Messages in this thread | | | Subject | Re: back light conflict i915 vs dell-laptop | From | Patrick Schaaf <> | Date | Sun, 28 Nov 2010 19:05:27 +0100 |
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On Thu, 2010-11-25 at 12:33 +0300, Dan Carpenter wrote: > Patrick Schaaf has reported that the i915 driver is setting his > backlight very dim when he starts GDM. > > https://bugzilla.kernel.org/show_bug.cgi?id=23472 > > It should be the dell-laptop platform driver controlling his backlight. > > Gnome tries to restore the backlight settings through the dell_laptop > interface in sysfs but it fails. (Because the platform hardware refuses > to set the settings to what it thinks they already are).
As far as my instrumentation showed, gnome did try no such thing - there were no setting calls through the backlight interface when I switch between the GDM screen and text console.
I have now run with drm.debug=0x07 and noticed get/set backlight PWM messages from intel_panel_get/set_backlight which became lower and lower in value for each successive switching between GDM login screen and text console, until reaching a low point and overflowing to 255255.
I append the extract of these kernel messages, as well as putting them in the bugzilla entry linked above.
Hope this helps clarify the problems I'm seeing.
best regards Patrick
Nov 28 18:43:17 lat1 kernel: [ 61.454973] [drm:intel_panel_get_backlight], get backlight PWM = 127500 Nov 28 18:43:17 lat1 kernel: [ 61.672115] [drm:intel_panel_set_backlight], set backlight PWM = 127500 Nov 28 18:43:25 lat1 kernel: [ 69.659366] [drm:intel_panel_get_backlight], get backlight PWM = 63627 Nov 28 18:43:25 lat1 kernel: [ 69.876223] [drm:intel_panel_set_backlight], set backlight PWM = 63627 Nov 28 18:45:02 lat1 kernel: [ 166.642624] [drm:intel_panel_get_backlight], get backlight PWM = 126735 Nov 28 18:45:02 lat1 kernel: [ 166.861225] [drm:intel_panel_set_backlight], set backlight PWM = 126735 Nov 28 18:45:06 lat1 kernel: [ 169.869343] [drm:intel_panel_get_backlight], get backlight PWM = 63246 Nov 28 18:45:06 lat1 kernel: [ 170.086225] [drm:intel_panel_set_backlight], set backlight PWM = 63246 Nov 28 18:50:24 lat1 kernel: [ 488.561922] [drm:intel_panel_get_backlight], get backlight PWM = 31563 Nov 28 18:50:24 lat1 kernel: [ 488.780228] [drm:intel_panel_set_backlight], set backlight PWM = 31563 Nov 28 18:50:29 lat1 kernel: [ 492.905273] [drm:intel_panel_get_backlight], get backlight PWM = 15776 Nov 28 18:50:29 lat1 kernel: [ 493.122220] [drm:intel_panel_set_backlight], set backlight PWM = 15776 Nov 28 18:50:45 lat1 kernel: [ 509.449869] [drm:intel_panel_get_backlight], get backlight PWM = 7888 Nov 28 18:50:45 lat1 kernel: [ 509.667228] [drm:intel_panel_set_backlight], set backlight PWM = 7888 Nov 28 18:50:48 lat1 kernel: [ 512.061427] [drm:intel_panel_get_backlight], get backlight PWM = 3944 Nov 28 18:50:48 lat1 kernel: [ 512.278220] [drm:intel_panel_set_backlight], set backlight PWM = 3944 Nov 28 18:50:54 lat1 kernel: [ 518.938610] [drm:intel_panel_get_backlight], get backlight PWM = 1972 Nov 28 18:50:55 lat1 kernel: [ 519.156232] [drm:intel_panel_set_backlight], set backlight PWM = 1972 Nov 28 18:50:58 lat1 kernel: [ 522.665295] [drm:intel_panel_get_backlight], get backlight PWM = 986 Nov 28 18:50:58 lat1 kernel: [ 522.883222] [drm:intel_panel_set_backlight], set backlight PWM = 986 Nov 28 18:51:04 lat1 kernel: [ 528.338612] [drm:intel_panel_get_backlight], get backlight PWM = 493 Nov 28 18:51:04 lat1 kernel: [ 528.557235] [drm:intel_panel_set_backlight], set backlight PWM = 493 Nov 28 18:51:07 lat1 kernel: [ 531.697225] [drm:intel_panel_get_backlight], get backlight PWM = 246 Nov 28 18:51:07 lat1 kernel: [ 531.915244] [drm:intel_panel_set_backlight], set backlight PWM = 246 Nov 28 18:51:20 lat1 kernel: [ 544.747370] [drm:intel_panel_get_backlight], get backlight PWM = 123 Nov 28 18:51:20 lat1 kernel: [ 544.965241] [drm:intel_panel_set_backlight], set backlight PWM = 123 Nov 28 18:51:24 lat1 kernel: [ 548.220386] [drm:intel_panel_get_backlight], get backlight PWM = 61 Nov 28 18:51:24 lat1 kernel: [ 548.437215] [drm:intel_panel_set_backlight], set backlight PWM = 61 Nov 28 18:51:31 lat1 kernel: [ 555.916888] [drm:intel_panel_get_backlight], get backlight PWM = 30 Nov 28 18:51:32 lat1 kernel: [ 556.134239] [drm:intel_panel_set_backlight], set backlight PWM = 30 Nov 28 18:51:35 lat1 kernel: [ 559.138346] [drm:intel_panel_get_backlight], get backlight PWM = 15 Nov 28 18:51:35 lat1 kernel: [ 559.355242] [drm:intel_panel_set_backlight], set backlight PWM = 15 Nov 28 18:51:40 lat1 kernel: [ 564.929606] [drm:intel_panel_get_backlight], get backlight PWM = 7 Nov 28 18:51:41 lat1 kernel: [ 565.148225] [drm:intel_panel_set_backlight], set backlight PWM = 7 Nov 28 18:51:45 lat1 kernel: [ 569.509391] [drm:intel_panel_get_backlight], get backlight PWM = 3 Nov 28 18:51:45 lat1 kernel: [ 569.726226] [drm:intel_panel_set_backlight], set backlight PWM = 3 Nov 28 18:51:52 lat1 kernel: [ 576.103569] [drm:intel_panel_get_backlight], get backlight PWM = 1 Nov 28 18:51:52 lat1 kernel: [ 576.322226] [drm:intel_panel_set_backlight], set backlight PWM = 1 Nov 28 18:51:56 lat1 kernel: [ 579.760386] [drm:intel_panel_get_backlight], get backlight PWM = 0 Nov 28 18:51:56 lat1 kernel: [ 579.977224] [drm:intel_panel_set_backlight], set backlight PWM = 255255 Nov 28 18:52:12 lat1 kernel: [ 596.022674] [drm:intel_panel_get_backlight], get backlight PWM = 127500 Nov 28 18:52:12 lat1 kernel: [ 596.241232] [drm:intel_panel_set_backlight], set backlight PWM = 127500 Nov 28 18:52:15 lat1 kernel: [ 599.502386] [drm:intel_panel_get_backlight], get backlight PWM = 63627 Nov 28 18:52:15 lat1 kernel: [ 599.719217] [drm:intel_panel_set_backlight], set backlight PWM = 63627
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