http://bugzilla.kernel.org/show_bug.cgi?id=12174
Summary: No backlight control on Samsung x360
Product: Drivers
Version: 2.5
KernelVersion: 2.6.28-rc8
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI)
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version: 2.6.26
Earliest failing kernel version:
Distribution: Debian/Unstable+Experimental
Hardware Environment:Samsung x360, GMA X4500
Problem Description:
I cant control the brightness of the backlight with a
2.6.28-rc7. It worked under mysterious circumstances with a 2.6.26.
Mysterious, because i had to use /proc/acpi/video/NVID/LCD/brightness to set
it, which obviously belongs to a nvidia driver (but theres nothing from
nvidia in here...)
I have no hardware brightness control here, the keys for brightness up/down and
disable backlight just send keycodes like:
atkbd.c: Unknown key pressed (translated set 2, code 0x83 on isa0060/serio0).
atkbd.c: Use 'setkeycodes e003 <keycode>' to make it known.
Some output you might be interessted in:
# lspci -vxxx -s 00:02.0
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
Subsystem: Samsung Electronics Co Ltd Device c03e
Flags: bus master, fast devsel, latency 0, IRQ 316
Memory at fc000000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 1800 [size=8]
Capabilities: [90] Message Signalled Interrupts: Mask- 64bit-
Queue=0/0 Enable+
Capabilities: [d0] Power Management version 3
00: 86 80 42 2a 07 04 90 00 07 00 00 03 00 00 80 00
10: 04 00 00 fc 00 00 00 00 0c 00 00 d0 00 00 00 00
20: 01 18 00 00 00 00 00 00 00 00 00 00 4d 14 3e c0
30: 00 00 00 00 90 00 00 00 00 00 00 00 0b 01 00 00
40: 00 00 00 00 48 00 00 00 09 00 0a 11 88 70 00 1e
50: 01 80 50 03 19 00 00 00 00 00 00 00 00 00 00 be
60: 00 00 00 00 00 00 02 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
90: 05 d0 01 00 0c 30 e0 fe 81 41 00 00 00 00 00 00
a0: 00 00 00 00 09 00 06 20 00 00 00 00 00 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 40 01 00 00
d0: 01 00 23 00 00 00 00 00 00 00 00 00 34 00 00 00
e0: 00 00 00 00 00 00 00 00 00 80 00 1a 41 20 00 00
f0: 09 08 34 07 ff 00 00 00 a0 0f 07 00 20 10 b6 bd
# cat /proc/dri/0/i915_gem_interrupt
Interrupt enable: 00000053
Interrupt identity: 00000000
Interrupt mask: fffedfae
Pipe A stat: 00040000
Pipe B stat: 00400206
Interrupts received: 41
Current sequence: 180
Waiter sequence: 0
IRQ sequence: 92
Matthew Garrett asked me to do this:
> Does writing a value into the /sys/class/backlight
> interface result in an interrupt in the i915_gem_interrupts file?
Before:
# cat /proc/dri/0/i915_gem_interrupt
Interrupt enable: 00000053
Interrupt identity: 00000000
Interrupt mask: fffedfae
Pipe A stat: 00040000
Pipe B stat: 00400206
Interrupts received: 336
Current sequence: 13742
Waiter sequence: 0
IRQ sequence: 260
after
# echo 5 > /sys/class/backlight/acpi_video0/brightness
# cat /proc/dri/0/i915_gem_interrupt
Interrupt enable: 00000053
Interrupt identity: 00000000
Interrupt mask: fffedfae
Pipe A stat: 00040000
Pipe B stat: 00400206
Interrupts received: 336
Current sequence: 13836
Waiter sequence: 0
IRQ sequence: 260
Best regards,
Matthias
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