https://bugzilla.novell.com/show_bug.cgi?id=887629
https://bugzilla.novell.com/show_bug.cgi?id=887629#c2
--- Comment #2 from David Rankin 2014-07-18 00:24:03 UTC ---
I have tried to summarize boot entries related to video card initialization
and backlight control from both the 11.4 dmesg output and 13.1 journalctl. The
full output is contained in the attachment posted earlier. Both appear to
register the backlight control, but 11.4 assigns acpi device:27 and the result
is backlight control works. 13.1 appears to do the same thing, but has
additional entries not present in 11.4. Whatever 13.1 is doing, the backlight
control does not work in 13.1. Here is a summary of related entries from the
11.4 dmesg file:
[ 2.936191] radeon 0000:01:05.0: power state changed by ACPI to D0
[ 2.936200] radeon 0000:01:05.0: power state changed by ACPI to D0
[ 2.936210] radeon 0000:01:05.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
Later initializing Radeon Display Connection, 11.4 does the following:
[ 2.956647] [drm] Radeon Display Connectors
[ 2.956650] [drm] Connector 0:
[ 2.956652] [drm] VGA
[ 2.956654] [drm] DDC: 0x7e50 0x7e40 0x7e54 0x7e44 0x7e58 0x7e48 0x7e5c
0x7e4c
[ 2.956657] [drm] Encoders:
[ 2.956658] [drm] CRT1: INTERNAL_KLDSCP_DAC1
[ 2.956660] [drm] Connector 1:
[ 2.956662] [drm] LVDS
[ 2.956664] [drm] DDC: 0x7e40 0x7e50 0x7e44 0x7e54 0x7e48 0x7e58 0x7e4c
0x7e5c
[ 2.956666] [drm] Encoders:
[ 2.956668] [drm] LCD1: INTERNAL_LVTM1
[ 2.956670] [drm] Connector 2:
[ 2.956671] [drm] S-video
[ 2.956673] [drm] Encoders:
[ 2.956674] [drm] TV1: INTERNAL_KLDSCP_DAC1
[ 3.510984] [drm] fb mappable at 0xF0040000
[ 3.510988] [drm] vram apper at 0xF0000000
[ 3.510990] [drm] size 5300224
[ 3.510992] [drm] fb depth is 24
[ 3.510994] [drm] pitch is 5888
Then the backlight is initially set in 11.4:
[ 11.641707] [Firmware Bug]: ACPI: No _BQC method, cannot determine initial
brightness
[ 11.645898] acpi device:27: registered as cooling_device2
[ 11.646134] input: Video Bus as
/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:25/LNXVIDEO:01/input/input6
[ 11.646216] ACPI: Video Device [VGA1] (multi-head: yes rom: no post: no)
There are no further entries in 11.4 that I could find. In the 13.1 output,
after entries similar to 11.4, 13.1 appears to initialize 'radeon atom DIG
backlight initialized' (which may be what 11.4 does), but it is not working:
Jul 16 15:52:27 alchemy kernel: ohci-pci 0000:00:13.0: irq 16, io mem
0xf8704000
Jul 16 15:52:27 alchemy kernel: [drm] radeon atom DIG backlight initialized
Jul 16 15:52:27 alchemy kernel: [drm] Radeon Display Connectors
Jul 16 15:52:27 alchemy kernel: [drm] Connector 0:
Jul 16 15:52:27 alchemy kernel: [drm] VGA-1
Jul 16 15:52:27 alchemy kernel: [drm] DDC: 0x7e50 0x7e40 0x7e54 0x7e44 0x7e58
0x7e48 0x7e5c 0x7e4c
Jul 16 15:52:27 alchemy kernel: [drm] Encoders:
Jul 16 15:52:27 alchemy kernel: [drm] CRT1: INTERNAL_KLDSCP_DAC1
Jul 16 15:52:27 alchemy kernel: [drm] Connector 1:
Jul 16 15:52:27 alchemy kernel: [drm] LVDS-1
Jul 16 15:52:27 alchemy kernel: [drm] DDC: 0x7e40 0x7e50 0x7e44 0x7e54 0x7e48
0x7e58 0x7e4c 0x7e5c
Jul 16 15:52:27 alchemy kernel: [drm] Encoders:
Jul 16 15:52:27 alchemy kernel: [drm] LCD1: INTERNAL_LVTM1
Jul 16 15:52:27 alchemy kernel: [drm] Connector 2:
Jul 16 15:52:27 alchemy kernel: [drm] SVIDEO-1
Jul 16 15:52:27 alchemy kernel: [drm] Encoders:
Jul 16 15:52:27 alchemy kernel: [drm] TV1: INTERNAL_KLDSCP_DAC1
The 13.1 entries to initialize backlight control are almost identical to
11.4, but entries are in a different order:
Jul 16 15:52:28 alchemy kernel: [Firmware Bug]: ACPI: No _BQC method, cannot
determine initial brightness
Jul 16 15:52:28 alchemy kernel: acpi device:27: registered as cooling_device2
Jul 16 15:52:28 alchemy kernel: ACPI: Video Device [VGA1] (multi-head: yes
rom: no post: no)
Jul 16 15:52:28 alchemy kernel: input: Video Bus as
/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:25/LNXVIDEO:01/input/input6
Jul 16 15:52:28 alchemy kernel: ACPI: Deprecated procfs I/F for AC is loaded,
please retry with CONFIG_ACPI_PROCFS_POWER cleared
Hopefully this will help. Let me know if you need additional information.
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