Linux Mint Stuck on Black Screen After Idle

Linux Mint 20, on Acer Aspire E5-576 laptop.

For the last few weeks, I've had a problem with suspending my laptop. Maybe half the time, instead of suspending as normal, the screen goes black, but the power indicator remains as though it were still active instead of blinking like it should. After that, it won't respond to any input, and the only way to return to normal is to hold down the power button until it forces a shutdown. I know that's terrible for the filesystem, so I'm looking to find a solution.
Oddly, this also happens—again, only sometimes—after long periods of inactivity without trying to suspend it. After maybe ~30-40 minutes without input, the screen goes black and enters the same state. Looking through Preferences, it's not set to auto-suspend at all, just lock the screen and go dark after a while, so I'm not sure what's causing that.

All this only started after I upgraded from 19 "Tara" to 20 "Ulyana". Before that, suspending and resuming always worked as normal. I'm not sure which package triggered the change, but posts about similar problems I have found all seem to tie back to the kernel itself. So I suppose there, but I don't know what part of that is the problem, let alone how to fix it.

What I have tried:

• Normal keyboard or mouse usage: No response. In a normal suspend, that would wake it up, but here the screen remains black.
• Switching to a tty/virtual console: Unavailable. The screen remains black when I try, and trying to log in blind in case the system is still running without displaying it seems to fail.
• SysRq elephants: No response. Any combination of SysRq keys I have tried has done nothing, between the full elephants sequence and just shutting down outright; During normal usage, the SysRq codes work as expected, and /proc/sys/kernel/sysrq has been set to 1, so everything is enabled.
• SSHing into it to check the status: Fails. Trying to connect just hangs midway until it times out.
• Updating the kernel: No change. I went from 5.4.0-54 to 5.8.0-34, but the problem still occurs at about the same rate.

I've also checked /var/log/syslog, which turned up some useful info. After one failed suspend, I thought to check the log file to see what I could glean. The last lines written before the reboot are as follows:

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            Jan  6 15:15:56 <redacted> systemd[1]: Reached target Sleep. Jan  6 15:15:56 <redacted> systemd[1]: Starting Suspend... Jan  6 15:15:56 <redacted> wpa_supplicant[962]: nl80211: deinit ifname=p2p-dev-wlp2s0 disabled_11b_rates=0 Jan  6 15:15:56 <redacted> kernel: [ 3139.245684] PM: suspend entry (deep) Jan  6 15:15:56 <redacted> systemd-sleep[10100]: Suspending system...                      

Compare this to the last lines after a successful suspend:

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            Jan  7 13:11:46 <redacted> systemd-sleep[7591]: Suspending system... Jan  7 13:11:46 <redacted> kernel: [ 3761.240729] PM: suspend entry (deep) Jan  7 13:11:46 <redacted> wpa_supplicant[984]: nl80211: deinit ifname=wlp2s0 disabled_11b_rates=0 Jan  7 13:11:46 <redacted> kernel: [ 3761.568860] Filesystems sync: 0.328 seconds                      

The filesystems sync line that's missing in the failed suspend log seems like useful information, but I''m afraid I don't know what to do with it or what it implies.

I have been unable to find any consistent factor that might be causing it. it more or less happens at random.

I appreciate any help you can provide. I hope I've given enough information to work with, but I can provide more if needed. Thank you!

Output of inxi -Fxxxz:

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            System:   Kernel: 5.8.0-34-generic x86_64 bits: 64 compiler: N/A    Desktop: Cinnamon 4.6.7 wm: muffin 4.6.3 dm: LightDM 1.30.0    Distro: Linux Mint 20 Ulyana base: Ubuntu 20.04 focal  Machine:   Type: Laptop System: Acer product: Aspire E5-576 v: V1.32 serial: <filter>    Mobo: KBL model: Ironman_SK v: V1.32 serial: <filter> UEFI: Insyde v: 1.32    date: 10/24/2017  Battery:   ID-1: BAT1 charge: 39.2 Wh condition: 39.2/62.2 Wh (63%) volts: 12.7/11.1    model: PANASONIC AS16B5J type: Li-ion serial: <filter> status: Full  CPU:   Topology: Dual Core model: Intel Core i3-8130U bits: 64 type: MT MCP    arch: Kaby Lake rev: A L2 cache: 4096 KiB    flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx    bogomips: 17599    Speed: 800 MHz min/max: 400/3400 MHz Core speeds (MHz): 1: 800 2: 800    3: 800 4: 800  Graphics:   Device-1: Intel UHD Graphics 620 vendor: Acer Incorporated ALI    driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:5917    Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa    resolution: 1920x1080~60Hz    OpenGL: renderer: Mesa Intel UHD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.2.6    direct render: Yes  Audio:   Device-1: Intel Sunrise Point-LP HD Audio vendor: Acer Incorporated ALI    driver: snd_hda_intel v: kernel bus ID: 00:1f.3 chip ID: 8086:9d71    Sound Server: ALSA v: k5.8.0-34-generic  Network:   Device-1: Qualcomm Atheros QCA9377 802.11ac Wireless Network Adapter    vendor: Lite-On driver: ath10k_pci v: kernel port: 4040 bus ID: 02:00.0    chip ID: 168c:0042    IF: wlp2s0 state: up mac: <filter>    Device-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet    vendor: Acer Incorporated ALI driver: r8169 v: kernel port: 3000    bus ID: 03:00.1 chip ID: 10ec:8168    IF: enp3s0f1 state: down mac: <filter>    IF-ID-1: ipv6leakintrf0 state: unknown speed: N/A duplex: N/A    mac: <filter>    IF-ID-2: proton0 state: unknown speed: 10 Mbps duplex: full mac: N/A  Drives:   Local Storage: total: 931.51 GiB used: 573.20 GiB (61.5%)    ID-1: /dev/sda vendor: Western Digital model: WD10SPZX-21Z10T0    size: 931.51 GiB speed: 6.0 Gb/s rotation: 5400 rpm serial: <filter>    rev: 1A02 scheme: GPT  Partition:   ID-1: / size: 45.58 GiB used: 23.84 GiB (52.3%) fs: ext4 dev: /dev/sda5    ID-2: /home size: 639.75 GiB used: 549.30 GiB (85.9%) fs: ext4    dev: /dev/sda7    ID-3: swap-1 size: 5.59 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda6  Sensors:   System Temperatures: cpu: 38.0 C mobo: N/A    Fan Speeds (RPM): N/A  Info:   Processes: 245 Uptime: 31m Memory: 11.58 GiB used: 3.47 GiB (29.9%)    Init: systemd v: 245 runlevel: 5 Compilers: gcc: 9.3.0 alt: 7/8/9    Shell: zsh v: 5.8 running in: terminator inxi: 3.0.38                      

Linux Mint Stuck on Black Screen After Idle

Source: https://forums.linuxmint.com/viewtopic.php?t=339285

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