Screen brightness on X220 with Fn keys does not work below some threshold
I have a Thinkpad X220 and am running Debian 9 stable with kernel
Linux version 4.9.0-8-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.135-1 (2018-11-11)
using XFCE 4.12, and have encountered a rather strange bug.
Basically, if I initially start from the max brightness setting, and want to reduce it to near 0 (5 seems to be the dimmest setting using the power manager scrollbar), if I use the Fn key, it is unable to go below the value 383 (as reported by cat /sys/class/backlight/intel_backlight/brightness) unless I manually use the scrollbar in the power manager. The actual value (383) does seem to actually depend on which brightness value I start with, and I can always reach the max level using the other Fn key, but the minimum level just gets stuck on a very high value, making it annoying to adjust in low-light settings. Is there a way to fix this behaviour so I can properly reduce the brightness below this (seemingly arbitrary) threshold using the Fn key?
debian xfce thinkpad brightness
asked 18 mins ago
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I have a Thinkpad X220 and am running Debian 9 stable with kernel
Linux version 4.9.0-8-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.135-1 (2018-11-11)
using XFCE 4.12, and have encountered a rather strange bug.
Basically, if I initially start from the max brightness setting, and want to reduce it to near 0 (5 seems to be the dimmest setting using the power manager scrollbar), if I use the Fn key, it is unable to go below the value 383 (as reported by cat /sys/class/backlight/intel_backlight/brightness) unless I manually use the scrollbar in the power manager. The actual value (383) does seem to actually depend on which brightness value I start with, and I can always reach the max level using the other Fn key, but the minimum level just gets stuck on a very high value, making it annoying to adjust in low-light settings. Is there a way to fix this behaviour so I can properly reduce the brightness below this (seemingly arbitrary) threshold using the Fn key?
debian xfce thinkpad brightness
asked 18 mins ago
GreaterThanZero
1
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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I have a Thinkpad X220 and am running Debian 9 stable with kernel
Linux version 4.9.0-8-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.135-1 (2018-11-11)
using XFCE 4.12, and have encountered a rather strange bug.
Basically, if I initially start from the max brightness setting, and want to reduce it to near 0 (5 seems to be the dimmest setting using the power manager scrollbar), if I use the Fn key, it is unable to go below the value 383 (as reported by cat /sys/class/backlight/intel_backlight/brightness) unless I manually use the scrollbar in the power manager. The actual value (383) does seem to actually depend on which brightness value I start with, and I can always reach the max level using the other Fn key, but the minimum level just gets stuck on a very high value, making it annoying to adjust in low-light settings. Is there a way to fix this behaviour so I can properly reduce the brightness below this (seemingly arbitrary) threshold using the Fn key?
debian xfce thinkpad brightness
asked 18 mins ago
GreaterThanZero
1
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a Thinkpad X220 and am running Debian 9 stable with kernel
Linux version 4.9.0-8-amd64 (debian-kernel@lists.debian.org) (gcc version 6.3.0 20170516 (Debian 6.3.0-18+deb9u1) ) #1 SMP Debian 4.9.135-1 (2018-11-11)
using XFCE 4.12, and have encountered a rather strange bug.
Basically, if I initially start from the max brightness setting, and want to reduce it to near 0 (5 seems to be the dimmest setting using the power manager scrollbar), if I use the Fn key, it is unable to go below the value 383 (as reported by cat /sys/class/backlight/intel_backlight/brightness) unless I manually use the scrollbar in the power manager. The actual value (383) does seem to actually depend on which brightness value I start with, and I can always reach the max level using the other Fn key, but the minimum level just gets stuck on a very high value, making it annoying to adjust in low-light settings. Is there a way to fix this behaviour so I can properly reduce the brightness below this (seemingly arbitrary) threshold using the Fn key?
debian xfce thinkpad brightness
debian xfce thinkpad brightness
asked 18 mins ago
GreaterThanZero
1
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 18 mins ago
GreaterThanZero
1
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 18 mins ago
GreaterThanZero
1
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 18 mins ago
GreaterThanZero
1
asked 18 mins ago
GreaterThanZero
1
1
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
GreaterThanZero is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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