[SOLVED] Suspend to RAM, Resume and Console problem

[dziadu]

Hi,

since last upgrade I've made last weekend I have serious problem with hibernation.

I am using KDE. After closing the lid laptop is going to suspend properly, and it was like that always. After opening the lid laptop is starting resume, I see disk working and so on. But screen stays black. There is no chance to get system working properly.

Now there are three possibilities:
1. System is stable but doesn't react. Pressing Power button causes closing the system. Sometimes after restart system inform about not clean disk and force checking, sometimes disk is OK.
2. Systems looks like frozen, pressing Power button doesn't change anything, I must hold down Power for longer time to really switch off laptop.
3. System trying to fight against evil forces, screen is blinking (sometimes you can see this when there is problem with X and it tries do something) and laptop restarts automatically after some time.

But I discovered three other issues:
1. When before hibernation I go to text mode and I switch off X

[Hu]

Does it work if you blacklist the nVidia drivers from loading (or even better, temporarily unmerge them), reboot, and then test? This is necessary to get an untainted kernel, since unloading the nVidia driver is not guaranteed to undo any changes it may have made during its initialization phase.

[dziadu]

I tried this also - I removed module completely from the disk and restarted machine. Doesn't help.
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[Hu]

With the module removed, it behaves as in item #3? The system resumes, but the kernel is unable to driver the console? Did you enable Nouveau and the framebuffer console or are you using the legacy VGA text console?

[dziadu]

Yes, when I run without nvidia module, then I just see black screen, no access to console, obviously no X start.

But another interesting issue:

If I resume after point 2. (when X server was off before suspend) and I switch to text mode, even if I see black screen I can use terminal. I can login as an user, I can switch to superuser (su) and then I can reboot and machine happily restarts. I can also restart X-server and back to KDE.

From my kernel config:

[toralf]

In the past I suffered from a black (KDE) screen after resume - work around was to press Ctrl+Alt+F12 and Ctrl+Alt+F7

[Hu]

Some BIOS vendors do not properly reinitialize the graphics card on resume, in which case the kernel must do so. This usually requires card-specific handling, meaning either Nouveau or the nVidia driver should do it. Installing both at once is a very bad idea. It looks like you took my advice to remove the nVidia blob, but did not add Nouveau, so now you have no drivers that know how to activate your video card.

[dziadu]

@Hu,

bit it was working week ago on older kernel, today it doesn't work on any old kernel version.

Also in the past when I didn't have both nvidia and nouveau, hibernation was working fine. Doesn't matter which kernel I use, which card driver I use, something is wrong with the console. And I don't want install nouveau.
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[Hu]

When you switched to the older kernel, did you also install the corresponding pre-upgrade nVidia drivers? The nVidia drivers have a huge kernel module, so if the nVidia upgrade is what broke your sleep support, then switching back to the old kernel is insufficient. As far as I know, most nVidia cards require kernel assistance to resume from sleep. That assistance is provided by Nouveau or by nVidia's proprietary drivers.

[dziadu]

Well hu, I must apologize you, I was so stubborn, but you were right with the driver. Downgrade to 295.95 solved the problem. Now I am thinking if I should report bug with nvidia-driver-302.17 to bugzilla.
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