Probleme d'eclairage de l'écran et du son

bonjour
j’ai installé debian 6.0.3 à partir du cd live gnome du taille 1.1go
j’ai fait tous le mise à jours nécessaire ( apt-get upgrade)
le probleme c’est que l’ecran trés brillante (eclairage 100%), apparament le driver n’est pas detecter. que dois je faire ?

voici quelques informations :
la commande lshw -html donne pastehtml.com/view/cmmg1ouv9.html

root@debian:/home/user# lspci -kk 00:00.0 Host bridge: Intel Corporation Sandy Bridge DRAM Controller (rev 09) Subsystem: Toshiba America Info Systems Device fc50 00:02.0 VGA compatible controller: Intel Corporation Sandy Bridge Integrated Graphics Controller (rev 09) Subsystem: Toshiba America Info Systems Device fc50 00:16.0 Communication controller: Intel Corporation Cougar Point HECI Controller #1 (rev 04) Subsystem: Toshiba America Info Systems Device fc50 00:1a.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #2 (rev 04) Subsystem: Toshiba America Info Systems Device fc50 Kernel driver in use: ehci_hcd 00:1b.0 Audio device: Intel Corporation Cougar Point High Definition Audio Controller (rev 04) Subsystem: Toshiba America Info Systems Device fc50 Kernel driver in use: HDA Intel 00:1c.0 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 1 (rev b4) Kernel driver in use: pcieport 00:1c.5 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 6 (rev b4) Kernel driver in use: pcieport 00:1c.6 PCI bridge: Intel Corporation Cougar Point PCI Express Root Port 7 (rev b4) Kernel driver in use: pcieport 00:1d.0 USB Controller: Intel Corporation Cougar Point USB Enhanced Host Controller #1 (rev 04) Subsystem: Toshiba America Info Systems Device fc50 Kernel driver in use: ehci_hcd 00:1f.0 ISA bridge: Intel Corporation Cougar Point LPC Controller (rev 04) Subsystem: Toshiba America Info Systems Device fc50 00:1f.2 SATA controller: Intel Corporation Cougar Point 6 port SATA AHCI Controller (rev 04) Subsystem: Toshiba America Info Systems Device fc50 Kernel driver in use: ahci 00:1f.3 SMBus: Intel Corporation Cougar Point SMBus Controller (rev 04) Subsystem: Toshiba America Info Systems Device fc50 02:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01) Subsystem: Askey Computer Corp. Device 7173 Kernel driver in use: ath9k 03:00.0 Ethernet controller: Atheros Communications AR8152 v2.0 Fast Ethernet (rev c1) Subsystem: Toshiba America Info Systems Device fc50 Kernel driver in use: atl1c

root@debian:/home/user# lsmod Module Size Used by i915 257366 0 drm_kms_helper 20369 1 i915 drm 143072 2 i915,drm_kms_helper i2c_algo_bit 4209 1 i915 parport_pc 18855 0 ppdev 5030 0 lp 7462 0 parport 27954 3 parport_pc,ppdev,lp sco 7225 2 bridge 39646 0 stp 1440 1 bridge bnep 9427 2 rfcomm 29629 0 l2cap 24752 6 bnep,rfcomm crc16 1319 1 l2cap acpi_cpufreq 5571 1 cpufreq_stats 2740 0 cpufreq_powersave 902 0 cpufreq_conservative 5162 0 cpufreq_userspace 1992 0 binfmt_misc 6431 1 uinput 6376 1 fuse 50924 1 loop 11799 0 arc4 1274 2 snd_hda_intel 20035 1 ecb 1841 2 snd_hda_codec 54292 1 snd_hda_intel snd_hwdep 5380 1 snd_hda_codec ath9k 249976 0 snd_pcm 60487 2 snd_hda_intel,snd_hda_codec mac80211 137372 1 ath9k ath 8006 1 ath9k snd_seq 42881 0 joydev 8459 0 btusb 9913 0 uvcvideo 52127 0 cfg80211 101496 3 ath9k,mac80211,ath videodev 30089 1 uvcvideo v4l1_compat 11442 2 uvcvideo,videodev snd_timer 15598 2 snd_pcm,snd_seq snd_seq_device 4493 1 snd_seq v4l2_compat_ioctl32 8474 1 videodev led_class 2433 1 ath9k bluetooth 41827 7 sco,bnep,rfcomm,l2cap,btusb snd 46526 9 snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_seq,snd_timer,snd_seq_device video 17445 1 i915 soundcore 4598 1 snd rfkill 13044 4 cfg80211,bluetooth output 1692 1 video evdev 7352 13 snd_page_alloc 6249 2 snd_hda_intel,snd_pcm i2c_i801 7830 0 i2c_core 15819 6 i915,drm_kms_helper,drm,i2c_algo_bit,videodev,i2c_i801 psmouse 49985 0 wmi 4323 0 serio_raw 3752 0 pcspkr 1699 0 processor 29935 5 acpi_cpufreq button 4650 1 i915 battery 4998 0 ac 2192 0 ext3 106710 1 jbd 37317 1 ext3 mbcache 5050 1 ext3 sg 24069 0 usb_storage 40217 0 sr_mod 12602 0 sd_mod 29937 2 crc_t10dif 1276 1 sd_mod cdrom 29351 1 sr_mod ahci 32934 1 thermal 11674 0 ehci_hcd 32097 0 libata 133776 1 ahci atl1c 27315 0 scsi_mod 126725 5 sg,usb_storage,sr_mod,sd_mod,libata thermal_sys 11942 3 video,processor,thermal usbcore 123271 5 btusb,uvcvideo,usb_storage,ehci_hcd nls_base 6377 1 usbcore

j’ai un autre probleme aussi
lorsque je veux entendre de la music en utilisant le casque , les baffes de mon PC restent marcher comment faire pour les arretes ?

merci d’avence