Red Hat Bugzilla – Bug 700542
[Sandybridge] Backlight power management ('dim screen to save power') not operating correctly
Last modified: 2012-08-06 15:58:46 EDT
Fedora 15 Beta, updates as of 28 April.
Screen settings are set to "Dim screen to save power".
This only appears to work if running from battery power, unlike F14.
Also, when you remove the power and the screen dims, mouse/keyboard input used to bring the screen back to the previous power level; it no-longer does this.
Similarly, when you plug the power back in, you do not get full backlight power.
Using the laptops brightness keys works at all times though.
I have the same issue, and also have an Intel graphics controller on my Lenovo T510.
Oops, I forgot to add my smolt ID: http://www.smolts.org/client/show/pub_545da922-c4ee-4d2b-ac62-0387875cd83c
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 add drm.debug=0x04 to the kernel command line, restart computer, and attach
* your X server config file (/etc/X11/xorg.conf, if available),
* X server log file (/var/log/Xorg.*.log)
* output of the dmesg command, and
* system log (/var/log/messages)
to the bug report as individual uncompressed file attachments using the bugzilla file attachment link above.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 495929 [details]
dmesg output with drm.debug=0x04
Created attachment 495930 [details]
/var/log/messages with drm.debug=0x04
Created attachment 495931 [details]
xorg log with drm.debug=0x04
I have no /etc/X11/xorg.conf file to upload.
I have what I think is the same issue. (Smolt profile provided below).
Here's what I'm experiencing. Regardless of whether the power is plugged in or not, the screen will dim after awhile. When on battery and the screen is dim, plugging in the power does not raise the brightness (I'm 99% positive F14 did this).
I will attach the requested files in a bit.
I just realized - I don't have a sandybridge device... However very similar behaviour... debug attachments coming.
Created attachment 498901 [details]
Created attachment 498902 [details]
/var/log/messages is empty??? not sure why.
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