Backlight control configuration misbehaves on an Ideapad.
I did a clean Ubuntu install on a Lenovo Ideapad P500.
The backlight started okay, but after pressing the keyboard light function once, it got reset to a very dark state. The brightness setting wasn't adjustable then, even after restarting the system.
I found a partial fix that involved changing a setting in /etc/default/grub; specifically, I added acpi_osi=Linux acpi_backlight=vendor in the variable GRUB_CMDLINE_LINUX_DEFAULT.
But this is only a partial fix because it selects a zero-brightness level at startup, and it also turns the brightness off when selecting the max level. This is an annoyance.
I discovered that this behavior is independent of Ubuntu, since something similar happened when I installed OpenSUSE in dual boot; and I also found similar posts that were related to different Lenovo laptops. My question is if this has to do with the Linux kernel, and/or if I have to update the drivers? If so, how can I fix this?
Let me know if I can provide more details to fix this. Thanks for helping out.
linux-kernel grub backlight
asked Oct 18 '15 at 20:06
DiegoDiego
1113
add a comment |
I did a clean Ubuntu install on a Lenovo Ideapad P500.
The backlight started okay, but after pressing the keyboard light function once, it got reset to a very dark state. The brightness setting wasn't adjustable then, even after restarting the system.
I found a partial fix that involved changing a setting in /etc/default/grub; specifically, I added acpi_osi=Linux acpi_backlight=vendor in the variable GRUB_CMDLINE_LINUX_DEFAULT.
But this is only a partial fix because it selects a zero-brightness level at startup, and it also turns the brightness off when selecting the max level. This is an annoyance.
I discovered that this behavior is independent of Ubuntu, since something similar happened when I installed OpenSUSE in dual boot; and I also found similar posts that were related to different Lenovo laptops. My question is if this has to do with the Linux kernel, and/or if I have to update the drivers? If so, how can I fix this?
Let me know if I can provide more details to fix this. Thanks for helping out.
linux-kernel grub backlight
asked Oct 18 '15 at 20:06
DiegoDiego
1113
add a comment |
I did a clean Ubuntu install on a Lenovo Ideapad P500.
The backlight started okay, but after pressing the keyboard light function once, it got reset to a very dark state. The brightness setting wasn't adjustable then, even after restarting the system.
I found a partial fix that involved changing a setting in /etc/default/grub; specifically, I added acpi_osi=Linux acpi_backlight=vendor in the variable GRUB_CMDLINE_LINUX_DEFAULT.
But this is only a partial fix because it selects a zero-brightness level at startup, and it also turns the brightness off when selecting the max level. This is an annoyance.
I discovered that this behavior is independent of Ubuntu, since something similar happened when I installed OpenSUSE in dual boot; and I also found similar posts that were related to different Lenovo laptops. My question is if this has to do with the Linux kernel, and/or if I have to update the drivers? If so, how can I fix this?
Let me know if I can provide more details to fix this. Thanks for helping out.
linux-kernel grub backlight
asked Oct 18 '15 at 20:06
DiegoDiego
1113
I did a clean Ubuntu install on a Lenovo Ideapad P500.
The backlight started okay, but after pressing the keyboard light function once, it got reset to a very dark state. The brightness setting wasn't adjustable then, even after restarting the system.
I found a partial fix that involved changing a setting in /etc/default/grub; specifically, I added acpi_osi=Linux acpi_backlight=vendor in the variable GRUB_CMDLINE_LINUX_DEFAULT.
But this is only a partial fix because it selects a zero-brightness level at startup, and it also turns the brightness off when selecting the max level. This is an annoyance.
I discovered that this behavior is independent of Ubuntu, since something similar happened when I installed OpenSUSE in dual boot; and I also found similar posts that were related to different Lenovo laptops. My question is if this has to do with the Linux kernel, and/or if I have to update the drivers? If so, how can I fix this?
Let me know if I can provide more details to fix this. Thanks for helping out.
linux-kernel grub backlight
linux-kernel grub backlight
asked Oct 18 '15 at 20:06
DiegoDiego
1113
asked Oct 18 '15 at 20:06
DiegoDiego
1113
asked Oct 18 '15 at 20:06
DiegoDiego
1113
asked Oct 18 '15 at 20:06
DiegoDiego
1113
asked Oct 18 '15 at 20:06
DiegoDiego
1113
1113
add a comment |
add a comment |
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