Seth Forshee <[email protected]> writes:
> It's hard to tell much from your ACPI tables, essentially they just seem
> to be handing everything off to the embedded controller. We'll have to
> experiment a little.
[...]
On first boot.
| root@ornery:/sys/class/backlight# ls -l
| total 0
| lrwxrwxrwx 1 root root 0 Feb 21 18:33 acpi_video0 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
| lrwxrwxrwx 1 root root 0 Feb 21 18:33 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight
| lrwxrwxrwx 1 root root 0 Feb 21 18:33 toshiba ->
../../devices/LNXSYSTM:00/device:00/TOS6208:00/backlight/toshiba
| root@ornery:/sys/class/backlight#
Default levels (maximum brightness) after first boot:
| root@ornery:/sys/class/backlight# for i in *; do for j in brightness
actual_brightness max_brightness; do echo -n ${i}/${j}: ; cat ${i}/${j}; done;
echo; done
| acpi_video0/brightness:7
| acpi_video0/actual_brightness:7
| acpi_video0/max_brightness:7
|
| intel_backlight/brightness:4539
| intel_backlight/actual_brightness:4539
| intel_backlight/max_brightness:4539
|
| toshiba/brightness:7
| toshiba/actual_brightness:7
| toshiba/max_brightness:7
|
| root@ornery:/sys/class/backlight#
After pressing 'Fn-F6' (decrease brightness):
| root@ornery:/sys/class/backlight# for i in *; do for j in brightness
actual_brightness max_brightness; do echo -n ${i}/${j}: ; cat ${i}/${j}; done;
echo; done
| acpi_video0/brightness:5
| acpi_video0/actual_brightness:5
| acpi_video0/max_brightness:7
|
| intel_backlight/brightness:4539
| intel_backlight/actual_brightness:2723
| intel_backlight/max_brightness:4539
|
| toshiba/brightness:7
| toshiba/actual_brightness:5
| toshiba/max_brightness:7
|
| root@ornery:/sys/class/backlight#
I put the brightness back to maxmium, and then suspended and resumed. I
then tried 'Fn-F6' (decrease brightness) again:
| root@ornery:/sys/class/backlight# for i in *; do for j in brightness
actual_brightness max_brightness; do echo -n ${i}/${j}: ; cat ${i}/${j}; done;
echo; done
| acpi_video0/brightness:5
| acpi_video0/actual_brightness:5
| acpi_video0/max_brightness:7
|
| intel_backlight/brightness:4539
| intel_backlight/actual_brightness:4539
^^^^
| intel_backlight/max_brightness:4539
|
| toshiba/brightness:7
| toshiba/actual_brightness:5
| toshiba/max_brightness:7
|
| root@ornery:/sys/class/backlight#
Interesting, let's try setting that manually:
| root@ornery:/sys/class/backlight# echo 2723 >
intel_backlight/brightness
And the brightness decreases...
| root@ornery:/sys/class/backlight# for i in *; do for j in brightness
actual_brightness max_brightness; do echo -n ${i}/${j}: ; cat ${i}/${j}; done;
echo; done
| acpi_video0/brightness:5
| acpi_video0/actual_brightness:5
| acpi_video0/max_brightness:7
|
| intel_backlight/brightness:2723
| intel_backlight/actual_brightness:2723
| intel_backlight/max_brightness:4539
|
| toshiba/brightness:7
| toshiba/actual_brightness:5
| toshiba/max_brightness:7
|
| root@ornery:/sys/class/backlight#
Please let me know if this is enough, or if you need more information.
--
James
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https://bugs.launchpad.net/bugs/935778
Title:
Toshiba R840 - brightness controls work on first boot, but do nothing
after suspend/resume
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