I recently installed CentOS 7 with GNOME in a dual-boot setup with Windows 10 on my new Lenovo Thinkpad T14 with integrated Intel graphics. The control of the screen brightness does not work under CentOS and the screen is always at maximum brightness (brightness control does work under Windows though).
Some things I've already tried:
Originally the directory under /sys/class/backlight was empty, but I followed the steps outlined in https://unix.stackexchange.com/question ... s-centos-7 in order to change the boot parameters, in particular I added the
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thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor
I installed xbacklight, but using the
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xbacklight -set 50
When using the command
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xrandr --output default --brightness 0.4
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xrandr: Gamma size is 0.
Further info that might be relevant:
Here's the basic output of the getinfo script from the README post in this forum:
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== BEGIN uname -rmi ==
3.10.0-1160.el7.x86_64 x86_64 x86_64
== END uname -rmi ==
== BEGIN rpm -qa \*-release\* ==
epel-release-7-11.noarch
centos-release-7-9.2009.0.el7.centos.x86_64
rpmfusion-free-release-7-4.noarch
== END rpm -qa \*-release\* ==
== BEGIN cat /etc/redhat-release ==
CentOS Linux release 7.9.2009 (Core)
== END cat /etc/redhat-release ==
== BEGIN getenforce ==
Enforcing
== END getenforce ==
== BEGIN free -m ==
total used free shared buff/cache available
Mem: 7480 1915 4076 386 1487 4927
Swap: 7679 0 7679
== END free -m ==
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00:00.0 Host bridge [0600]: Intel Corporation Device [8086:9b61] (rev 0c)
00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics [8086:9b41] (rev 02)
00:04.0 Signal processing controller [1180]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem [8086:1903] (rev 0c)
00:08.0 System peripheral [0880]: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model [8086:1911]
00:12.0 Signal processing controller [1180]: Intel Corporation Comet Lake Thermal Subsytem [8086:02f9]
00:14.0 USB controller [0c03]: Intel Corporation Device [8086:02ed]
00:14.2 RAM memory [0500]: Intel Corporation Device [8086:02ef]
00:14.3 Network controller [0280]: Intel Corporation Wireless-AC 9462 [8086:02f0]
00:16.0 Communication controller [0780]: Intel Corporation Comet Lake Management Engine Interface [8086:02e0]
00:1c.0 PCI bridge [0604]: Intel Corporation Device [8086:02b8] (rev f0)
00:1c.4 PCI bridge [0604]: Intel Corporation Device [8086:02bc] (rev f0)
00:1d.0 PCI bridge [0604]: Intel Corporation Device [8086:02b0] (rev f0)
00:1d.4 PCI bridge [0604]: Intel Corporation Device [8086:02b4] (rev f0)
00:1f.0 ISA bridge [0601]: Intel Corporation Device [8086:0284]
00:1f.3 Audio device [0403]: Intel Corporation Device [8086:02c8]
00:1f.4 SMBus [0c05]: Intel Corporation Device [8086:02a3]
00:1f.5 Serial bus controller [0c80]: Intel Corporation Comet Lake SPI (flash) Controller [8086:02a4]
00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection (10) I219-V [8086:0d4f]
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI Express Card Reader [10ec:522a] (rev 01)
03:00.0 PCI bridge [0604]: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] [8086:15c0] (rev 01)
04:00.0 PCI bridge [0604]: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] [8086:15c0] (rev 01)
04:01.0 PCI bridge [0604]: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] [8086:15c0] (rev 01)
04:02.0 PCI bridge [0604]: Intel Corporation JHL6240 Thunderbolt 3 Bridge (Low Power) [Alpine Ridge LP 2016] [8086:15c0] (rev 01)
05:00.0 System peripheral [0880]: Intel Corporation JHL6240 Thunderbolt 3 NHI (Low Power) [Alpine Ridge LP 2016] [8086:15bf] (rev 01)
2b:00.0 USB controller [0c03]: Intel Corporation JHL6240 Thunderbolt 3 USB 3.1 Controller (Low Power) [Alpine Ridge LP 2016] [8086:15c1] (rev 01)
2e:00.0 Non-Volatile memory controller [0108]: Toshiba Corporation Device [1179:011a]
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[ 4.141138] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[ 4.141141] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 4.141142] thinkpad_acpi: ThinkPad BIOS N2XET23W (1.13 ), EC unknown
[ 4.141143] thinkpad_acpi: Lenovo ThinkPad T14 Gen 1, model 20S00029AU
[ 4.141581] thinkpad_acpi: detected a 8-level brightness capable ThinkPad
[ 4.141627] thinkpad_acpi: radio switch found; radios are enabled
[ 4.143456] thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
[ 4.148152] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input9
[ 26.786697] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 26.786703] thinkpad_acpi: unhandled HKEY event 0x6032
[ 26.786705] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 134.453079] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 134.453091] thinkpad_acpi: unhandled HKEY event 0x6032
[ 134.453096] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 155.759848] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 155.759858] thinkpad_acpi: unhandled HKEY event 0x6032
[ 155.759863] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 175.590011] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 175.590018] thinkpad_acpi: unhandled HKEY event 0x6032
[ 175.590021] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 218.347273] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 218.347279] thinkpad_acpi: unhandled HKEY event 0x6032
[ 218.347282] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 288.493332] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 288.493337] thinkpad_acpi: unhandled HKEY event 0x6032
[ 288.493339] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 294.848520] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 294.848524] thinkpad_acpi: unhandled HKEY event 0x6032
[ 294.848525] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 370.369449] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 370.369453] thinkpad_acpi: unhandled HKEY event 0x6032
[ 370.369455] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 418.840234] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 418.840238] thinkpad_acpi: unhandled HKEY event 0x6032
[ 418.840240] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 437.801774] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 437.801778] thinkpad_acpi: unhandled HKEY event 0x6032
[ 437.801780] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 448.077467] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 448.077477] thinkpad_acpi: unhandled HKEY event 0x6032
[ 448.077482] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 454.478777] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 454.478787] thinkpad_acpi: unhandled HKEY event 0x6032
[ 454.478792] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 468.932399] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 468.932402] thinkpad_acpi: unhandled HKEY event 0x6032
[ 468.932404] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 483.563079] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 483.563089] thinkpad_acpi: unhandled HKEY event 0x6032
[ 483.563094] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 508.905406] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 508.905416] thinkpad_acpi: unhandled HKEY event 0x6032
[ 508.905421] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 520.603819] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 520.603829] thinkpad_acpi: unhandled HKEY event 0x6032
[ 520.603834] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 542.605701] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 542.605707] thinkpad_acpi: unhandled HKEY event 0x6032
[ 542.605709] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 643.297491] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 643.297501] thinkpad_acpi: unhandled HKEY event 0x6032
[ 643.297506] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 697.429294] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 697.429299] thinkpad_acpi: unhandled HKEY event 0x6032
[ 697.429300] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 864.965207] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 864.965217] thinkpad_acpi: unhandled HKEY event 0x6032
[ 864.965221] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 960.868976] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 960.868986] thinkpad_acpi: unhandled HKEY event 0x6032
[ 960.868990] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 971.334156] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 971.334161] thinkpad_acpi: unhandled HKEY event 0x6032
[ 971.334163] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1022.900209] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1022.900212] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1022.900214] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1066.637790] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1066.637800] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1066.637805] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1163.846071] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1163.846081] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1163.846086] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1189.053760] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1189.053764] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1189.053765] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1336.234124] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1336.234137] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1336.234142] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1455.684042] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1455.684046] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1455.684049] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1462.709384] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1462.709393] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1462.709398] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
[ 1494.847830] thinkpad_acpi: unknown possible thermal alarm or keyboard event received
[ 1494.847833] thinkpad_acpi: unhandled HKEY event 0x6032
[ 1494.847834] thinkpad_acpi: please report the conditions when this event happened to ibm-acpi-devel@lists.sourceforge.net
Thanks in advance!