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Bought a new laptop (Toshiba Portege R835-P70) and installed xubuntu
11.04. Everything works fine and is up to date (including screen
brightness controls) except when it wakes from standby. At that time,
the brightness controls cease to function. Syslog and kern.log both
report the same error. I've tried to "cat "brightness:4" >
/proc/acpi/toshiba/lcd", as su, but it refuses to lower or raise the
brightness. Video adapter is an Intel generic.  Again, it works
perfectly fine after a fresh boot, but on waking from standby, the
screen brightness cannot be changed. I suspect that resuming from
standby also causes other malfunctions, but I haven't been able to
confirm it yet.

Based on other, similar, problems regarding the newer Toshiba laptops,
it seems that something in the ACPI or toshiba_acpi is buggy. Unloading
and reloading the toshiba_acpi module does not return functionality. I
can provide more information if needed.

Steps to reproduce:
1. Put laptop into standby, then wake.
2. Attempt to change brightness settings.

log of attempting to change brighness after wake:

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456526] ACPI Error: [GTF0]
Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456531] ACPI Error: Method
parse/execution failed [\_SB_.PCI0.SAT0.PRT0._SDD] (Node
ffff880147646cd0), AE_NOT_FOUND (20110112/psparse-536)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456550] ACPI Error: [GTF0]
Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.456554] ACPI Error: Method
parse/execution failed [\_SB_.PCI0.SAT0.PRT0._GTF] (Node
ffff880147646cf8), AE_NOT_FOUND (20110112/psparse-536)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458177] ACPI Error: [GTF0]
Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458181] ACPI Error: Method
parse/execution failed [\_SB_.PCI0.SAT0.PRT0._SDD] (Node
ffff880147646cd0), AE_NOT_FOUND (20110112/psparse-536)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458193] ACPI Error: [GTF0]
Namespace lookup failure, AE_NOT_FOUND (20110112/psargs-359)

Sep 18 15:11:15 PORTEGE-R835 kernel: [  102.458196] ACPI Error: Method
parse/execution failed [\_SB_.PCI0.SAT0.PRT0._GTF] (Node
ffff880147646cf8), AE_NOT_FOUND (20110112/psparse-536)

Sep 18 15:11:23 PORTEGE-R835 kernel: [  110.661102] ACPI: Failed to switch the brightness
Sep 18 15:11:23 PORTEGE-R835 kernel: [  110.917468] ACPI: Failed to switch the brightness
Sep 18 15:11:24 PORTEGE-R835 kernel: [  111.196951] ACPI: Failed to switch the brightness

lsb_release: (pastebin version: http://pastebin.com/eiTtwhYY)
PORTEGE-R835:~$ lsb_release -a; lsmod
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.04
Release: 11.04
Codename: natty
Module Size Used by
sha256_generic 21031 2
cryptd 20510 0
aes_x86_64 17208 160
aes_generic 38279 1 aes_x86_64
binfmt_misc 17565 1
parport_pc 36959 0
ppdev 17113 0
dm_crypt 22993 1
vboxnetadp 13340 0
vboxnetflt 28297 0
vboxdrv 252684 2 vboxnetadp,vboxnetflt
snd_hda_codec_hdmi 28167 1
snd_hda_codec_realtek 336771 1
joydev 17606 0
snd_hda_intel 33176 3
arc4 12529 2
snd_hda_codec 103804 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep 13604 1 snd_hda_codec
snd_pcm 96391 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
uvcvideo 72195 0
snd_seq_midi 13324 0
videodev 82052 1 uvcvideo
snd_rawmidi 30486 1 snd_seq_midi
snd_seq_midi_event 14899 1 snd_seq_midi
v4l2_compat_ioctl32 17078 1 videodev
snd_seq 61621 2 snd_seq_midi,snd_seq_midi_event
iwlagn 333716 0
snd_timer 29602 2 snd_pcm,snd_seq
snd_seq_device 14462 3 snd_seq_midi,snd_rawmidi,snd_seq
snd 67382 16 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
iwlcore 167502 1 iwlagn
mac80211 294370 2 iwlagn,iwlcore
psmouse 73535 0
serio_raw 13166 0
cfg80211 178528 3 iwlagn,iwlcore,mac80211
soundcore 12680 1 snd
snd_page_alloc 18529 2 snd_hda_intel,snd_pcm
toshiba_acpi 14180 0
sparse_keymap 13898 1 toshiba_acpi
lp 17825 0
parport 46458 3 parport_pc,ppdev,lp
i915 515121 2
e1000e 159096 0
ahci 25951 2
drm_kms_helper 42136 1 i915
libahci 26642 1 ahci
drm 227534 3 i915,drm_kms_helper
sdhci_pci 13989 0
xhci_hcd 77643 0
sdhci 27387 1 sdhci_pci
i2c_algo_bit 13400 1 i915
video 19438 1 i915

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
ACPI: Toshiba screen brightness fails to function after waking from standby
https://bugs.launchpad.net/bugs/857678
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