ACPI notify (special buttons for screen brigtness etc) stop working after laptop resumes from mem-sleep.
Previous kernel 2.6.34 was ok.

Description:

BUG: unable to handle kernel NULL pointer dereference at 0000001a
IP: [<c11d12e0>] acpi_ev_notify_dispatch+0x44/0x63
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq
Modules linked in: serial_cs cpufreq_ondemand isofs sr_mod cdrom usb_storage nls_utf8 tun fuse ipv6 xt_tcpudp ipt_LOG xt_multiport xt_owner iptable_filter ip_tables x_tables cifs acpi_cpufreq freq_table ext3 jbd snd_hda_codec_intelhdmi snd_hda_codec_analog tpm_infineon snd_seq_dummy snd_seq_oss snd_seq_midi_event mmc_block snd_seq snd_seq_device arc4 snd_hda_intel snd_pcm_oss ecb pcmcia snd_hda_codec snd_hwdep snd_pcm snd_mixer_oss iwlagn sdhci_pci i915 snd_timer sdhci iwlcore tpm_tis drm_kms_helper yenta_socket snd joydev rsrc_nonstatic mmc_core drm soundcore tpm mac80211 panasonic_laptop pcmcia_core led_class tpm_bios i2c_algo_bit usbhid snd_page_alloc intel_agp cfg80211 iTCO_wdt battery ac i2c_i801 e1000e hid iTCO_vendor_support video agpgart rfkill psmouse button thermal processor i2c_core output sg pcspkr serio_raw evdev rtc_cmos rtc_core rtc_lib ext4 mbcache jbd2 crc16 sha256_generic aes_i586 aes_generic cbc dm_crypt dm_mod sd_mod ahci uhci_hcd libata scsi_mod ehci_hcd usbcore

Pid: 21, comm: kacpi_notify Not tainted 2.6.34-ARCH #1
EIP: 0060:[<c11d12e0>] EFLAGS: 00010202 CPU: 0
EIP is at acpi_ev_notify_dispatch+0x44/0x63
EAX: f312f2d0 EBX: f312f2d0 ECX: d6cfaf0c EDX: c3000080
ESI: 00000002 EDI: c11c3644 EBP: f70adf54 ESP: f70adf4c
DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process kacpi_notify (pid: 21, ti=f70ac000 task=f7055d30 task.ti=f70ac000)
Stack:
d6cfa940 d6cfa948 f70adf64 c11c3661 c3008c80 d6cfa948 f70adfbc c105abfd
<0> c12d888a 00000001 f70adf7c c1470080 c1470080 f7055f70 00000000 f7055d30
<0> f7055d30 c3008c8c f7055d30 c3008c84 00000000 f7055d30 c105ef10 f70adfa8
Call Trace:
[<c11c3661>] ? acpi_os_execute_deferred+0x1d/0x28
[<c105abfd>] ? worker_thread+0x10d/0x240
[<c12d888a>] ? schedule+0x29a/0x720
[<c105ef10>] ? autoremove_wake_function+0x0/0x40
[<c105aaf0>] ? worker_thread+0x0/0x240
[<c105eb1c>] ? kthread+0x6c/0x80
[<c105eab0>] ? kthread+0x0/0x80
[<c1003d3e>] ? kernel_thread_helper+0x6/0x18
Code: 74 20 8b 0d 90 38 55 c1 eb 10 8b 35 6c 38 55 c1 85 f6 74 0e 8b 0d 70 38 55 c1 8b 43 0c 0f b7 d2 ff d6 8b 73 10 85 f6 75 12 eb 14 <8b> 4e 18 0f b7 53 06 8b 43 0c ff 56 14 8b 76 1c 85 f6 75 ec 89
EIP: [<c11d12e0>] acpi_ev_notify_dispatch+0x44/0x63 SS:ESP 0068:f70adf4c
CR2: 000000000000001a
---[ end trace 8d49fa33aefcdc6c ]---