Red Hat Bugzilla – Bug 250967
Display brightness adjusts itself after resuming from suspend state
Last modified: 2013-03-05 22:51:53 EST
Description of problem:
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Suspend laptop
2. Resume from suspend
Display brightens slowly to maximum by itself
Display brightness should stay still
Happens only after resuming from suspend. Does not happen after resuming from
hibernate. Restarting X server helps.
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express
Processor to DRAM Controller (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML
Express Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express
Graphics Controller (rev 03)
Distro version: Fedora release 7 (Moonshine)
Kernel version: 184.108.40.206-41.fc7
HAL version: 0.5.9
System manufacturer: Dell Inc.
System version: missing
System product: Latitude D410
AC adapter present: yes
Battery present: yes
Laptop panel present: yes
CPU scaling present: yes
battery.alarm.design = 480 (0x1e0) (int)
battery.alarm.unit = 'mAh' (string)
battery.charge_level.capacity_state = 'ok' (string)
battery.charge_level.current = 29892 (0x74c4) (int)
battery.charge_level.design = 53280 (0xd020) (int)
battery.charge_level.granularity_1 = 532 (0x214) (int)
battery.charge_level.granularity_2 = 532 (0x214) (int)
battery.charge_level.last_full = 34798 (0x87ee) (int)
battery.charge_level.low = 1609 (0x649) (int)
battery.charge_level.percentage = 85 (0x55) (int)
battery.charge_level.rate = 12842 (0x322a) (int)
battery.charge_level.unit = 'mWh' (string)
battery.charge_level.warning = 5328 (0x14d0) (int)
battery.is_rechargeable = true (bool)
battery.model = 'DELL X53086' (string)
battery.present = true (bool)
battery.rechargeable.is_charging = true (bool)
battery.rechargeable.is_discharging = false (bool)
battery.remaining_time = 1375 (0x55f) (int)
battery.reporting.current = 2693 (0xa85) (int)
battery.reporting.design = 4800 (0x12c0) (int)
battery.reporting.granularity_1 = 48 (0x30) (int)
battery.reporting.granularity_2 = 48 (0x30) (int)
battery.reporting.last_full = 3135 (0xc3f) (int)
battery.reporting.low = 145 (0x91) (int)
battery.reporting.rate = 1157 (0x485) (int)
battery.reporting.technology = 'LION' (string)
battery.reporting.unit = 'mAh' (string)
battery.reporting.warning = 480 (0x1e0) (int)
battery.serial = '10516' (string)
battery.technology = 'lithium-ion' (string)
battery.type = 'primary' (string)
battery.vendor = 'Sony' (string)
battery.voltage.current = 12846 (0x322e) (int)
battery.voltage.design = 11100 (0x2b5c) (int)
battery.voltage.unit = 'mV' (string)
battery.present = false (bool)
battery.type = 'primary' (string)
I have a similar issue on my Dell Latitude X1 which uses the same graphics card.
I am not seeing this gradual increase of back light, it seems to simply awake
at max brightness.
A work around is described in this bug comment:
It involves going to the VT1 terminal and then coming back to the X server. I
do not have to toggle the CTR/LCD function in order for this to work. If I do
not toggle the CTR/LCD sometimes I return to an "off" back light in the X
server. The back light function keys are enabled at this point though, increase
the brightness to turn on the back light.
I don't completely understand it, and I don't know where to look in GPM but it
is an annoying little bug I'd like to track down and have fixed.
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