After the laptop has been in sleep mode for a couple of hours,when I try and resume my session I get the following error:
Read-error on swap device
It takes about 30 seconds for the login screen to load post this happening. Once I log in, the screen blanks out once or twice for a second, and none of my programs are open anymore. I get a "System problem detected" prompt. When I click on "Send Report", another notification pops up saying:
Sorry the program "Xorg" closed unexpectedly. Your computeer does not have enough free memory to automatically analyze the problem and send a report to the developers.
What I have tried so far is to increase the swap space available. It was around 2 GB initially and I created another swap file of 9 GB. This hasn't helped. The occupied swap space ( as per the swapon command ) after the crash is always around 170MB.
The DMESG for when I resume my session, up to the read error on swap device is as follows:
[64046.474054] ACPI: Low-level resume complete [64046.474162] ACPI: EC: EC started [64046.474162] PM: Restoring platform NVS memory [64046.475139] Enabling non-boot CPUs ... [64046.475196] x86: Booting SMP configuration: [64046.475196] smpboot: Booting Node 0 Processor 1 APIC 0x2 [64046.475663] cache: parent cpu1 should not be sleeping [64046.475859] CPU1 is up [64046.475910] smpboot: Booting Node 0 Processor 2 APIC 0x4 [64046.476330] cache: parent cpu2 should not be sleeping [64046.476506] CPU2 is up [64046.476539] smpboot: Booting Node 0 Processor 3 APIC 0x6 [64046.477071] cache: parent cpu3 should not be sleeping [64046.477255] CPU3 is up [64046.477274] smpboot: Booting Node 0 Processor 4 APIC 0x1 [64046.477721] cache: parent cpu4 should not be sleeping [64046.477922] CPU4 is up [64046.477947] smpboot: Booting Node 0 Processor 5 APIC 0x3 [64046.478371] cache: parent cpu5 should not be sleeping [64046.478571] CPU5 is up [64046.478591] smpboot: Booting Node 0 Processor 6 APIC 0x5 [64046.479018] cache: parent cpu6 should not be sleeping [64046.479229] CPU6 is up [64046.479247] smpboot: Booting Node 0 Processor 7 APIC 0x7 [64046.479675] cache: parent cpu7 should not be sleeping [64046.479899] CPU7 is up [64046.485913] ACPI: Waking up from system sleep state S3 [64046.639206] ACPI: EC: event unblocked [64046.639711] sd 2:0:0:0: [sda] Starting disk [64046.873289] usb 1-11: reset full-speed USB device number 2 using xhci_hcd [64046.976869] ata4: SATA link down (SStatus 4 SControl 300) [64046.976892] ata2: SATA link down (SStatus 4 SControl 300) [64047.149289] usb 1-6: reset high-speed USB device number 40 using xhci_hcd [64047.437370] psmouse serio1: synaptics: queried max coordinates: x [..5660], y [..4570] [64047.476302] psmouse serio1: synaptics: queried min coordinates: x [1364..], y [1284..] [64047.922603] OOM killer enabled. [64047.922605] Restarting tasks ... done. [64047.928727] thermal thermal_zone1: failed to read out thermal zone (-61) [64047.930036] Bluetooth: hci0: Bootloader revision 0.0 build 2 week 52 2014 [64047.935036] Bluetooth: hci0: Device revision is 5 [64047.935037] Bluetooth: hci0: Secure boot is enabled [64047.935038] Bluetooth: hci0: OTP lock is enabled [64047.935038] Bluetooth: hci0: API lock is enabled [64047.935039] Bluetooth: hci0: Debug lock is disabled [64047.935040] Bluetooth: hci0: Minimum firmware build 1 week 10 2014 [64047.935042] Bluetooth: hci0: Found device firmware: intel/ibt-11-5.sfi [64047.944372] PM: suspend exit [64048.050329] Read-error on swap-device (8:0:1543400288) [64048.460888] [drm] RC6 on
Please let me know if any other information is needed.
Best Answer
The Ubuntu 18.04 kernel you are currently using is missing a rather important bug fix.
The fix for this is already present in the upstream Linux kernel version 4.16.8. (The suspend bug effectively started happening in kernel version 4.15). Ubuntu only needs to cherry-pick this small patch from upstream. The bug frequently causes Xorg crashes immediately after suspend, i.e. it crashes the whole graphical login session.
Note this bug often happens without showing
Read-error on swap device
. Most of the time, there was no error in the kernel log. (A few times, it showedEXT4-fs error
andBuffer I/O error
instead). Also, these error messages could be caused by a hardware failure instead. When diagnosing this problem, please focus on other, more distinct details.A test kernel is available at the end of this Ubuntu bug, i.e. in this comment: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776887/comments/5
So far no-one has reported their results from suspending with the Ubuntu test kernel.
It might be that if someone can report success, it will encourage the Ubuntu developer to finally include the bug fix. I could be wrong though, I'm not 100% sure what's holding this up.There is also a known workaround. You can avoid the crash if you configure the kernel command line to include the option
scsi_mod.scan=sync
.https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776887