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G4 12" display turns off after ~1min
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Daytona
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Joined: 01 Aug 2005
Posts: 55
Location: EN51vt

PostPosted: Sun Sep 12, 2021 10:35 pm    Post subject: G4 12" display turns off after ~1min Reply with quote

Hi all,

About a year ago, I finally got around to putting Gentoo on this G4 12" (Powerbook6,2) I've had for a while. After some battles mostly related to cross-compiling, it was a success.

Then it went on the shelf.

Now I want to use it, but am encountering a problem- the display turns itself off after around a minute, and does not come back on. It's still running as I can connect to it over SSH, but the display is totally dark.

The machine boots to console. X is not even installed.

This wasn't happening before as I did boot it on its' own, do an 'emerge --sync', and some other things when I last used it- all locally on the 'Book.

I've looked through the kernel config for something I missed, removed OF Framebuffer option per one post I found, and looking in dmesg nvidiafb appears to be working:
Code:

g4 ~ # dmesg|grep nvidiafb
[    0.543806] nvidiafb: Device ID: 10de0329
[    0.564739] nvidiafb: CRTC0 analog not found
[    0.588734] nvidiafb: CRTC1 analog not found
[    1.140763] nvidiafb: Found OF EDID for head 1
[    1.140778] nvidiafb: EDID found from BUS1
[    1.692764] nvidiafb: CRTC 1 is currently programmed for DFP
[    1.692777] nvidiafb: Using DFP on CRTC 1
[    1.692788] nvidiafb: Panel size is 1024 x 768
[    1.692797] nvidiafb: Panel is TMDS
[    1.694505] nvidiafb: Flat panel dithering enabled
[    1.700369] nvidiafb: PCI nVidia NV32 framebuffer (32MB @ 0xA0000000)


I also added 'video=nvidiafb:1024x768-32@60' to the kernel command line to no avail.

I found the Working 5.4.x kernel-config for PowerMac/PowerBook G4 thread and applied that config to 5.4.48 (the closest 5.4 I have available), but still the same.

Even the original 4.19.57 kernel exhibits the problem. So, I'm at a loss. Anybody have any ideas?
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Jaglover
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Joined: 29 May 2005
Posts: 8198
Location: Saint Amant, Acadiana

PostPosted: Mon Sep 13, 2021 2:11 am    Post subject: Reply with quote

Typical for CCFL backlights when they age. In other words, hardware issue.
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Daytona
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Joined: 01 Aug 2005
Posts: 55
Location: EN51vt

PostPosted: Wed Sep 15, 2021 12:05 am    Post subject: Reply with quote

That did occur to me, but I discounted it because
(a) while I haven't sat with a stopwatch and timed it, it does seem to be incredibly consistent- like 1 minute exactly. If I'm quick, I can log in and maybe run 1 command before it shuts off.
(b) If I shutdown -r now, the backlight comes back on

However, I just tried another test by booting into OpenFirmware and letting it sit, and sure enough the backlight shut off in the same amount of time. :(

I typed in mac-boot and by shining a flashlight down the screen I could see it booting.

So yes, unfortunately appears to be a hardware issue.

Any thoughts on whether it's the inverter board or the CCFL tube itself? If I can pick up one or the other cheap enough, might go for it.
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Jaglover
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Location: Saint Amant, Acadiana

PostPosted: Wed Sep 15, 2021 12:32 am    Post subject: Reply with quote

Lights, I think. Blown inverter won't come on at all. You may consider LED conversion. Takes less power and lasts forever.
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