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Subjecti915/kms/backlight-combo mode problem (was: Re: Linux 2.6.39-rc5)
Hi,

I have the problem described in the thread here
(https://lkml.org/lkml/2011/4/29/217) where the backlight
values are reversed so although stuff is displayed on the screen, the
backlight is off. This occurs with kernels from about 2.6.39 onwards.

After booting a "broken" kernel (>~2.6.39), the backlight can be lit
temporarily with:
setpci -s 00:02.0 F4.B=0
and then turned off with:
setpci -s 00:02.0 F4.B=FF

Yesterday I tried this patch, https://lkml.org/lkml/2011/4/30/37 by
manually applying it to the 3.2.1
kernel source - this fixes the problem.

** Unfortunately the LKML thread stops after this patch and given that
the problem is still present in the latest source, this code wasn't
pushed into the kernel. Is there a reason for this or was it just
forgotten about? What can I do about this? I am happy to make a git
patch with the latest source if this will help.

If it is relevant, the backlight brightness controls (Fn-left, Fn-right)
have never worked on any kernel
version, although they are picked up by acpi_listen.

The machine is a Packard Bell XS butterfly laptop, 11.6", 1.3GHz celeron
743, 2gb ram, etc.
As per the posting guidelines, here is loads of info about it:

# dmesg|grep acer
[ 9.820622] acer_wmi: Acer Laptop ACPI-WMI Extras
[ 9.821841] acer_wmi: Function bitmap for Communication Device: 0x81
[ 9.822005] acer_wmi: Brightness must be controlled by generic video
driver


# lspci -v

00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory
Controller Hub (rev 07)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0a <?>
Kernel driver in use: agpgart-intel

00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series
Chipset Integrated Graphics Controller (rev 07) (prog-if 00 [VGA
controller])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, fast devsel, latency 0, IRQ 47
Memory at 90000000 (64-bit, non-prefetchable) [size=4M]
Memory at 80000000 (64-bit, prefetchable) [size=256M]
I/O ports at 50d0 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 3
Kernel driver in use: i915
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, fast devsel, latency 0
Memory at 93400000 (64-bit, non-prefetchable) [size=1M]
Capabilities: [d0] Power Management version 3
00:1a.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #4 (rev 03) (prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, medium devsel, latency 0, IRQ 20
I/O ports at 50a0 [size=32]
Capabilities: [50] PCI Advanced Features
Kernel driver in use: uhci_hcd

00:1a.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #2 (rev 03) (prog-if 20 [EHCI])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, medium devsel, latency 0, IRQ 21
Memory at 96705c00 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd

00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio
Controller (rev 03)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at 96700000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 2
Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [100] Virtual Channel
Capabilities: [130] Root Complex Link
Kernel driver in use: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 1 (rev 03) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 00004000-00004fff
Memory behind bridge: 95700000-966fffff
Prefetchable memory behind bridge:
0000000090400000-00000000913fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 034b
Capabilities: [a0] Power Management version 2
Capabilities: [100] Virtual Channel
Capabilities: [180] Root Complex Link
Kernel driver in use: pcieport
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 2 (rev 03) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=04, subordinate=04, sec-latency=0
I/O behind bridge: 00003000-00003fff
Memory behind bridge: 94600000-956fffff
Prefetchable memory behind bridge:
0000000091400000-00000000923fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 034b
Capabilities: [a0] Power Management version 2
Capabilities: [100] Virtual Channel
Capabilities: [180] Root Complex Link
Kernel driver in use: pcieport
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express
Port 3 (rev 03) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=05, subordinate=05, sec-latency=0
I/O behind bridge: 00001000-00002fff
Memory behind bridge: 93500000-945fffff
Prefetchable memory behind bridge:
0000000092400000-00000000933fffff
Capabilities: [40] Express Root Port (Slot+), MSI 00
Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [90] Subsystem: Acer Incorporated [ALI] Device 034b
Capabilities: [a0] Power Management version 2
Capabilities: [100] Virtual Channel
Capabilities: [180] Root Complex Link
Kernel driver in use: pcieport
00:1d.0 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #1 (rev 03) (prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: medium devsel, IRQ 23
I/O ports at 5080 [size=32]
Capabilities: [50] PCI Advanced Features
Kernel driver in use: uhci_hcd

00:1d.1 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #2 (rev 03) (prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: medium devsel, IRQ 19
I/O ports at 5060 [size=32]
Capabilities: [50] PCI Advanced Features
Kernel driver in use: uhci_hcd

00:1d.2 USB controller: Intel Corporation 82801I (ICH9 Family) USB UHCI
Controller #3 (rev 03) (prog-if 00 [UHCI])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, medium devsel, latency 0, IRQ 20
I/O ports at 5040 [size=32]
Capabilities: [50] PCI Advanced Features
Kernel driver in use: uhci_hcd

00:1d.7 USB controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI
Controller #1 (rev 03) (prog-if 20 [EHCI])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: medium devsel, IRQ 23
Memory at 96705800 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port: BAR=1 offset=00a0
Capabilities: [98] PCI Advanced Features
Kernel driver in use: ehci_hcd

00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
(prog-if 01 [Subtractive decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=06, subordinate=06, sec-latency=32
Capabilities: [50] Subsystem: Acer Incorporated [ALI] Device 034b

00:1f.0 ISA bridge: Intel Corporation ICH9M-E LPC Interface Controller
(rev 03)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, medium devsel, latency 0
Capabilities: [e0] Vendor Specific Information: Len=0c <?>

00:1f.2 SATA controller: Intel Corporation 82801IBM/IEM (ICH9M/ICH9M-E)
4 port SATA Controller [AHCI mode] (rev 03) (prog-if 01 [AHCI 1.0])
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 43
I/O ports at 50c8 [size=8]
I/O ports at 50dc [size=4]
I/O ports at 50c0 [size=8]
I/O ports at 50d8 [size=4]
I/O ports at 5020 [size=32]
Memory at 96705000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [80] MSI: Enable+ Count=1/16 Maskable- 64bit-
Capabilities: [70] Power Management version 3
Capabilities: [a8] SATA HBA v1.0
Capabilities: [b0] PCI Advanced Features
Kernel driver in use: ahci

00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller
(rev 03)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: medium devsel, IRQ 18
Memory at 96706000 (64-bit, non-prefetchable) [size=256]
I/O ports at 5000 [size=32]
Kernel driver in use: i801_smbus

00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9
Family) Thermal Subsystem (rev 03)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: fast devsel, IRQ 11
Memory at 96704000 (64-bit, non-prefetchable) [size=4K]
Capabilities: [50] Power Management version 3

04:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN
Flags: bus master, fast devsel, latency 0, IRQ 44
Memory at 94600000 (64-bit, non-prefetchable) [size=8K]
Capabilities: [c8] Power Management version 3
Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [e0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Device Serial Number 00-1e-64-ff-ff-3a-4c-ec
Kernel driver in use: iwlwifi
05:00.0 Ethernet controller: Atheros Communications Inc. AR8131 Gigabit
Ethernet (rev c0)
Subsystem: Acer Incorporated [ALI] Device 034b
Flags: bus master, fast devsel, latency 0, IRQ 46
Memory at 93500000 (64-bit, non-prefetchable) [size=256K]
I/O ports at 1000 [size=128]
Capabilities: [40] Power Management version 3
Capabilities: [48] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [58] Express Endpoint, MSI 00
Capabilities: [6c] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [180] Device Serial Number ff-0b-61-4b-70-5a-b6-ff
Kernel driver in use: atl1c

# cat /proc/cpuinfo

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 23
model name : Intel(R) Celeron(R) CPU 743 @ 1.30GHz
stepping : 10
microcode : 0xa07
cpu MHz : 1296.810
cache size : 1024 KB
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss tm pbe syscall
nx lm constant_tsc up arch_perfmon pebs bts rep_good nopl aperfmperf pni
dtes64 monitor ds_cpl tm2 ssse3 cx16 xtpr pdcm xsave lahf_lm dts
bogomips : 2593.62
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:


# cat /proc/modules

aes_x86_64 7760 3 - Live 0xffffffffa0089000
aes_generic 27055 1 aes_x86_64, Live 0xffffffffa007f000
mperf 1429 0 - Live 0xffffffffa0075000
cpufreq_userspace 2152 0 - Live 0xffffffffa0071000
cpufreq_powersave 994 0 - Live 0xffffffffa006d000
cpufreq_stats 3093 0 - Live 0xffffffffa0069000
cpufreq_conservative 5057 0 - Live 0xffffffffa0035000
bluetooth 78815 2 - Live 0xffffffffa0002000
i915 376275 2 - Live 0xffffffffa0721000
drm_kms_helper 28203 1 i915, Live 0xffffffffa0714000
drm 199595 3 i915,drm_kms_helper, Live 0xffffffffa06cd000
i2c_algo_bit 4834 1 i915, Live 0xffffffffa06c8000
uinput 6725 1 - Live 0xffffffffa06c3000
fuse 58861 1 - Live 0xffffffffa06ac000
nfsd 212927 2 - Live 0xffffffffa066a000
exportfs 3447 1 nfsd, Live 0xffffffffa0666000
nfs 264646 0 - Live 0xffffffffa0610000
lockd 66446 2 nfsd,nfs, Live 0xffffffffa05f7000
fscache 41009 1 nfs, Live 0xffffffffa05e4000
auth_rpcgss 37737 2 nfsd,nfs, Live 0xffffffffa05d4000
nfs_acl 2317 2 nfsd,nfs, Live 0xffffffffa05d0000
sunrpc 196478 6 nfsd,nfs,lockd,auth_rpcgss,nfs_acl, Live 0xffffffffa058a000
loop 15447 0 - Live 0xffffffffa0582000
joydev 9152 0 - Live 0xffffffffa057c000
snd_hda_codec_hdmi 22257 1 - Live 0xffffffffa0571000
snd_hda_codec_realtek 197108 1 - Live 0xffffffffa0536000
arc4 1353 2 - Live 0xffffffffa0532000
snd_hda_intel 23473 3 - Live 0xffffffffa0526000
snd_hda_codec 93483 3
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel, Live
0xffffffffa0501000
snd_hwdep 5752 1 snd_hda_codec, Live 0xffffffffa04fb000
snd_pcm 73041 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec, Live
0xffffffffa04df000
snd_seq 46164 0 - Live 0xffffffffa04cc000
snd_timer 18682 2 snd_pcm,snd_seq, Live 0xffffffffa04c2000
snd_seq_device 5829 1 snd_seq, Live 0xffffffffa04bd000
iwlwifi 165948 0 - Live 0xffffffffa0487000
snd 60683 15
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_seq,snd_timer,snd_seq_device,
Live 0xffffffffa046e000
uvcvideo 53221 0 - Live 0xffffffffa045c000
soundcore 6558 1 snd, Live 0xffffffffa0456000
videodev 79468 1 uvcvideo, Live 0xffffffffa0439000
mac80211 201126 1 iwlwifi, Live 0xffffffffa03f6000
i2c_i801 7770 0 - Live 0xffffffffa03f0000
psmouse 56724 0 - Live 0xffffffffa03da000
cfg80211 146500 2 iwlwifi,mac80211, Live 0xffffffffa03a8000
iTCO_wdt 12072 0 - Live 0xffffffffa03a0000
acer_wmi 20155 0 - Live 0xffffffffa0396000
v4l2_compat_ioctl32 7727 1 videodev, Live 0xffffffffa0391000
mxm_wmi 1851 0 - Live 0xffffffffa038d000
sparse_keymap 3594 1 acer_wmi, Live 0xffffffffa0389000
iTCO_vendor_support 2797 1 iTCO_wdt, Live 0xffffffffa0385000
pcspkr 1830 0 - Live 0xffffffffa0381000
evdev 8569 16 - Live 0xffffffffa0373000
serio_raw 4177 0 - Live 0xffffffffa036e000
i2c_core 23165 6 i915,drm_kms_helper,drm,i2c_algo_bit,videodev,i2c_i801,
Live 0xffffffffa0362000
snd_page_alloc 7422 2 snd_hda_intel,snd_pcm, Live 0xffffffffa035c000
rfkill 16037 4 bluetooth,cfg80211,acer_wmi, Live 0xffffffffa0353000
wmi 9150 2 acer_wmi,mxm_wmi, Live 0xffffffffa0345000
battery 6802 0 - Live 0xffffffffa0340000
ac 2438 0 - Live 0xffffffffa033c000
button 5105 1 i915, Live 0xffffffffa032f000
video 12154 1 i915, Live 0xffffffffa0327000
processor 27867 1 - Live 0xffffffffa02f3000
ext4 386181 2 - Live 0xffffffffa0278000
mbcache 6317 1 ext4, Live 0xffffffffa0272000
jbd2 70425 1 ext4, Live 0xffffffffa0256000
crc16 1643 1 ext4, Live 0xffffffffa0252000
sr_mod 13275 0 - Live 0xffffffffa0246000
sd_mod 30692 4 - Live 0xffffffffa0239000
cdrom 33723 1 sr_mod, Live 0xffffffffa022b000
crc_t10dif 1499 1 sd_mod, Live 0xffffffffa0227000
uhci_hcd 18980 0 - Live 0xffffffffa021e000
ahci 19800 3 - Live 0xffffffffa0214000
libahci 20328 1 ahci, Live 0xffffffffa020a000
libata 169193 2 ahci,libahci, Live 0xffffffffa01ca000
scsi_mod 190814 3 sr_mod,sd_mod,libata, Live 0xffffffffa0142000
ehci_hcd 33755 0 - Live 0xffffffffa01bc000
thermal 8342 0 - Live 0xffffffffa0199000
thermal_sys 14742 3 video,processor,thermal, Live 0xffffffffa0191000
atl1c 27404 0 - Live 0xffffffffa0185000
usbcore 146444 4 uvcvideo,uhci_hcd,ehci_hcd, Live 0xffffffffa0039000
usb_common 1117 1 usbcore, Live 0xffffffffa0000000

# cat /proc/ioports

0000-0cf7 : PCI Bus 0000:00
0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-0060 : keyboard
0062-0062 : EC data
0064-0064 : keyboard
0066-0066 : EC cmd
0070-0077 : rtc0
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
03c0-03df : vga+
0400-047f : pnp 00:01
0400-0403 : ACPI PM1a_EVT_BLK
0404-0405 : ACPI PM1a_CNT_BLK
0408-040b : ACPI PM_TMR
0410-0415 : ACPI CPU throttle
0420-042f : ACPI GPE0_BLK
0430-0433 : iTCO_wdt
0450-0450 : ACPI PM2_CNT_BLK
0460-047f : iTCO_wdt
0500-057f : pnp 00:01
0600-060f : pnp 00:01
0610-0610 : pnp 00:01
0800-080f : pnp 00:01
0810-0817 : pnp 00:01
0820-0823 : pnp 00:01
0cf8-0cff : PCI conf1
0d00-ffff : PCI Bus 0000:00
1000-2fff : PCI Bus 0000:05
1000-107f : 0000:05:00.0
1000-107f : atl1c
3000-3fff : PCI Bus 0000:04
4000-4fff : PCI Bus 0000:02
5000-501f : 0000:00:1f.3
5000-501f : i801_smbus
5020-503f : 0000:00:1f.2
5020-503f : ahci
5040-505f : 0000:00:1d.2
5040-505f : uhci_hcd
5060-507f : 0000:00:1d.1
5060-507f : uhci_hcd
5080-509f : 0000:00:1d.0
5080-509f : uhci_hcd
50a0-50bf : 0000:00:1a.0
50a0-50bf : uhci_hcd
50c0-50c7 : 0000:00:1f.2
50c0-50c7 : ahci
50c8-50cf : 0000:00:1f.2
50c8-50cf : ahci
50d0-50d7 : 0000:00:02.0
50d8-50db : 0000:00:1f.2
50d8-50db : ahci
50dc-50df : 0000:00:1f.2
50dc-50df : ahci
ff2c-ff2f : pnp 00:01

I am new to all this kernel dev/mailing list stuff so I apologize in
advance if I have done anything wrong by sending this.
Thanks for the help,
Chris.


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