After I close the lid and wait about half a minute then open the lid, session is locked and login prompt is presented. After I login, the display goes blank / off.
If I then close and reopen the lid, the display comes back and all is normal. I have not yet found any other way to get the display back on. I would prefer not to have to close and reopen the lid to recover from the blank screen.
If I close the lid and reopen before the session is locked, then there is no login prompt and the display comes back on and all is normal. So the issue seems to relate to the session lock somehow.
If I don't close the lid, the session locks, after which I can login and all is normal. The problem only occurs when the session is locked while the lid is closed.
Power Manager settings have:
* When laptop lid is closed: Switch off display
* System sleep mode: Suspend
* Blank after: 2 minutes
* Put to sleep after: 3 minutes
* Switch off after: never
* Automatically lock the session: When the screensaver is activated
* Delay locking after screensaver for: 25
Based on the time until the session is locked after closing the lid, I assume the closing the lid effectively activated the screensaver immediately so that the session is locked 25 seconds after closing the lid. It isn't obvious to me that the system goes to sleep after 3 minutes. It goes quiet (fan stops) after about the same time the session is locked and it doesn't make any difference if I open the lid immediate after this or hours later. Regardless the delay, when I open the lid the login screen appears promptly (sub-second until the display lights up) but the display goes blank after logging in.
When the screen is blank, I can switch to a console which works normally but when I switch back to the desktop the display blanks again.
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System: Host: ian-Satellite-Pro-C665 Kernel: 4.15.0-38-generic x86_64 bits: 64 gcc: 7.3.0 Desktop: Xfce 4.12.3 (Gtk 2.24.31) Distro: Linux Mint 19 Tara Machine: Device: laptop System: TOSHIBA product: Satellite Pro C665 v: PSC2FA-002002 serial: N/A Mobo: TOSHIBA model: Portable PC serial: N/A BIOS: INSYDE v: 1.00 date: 04/01/2011 CPU: Dual core Intel Core i5-2410M (-MT-MCP-) arch: Sandy Bridge rev.7 cache: 3072 KB flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 9179 clock speeds: max: 2900 MHz 1: 820 MHz 2: 802 MHz 3: 803 MHz 4: 993 MHz Graphics: Card: Intel 2nd Generation Core Integrated Graphics Controller bus-ID: 00:02.0 Display Server: x11 (X.Org 1.19.6 ) drivers: modesetting (unloaded: fbdev,vesa) Resolution: email@example.com OpenGL: renderer: Mesa DRI Intel Sandybridge Mobile version: 3.3 Mesa 18.0.5 Direct Render: Yes Audio: Card Intel 6 Series/C200 Series Family High Def. Audio Controller driver: snd_hda_intel bus-ID: 00:1b.0 Sound: Advanced Linux Sound Architecture v: k4.15.0-38-generic Network: Card-1: Qualcomm Atheros AR8152 v2.0 Fast Ethernet driver: atl1c v: 220.127.116.11-NAPI port: 2000 bus-ID: 01:00.0 IF: enp1s0 state: down mac: <filter> Card-2: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) driver: ath9k bus-ID: 02:00.0 IF: wlp2s0 state: up mac: <filter> Drives: HDD Total Size: 530.9GB (53.5% used) ID-1: /dev/sda model: TOSHIBA_MK5076GS size: 500.1GB ID-2: USB /dev/sdb model: Ultra_Fit size: 30.8GB Partition: ID-1: / size: 15G used: 7.0G (53%) fs: ext4 dev: /dev/sda5 ID-2: /home size: 126G used: 41G (35%) fs: ext4 dev: /dev/sda7 ID-3: swap-1 size: 6.14GB used: 0.16GB (3%) fs: swap dev: /dev/sda6 RAID: No RAID devices: /proc/mdstat, md_mod kernel module present Sensors: System Temperatures: cpu: 53.0C mobo: N/A Fan Speeds (in rpm): cpu: N/A Info: Processes: 202 Uptime: 8 days Memory: 1892.2/3892.1MB Init: systemd runlevel: 5 Gcc sys: 7.3.0 Client: Shell (bash 4.4.191) inxi: 2.3.56