if this is a Ubuntu bug
or a BIOS bug.
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I was testing with the newest 4.0 stable kernel.
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https://bugs.launchpad.net/bugs/1449357
Title:
Thinkpad T450s unable to resume after suspended for a long time
Status in
So I tested with 4.1rc and it also doesn't work with intel rapid start.
I set the rapid start timer to immediate in BIOS and as soon as I close
the lid and open it back up, I was unable to resume to where I was.
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