fbstatus not showing/updating on Morefine M6S N100

[ben-auo]

Ref #3 and https://github.com/gokrazy/kernel.amd64/issues/34#issuecomment-2708491758

I've been analyzing this issue for a bit and found a temporary workaround with this command:

timeout 2s /user/fbstatus ; while true; do /user/fbstatus; sleep 10; done

Without it, the screen just shows a thin gray bar at the top of the screen. Running /user/fbstatus and then Control+C to quit shows the correct frame. If I try looping it it just shows the gray bar so I have to do a single initial run and quit and then the loop to get the desired effect. After some trial and error, I found 10 seconds to be the right delay to get the full top results. Here's a video of the workaround in action in case it helps: https://u.pcloud.link/publink/show?code=XZqCCf5Zej2lpfoAiVJ3MnsbbzCSWRfU2Nsk

[stapelberg]

On which hardware are you observing issues? Can you describe the issue in your own word, without referencing these other (perhaps unrelated) issues?

It’s bizarre that such looping would be required 😲 I wonder what the actual issue is.

[ben-auo]

Admittedly, my test monitor is a wonky 5:4 aspect ratio: HP LP1965. My device is a Morefine M6S N100.

Here's the behavior:

1. Create vanilla gokrazy instance via USB thumb drive:

gok new
gok overwrite --full /dev/sda

This boots with a gray bar along the top and no other visuals.

2. On another computer, I enable breakglass and SSH into the device and run fbstatus:

# /user/fbstatus
2025/07/07 18:49:42 opening next free console /dev/tty3
2025/07/07 18:49:42 framebuffer screeninfo: {Xres:1280 Yres:1024 Xres_virtual:1280 Yres_virtual:1024 Xoffset:0 Yoffset:0 Bits_per_pixel:32 Grayscale:0 Red:{Offset:16 Length:8 Right:0} Green:{Offset:8 Length:8 Right:0} Blue:{Offset:0 Length:8 Right:0} Transp:{Offset:0 Length:0 Right:0} Nonstd:0 Activate:0 Height:300 Width:380 Accel_flags:0 Pixclock:0 Left_margin:0 Right_margin:0 Upper_margin:0 Lower_margin:0 Hsync_len:0 Vsync_len:0 Sync:0 Vmode:0 Rotate:0 Colorspace:0 Reserved:[0 0 0 0]}
2025/07/07 18:49:42 font scale factor: 1
2025/07/07 18:49:42 gopher scaled in 30.911971ms

The screen briefly flickers with the gokrazy screen and then goes back to the gray bar along the top with no other visuals.

3. I Ctrl+C to stop fbstatus in the SSH session

2025/07/07 18:49:42 gopher scaled in 30.911971ms
^C2025/07/07 18:50:52 context canceled

The gokrazy screen now appears but does not refresh (live updates)

4. I run fbstatus again. Same behavior as Step 2.

5. I Ctrl+C to stop fbstatus in the SSH session

# /user/fbstatus
2025/07/07 18:52:04 opening next free console /dev/tty3
2025/07/07 18:52:04 framebuffer screeninfo: {Xres:1280 Yres:1024 Xres_virtual:1280 Yres_virtual:1024 Xoffset:0 Yoffset:0 Bits_per_pixel:32 Grayscale:0 Red:{Offset:16 Length:8 Right:0} Green:{Offset:8 Length:8 Right:0} Blue:{Offset:0 Length:8 Right:0} Transp:{Offset:0 Length:0 Right:0} Nonstd:0 Activate:0 Height:300 Width:380 Accel_flags:0 Pixclock:0 Left_margin:0 Right_margin:0 Upper_margin:0 Lower_margin:0 Hsync_len:0 Vsync_len:0 Sync:0 Vmode:0 Rotate:0 Colorspace:0 Reserved:[0 0 0 0]}
2025/07/07 18:52:04 font scale factor: 1
2025/07/07 18:52:04 gopher scaled in 31.747624ms
^C2025/07/07 18:52:54 context canceled

The gokrazy screen does not appear. The gray bar along the top remains with no other visuals (other than a very thin gray bar along the bottom).

6. I run fbstatus and just have the gray bar. I Ctrl-C and now have the gokrazy screen

# /user/fbstatus
2025/07/07 18:54:30 opening next free console /dev/tty3
2025/07/07 18:54:30 framebuffer screeninfo: {Xres:1280 Yres:1024 Xres_virtual:1280 Yres_virtual:1024 Xoffset:0 Yoffset:0 Bits_per_pixel:32 Grayscale:0 Red:{Offset:16 Length:8 Right:0} Green:{Offset:8 Length:8 Right:0} Blue:{Offset:0 Length:8 Right:0} Transp:{Offset:0 Length:0 Right:0} Nonstd:0 Activate:0 Height:300 Width:380 Accel_flags:0 Pixclock:0 Left_margin:0 Right_margin:0 Upper_margin:0 Lower_margin:0 Hsync_len:0 Vsync_len:0 Sync:0 Vmode:0 Rotate:0 Colorspace:0 Reserved:[0 0 0 0]}
2025/07/07 18:54:30 font scale factor: 1
2025/07/07 18:54:30 gopher scaled in 29.244301ms
^C2025/07/07 18:54:37 context canceled

Hopefully that helps somewhat.