display issue after Suspend

[arp]

I tried the other kernels but no luck. I tend to think the problem relates to memory going into swap (cache?). Any ideas on configuring? Swap size should be ok at 8GB.

[Charlie Brown]

Your swap is more than enough:

swap-1 type: partition size: 11.72 GiB used: 0 KiB

Memory: 5.8 GiB used: 1.84 GiB (31.7%)


We can try to create a resume file, what's the output of this?

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lsblk -f | grep swap

Also what happens if you suspend with this one?

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sudo pm-suspend

[arp]

From the lsbk command I get
├─sda3 swap 1 swapMX e75c0c7f-7643-4d87-9391-0c2360e101a5 [SWAP]

Unfortunately the command line suspend also leads to the same video problem.

Appreciate the help!

[Charlie Brown]

... Unfortunately the command line suspend also leads to the same video problem...

Ok, at least now we know that it's not a light-locker issue.

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echo RESUME=UUID=e75c0c7f-7643-4d87-9391-0c2360e101a5 | sudo tee /etc/initramfs-tools/conf.d/resume ; sudo update-initramfs -uk all

Reboot.

Though this may/may not solve this issue, no harm.

[arp]

Dang! I still get the bad screen after suspend... thanks for the suggestions so far...

[Charlie Brown]

Ok, then , can you still use the terminal and do 1-2 things? Though the screen looks bad...

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inxi -Gaz

when that happens and let's see how it looks at that moment.

[CharlesV]

This is going to sound really odd, but lower your screen res to something under that 1680 and try the suspend.

If it works ok, then you may have an issue with the driver and refresh rate on that iMac.

[arp]

Here's the inix output. just after suspend (screen still bad)

$ inxi -Gaz
Graphics: Device-1: AMD RV610/M74 [Mobility Radeon HD 2400 XT] vendor: Apple driver: radeon
v: kernel bus-ID: 01:00.0 chip-ID: 1002:94c8 class-ID: 0300
Device-2: Apple Built-in iSight type: USB driver: uvcvideo bus-ID: 4-4:2
chip-ID: 05ac:8502 class-ID: 0e02 serial: <filter>
Display: x11 server: X.Org 1.20.11 compositor: xfwm4 v: 4.18.0 driver: loaded: radeon
display-ID: :0.0 screens: 1
Screen-1: 0 s-res: 1680x1050 s-dpi: 96 s-size: 444x277mm (17.5x10.9")
s-diag: 523mm (20.6")
Monitor-1: LVDS res: 1680x1050 hz: 60 dpi: 99 size: 433x270mm (17.0x10.6")
diag: 510mm (20.1")
OpenGL: renderer: AMD RV610 (DRM 2.50.0 / 5.10.0-23-amd64 LLVM 11.0.1)

[arp]

I tried the suggested screen res change but it didn't fix the problem....

[Charlie Brown]

This is really weird cause everything looks normal, drivers are ok and the res.. so, we can try just to turn off and on ..

When that happens try (if one doesn't work, go on with the next one):

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xrandr --display :0 --output LVDS --auto

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xrandr --output LVDS --off ; xrandr --output LVDS --auto

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xrandr --output LVDS --off ; sleep 1 ; xrandr --output LVDS --primary --mode 1680x1050 --rate 60