通常我在家里用笔记本电脑听音乐，同时用电脑做事。正如所料，经过一段时间的不活动后，屏幕保护程序会在我的 debian（stretch）系统上启动。
要更改音乐音量，我必须重新输入用户密码才能登录，因为在登录屏幕上音量热键已失效，而屏幕亮度热键仍然有效。这种行为在聚会上可能非常有效，可以防止客人操纵音量 - 但每次我接到电话时，我都必须重新输入整个密码才能获得静音/取消静音音乐的权限。
我花了一些时间在互联网上弄清楚如何向音量热键添加权限，以便在登录屏幕上工作，例如屏幕亮度热键。我还没有找到任何提示。
编辑：它是 Thinkpad T400 上的“普通”Debian Stretch 安装，除了使用 Gnome Classic 模式作为用户界面。
[output of uname -a]
Linux debian 4.9.0-6-amd64 #1 SMP Debian 4.9.88-1+deb9u1 (2018-05-07) x86_64 GNU/Linux
[excerpt of hwinfo]
description: Notebook
product: 6474D88
vendor: LENOVO
version: ThinkPad T400
serial:
width: 64 bits
capabilities: smbios-2.4 dmi-2.4 smp vsyscall32
configuration: administrator_password=disabled boot=normal chassis=notebook family=ThinkPad T400 frontpanel_password=unknown keyboard_password=disabled power-on_password=disabled
*-multimedia
description: Audio device
product: 82801I (ICH9 Family) HD Audio Controller
vendor: Intel Corporation
physical id: 1b
bus info: pci@0000:00:1b.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:33 memory:fc120000-fc123fff
[output of modinfo]
Module Size Used by
option 53248 0
uas 24576 0
usb_wwan 20480 1 option
qmi_wwan 28672 0
usbserial 49152 2 option,usb_wwan
usb_storage 73728 1 uas
cdc_wdm 20480 1 qmi_wwan
usbnet 45056 1 qmi_wwan
mii 16384 1 usbnet
fuse 98304 3
ctr 16384 2
ccm 20480 1
rfcomm 77824 2
bnep 20480 2
binfmt_misc 20480 1
uvcvideo 90112 0
videobuf2_vmalloc 16384 1 uvcvideo
videobuf2_memops 16384 1 videobuf2_vmalloc
videobuf2_v4l2 24576 1 uvcvideo
videobuf2_core 40960 2 uvcvideo,videobuf2_v4l2
videodev 176128 3 uvcvideo,videobuf2_core,videobuf2_v4l2
media 40960 2 uvcvideo,videodev
coretemp 16384 0
arc4 16384 2
iwldvm 139264 0
mac80211 671744 1 iwldvm
iTCO_wdt 16384 0
kvm 593920 0
iTCO_vendor_support 16384 1 iTCO_wdt
pcmcia 65536 0
irqbypass 16384 1 kvm
r852 20480 0
sm_common 16384 1 r852
nand 61440 2 r852,sm_common
nand_ecc 16384 1 nand
nand_bch 16384 1 nand
pcspkr 16384 0
bch 24576 1 nand_bch
r592 20480 0
evdev 24576 14
nand_ids 16384 1 nand
memstick 20480 1 r592
joydev 20480 0
mtd 65536 3 nand_bch,sm_common,nand
btusb 45056 0
iwlwifi 151552 1 iwldvm
yenta_socket 49152 0
i915 1257472 12
pcmcia_rsrc 20480 1 yenta_socket
pcmcia_core 24576 3 yenta_socket,pcmcia,pcmcia_rsrc
btrtl 16384 1 btusb
btbcm 16384 1 btusb
btintel 16384 1 btusb
cfg80211 589824 3 iwlwifi,mac80211,iwldvm
bluetooth 552960 31 btrtl,btintel,bnep,btbcm,rfcomm,btusb
snd_hda_codec_conexant 24576 1
snd_hda_codec_generic 69632 1 snd_hda_codec_conexant
sg 32768 0
lpc_ich 24576 0
mfd_core 16384 1 lpc_ich
serio_raw 16384 0
drm_kms_helper 155648 1 i915
snd_hda_intel 36864 8
drm 360448 10 i915,drm_kms_helper
snd_hda_codec 135168 3 snd_hda_intel,snd_hda_codec_conexant,snd_hda_codec_generic
shpchp 36864 0
i2c_algo_bit 16384 1 i915
snd_hda_core 86016 4 snd_hda_intel,snd_hda_codec_conexant,snd_hda_codec,snd_hda_codec_generic
mei_me 36864 0
mei 102400 1 mei_me
snd_hwdep 16384 1 snd_hda_codec
snd_pcm 110592 4 snd_hda_intel,snd_hda_codec,snd_hda_core
snd_timer 32768 1 snd_pcm
thinkpad_acpi 86016 0
nvram 16384 1 thinkpad_acpi
snd 86016 23 snd_hda_intel,snd_hwdep,snd_hda_codec_conexant,snd_hda_codec,snd_timer,thinkpad_acpi,snd_hda_codec_generic,snd_pcm
soundcore 16384 1 snd
rfkill 24576 7 bluetooth,thinkpad_acpi,cfg80211
wmi 16384 0
ac 16384 0
battery 20480 0
button 16384 1 i915
video 40960 2 thinkpad_acpi,i915
acpi_cpufreq 20480 1
parport_pc 28672 1
ppdev 20480 0
lp 20480 0
parport 49152 3 lp,parport_pc,ppdev
ip_tables 24576 0
x_tables 36864 1 ip_tables
autofs4 40960 2
ext4 585728 2
crc16 16384 2 bluetooth,ext4
jbd2 106496 1 ext4
crc32c_generic 16384 2
fscrypto 28672 1 ext4
ecb 16384 0
lrw 16384 0
glue_helper 16384 0
ablk_helper 16384 0
cryptd 24576 1 ablk_helper
aes_x86_64 20480 3
mbcache 16384 3 ext4
xts 16384 3
gf128mul 16384 2 lrw,xts
algif_skcipher 20480 0
af_alg 16384 1 algif_skcipher
dm_crypt 28672 1
dm_mod 118784 9 dm_crypt
sd_mod 49152 3
psmouse 135168 0
ahci 36864 2
libahci 32768 1 ahci
i2c_i801 24576 0
libata 249856 2 ahci,libahci
i2c_smbus 16384 1 i2c_i801
scsi_mod 225280 5 sd_mod,usb_storage,libata,uas,sg
firewire_ohci 40960 0
sdhci_pci 28672 0
sdhci 45056 1 sdhci_pci
mmc_core 147456 2 sdhci,sdhci_pci
firewire_core 65536 1 firewire_ohci
crc_itu_t 16384 1 firewire_core
xhci_pci 16384 0
xhci_hcd 188416 1 xhci_pci
ehci_pci 16384 0
thermal 20480 0
uhci_hcd 45056 0
ehci_hcd 81920 1 ehci_pci
e1000e 249856 0
usbcore 253952 15 usbnet,uvcvideo,usb_storage,ehci_hcd,qmi_wwan,uhci_hcd,cdc_wdm,usbserial,xhci_pci,btusb,option,uas,usb_wwan,xhci_hcd,ehci_pci
ptp 20480 1 e1000e
pps_core 16384 1 ptp
usb_common 16384 1 usbcore