Red Hat Bugzilla – Bug 474376
i915: backlight and text consoles fail after suspend/resume
Last modified: 2009-07-14 13:46:28 EDT
Description of problem:
With all fedora 2.6.26 kernels, the text conosoles is lost after suspend/resume (they show up black but with the backlight on when switched to)
With all fedora 2.6.27 kernels (up to 18.104.22.168-41.fc9.i686) on resume, the backlight now fails to come on as well. The backlight can be switched on by doing a vt switch after resume, but the text consoles are still all black.
This problem happens whether the laptop is suspended from X using gnome power manager or manually from a console tty using echo mem > /sys/power/state.
Version-Release number of selected component (if applicable):
Performing the same test with the vanilla kernel (2.6.28-rc7) works perfectly (backlight is turned on when resuming and the text consoles work), so I suspect there's some problem with the massive drm-fedora9-rollup.patch in the kernel package.
Hopefully, the fedora kernel will get closer to vanilla in the coming updates, and this problem will fix itself.
Thanks for the bug report. We have reviewed the information you have provided above, and there is some additional information we require that will be helpful in our diagnosis of this issue.
Please attach your X server config file (/etc/X11/xorg.conf, if available) and X server log file (/var/log/Xorg.*.log) to the bug report as individual uncompressed file attachments using the bugzilla file attachment link below.
Reporter, do you have Desktop Effects on? For me it was the difference between working and non-working suspend.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 326331 [details]
Created attachment 326332 [details]
Created attachment 326333 [details]
i915 registers before suspend
Created attachment 326334 [details]
i915 registers after suspend
> Please attach your X server config file (/etc/X11/xorg.conf, if available)
> and X server log file (/var/log/Xorg.*.log) to the bug report as individual
> uncompressed file attachments using the bugzilla file attachment link below.
Um, well, I'd strongly advise, since upstream is fully working, simply to reroll the drm based on that.
However, if you want to debug the problem in the FC9 drm, the xorg files won't really help. The loss of the text consoles indicates tt's clearly a drm modesetting issue, so what you really need to diagnose it are the i915 registers before and after suspend, so I've attached those as well.
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