Hi,
i've got the same problem with my Toshiba L850D, except that backlight had
worked before kernel 3.5.x.
I tried with kernel 3.5.0-17 (default 12.10 configuration) and kernel ppa 3.6.5
with fglrx drivers (required to select the right AMD A8 GPU).
Backlight keys work (I get the slider) , but there is no change on
backlight screen.
I try to change value directly in /sys/class/backlight/acpi_vgaX/brightness :
- I've got 2 directory acpi_vga0 and acpi_vga1 for the 2 radeon GPU
so i test on this two ones, the result is the same, no changes on
backlight screen
- I get the right value on /sys/class/backlight/acpi_vgaX/actual_brightness
On dmesg, i had this 2 errors, but they don't seem to be related to backlight
variable _BCL :
[ 30.212195] ACPI Error: Method parse/execution failed [\_SB_.PCI0.VGA_.AF03]
(Node ffff8801a665c000), AE_AML_INFINITE_LOOP (20120711/psparse-536)
[ 30.212214] ACPI Error: Method parse/execution failed [\_SB_.PCI0.VGA_.ATIF]
(Node ffff8801a665ad98), AE_AML_INFINITE_LOOP (20120711/psparse-536)
In result.log :
PASSED: Test 88, Method _BCL returned a sane package of 10 integers.
PASSED: Test 88, \_SB_.PCI0.PB3_.VGA_.LCD_._BCL correctly acquired and released
locks 5 times.
Test 89 of 94: Check _BCM (Set Brightness Level).
ACPICA Exception AE_AML_PACKAGE_LIMIT during execution of method BLMP
FAILED [CRITICAL] AEAMLPackgeLimit: Test 89, Detected error 'Package limit'
when evaluating
'\_SB_.PCI0.VGA_.LCD_._BCM'.
PASSED: Test 89, \_SB_.PCI0.VGA_.LCD_._BCM correctly acquired and released
locks 7 times.
ACPICA Exception AE_AML_PACKAGE_LIMIT during execution of method BLMP
FAILED [CRITICAL] AEAMLPackgeLimit: Test 89, Detected error 'Package limit'
when evaluating
'\_SB_.PCI0.PB2_.VGA_.LCD_._BCM'.
PASSED: Test 89, \_SB_.PCI0.PB2_.VGA_.LCD_._BCM correctly acquired and released
locks 7 times.
ACPICA Exception AE_AML_PACKAGE_LIMIT during execution of method BLMP
FAILED [CRITICAL] AEAMLPackgeLimit: Test 89, Detected error 'Package limit'
when evaluating
'\_SB_.PCI0.PB3_.VGA_.LCD_._BCM'.
PASSED: Test 89, \_SB_.PCI0.PB3_.VGA_.LCD_._BCM correctly acquired and released
locks 7 times.
Critical failures: 16
...
method: Detected error 'Package limit' when evaluating
'\_SB_.PCI0.VGA_.LCD_._BCM'.
method: Detected error 'Package limit' when evaluating
'\_SB_.PCI0.PB2_.VGA_.LCD_._BCM'.
method: Detected error 'Package limit' when evaluating
'\_SB_.PCI0.PB3_.VGA_.LCD_._BCM'.
DSDT.dsl in attachment
hope this help,
bruno
** Attachment added: "my DSDT file"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/971750/+attachment/3423445/+files/DSDT.dsl
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https://bugs.launchpad.net/bugs/971750
Title:
Toshiba L735-101 screen brightness cannot be set using hotkeys
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