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 |
1 Answer
1
active
oldest
votes
I have a Lenovo ideapad P500 as well. I haven't found a fix. I have to reboot and literally set the backlight before it boots past EFI. I do not have enough of an understanding on the issue to investigate further.
I am surprised NOBODY has come up with an answer anywhere and google searches turn up nothing. It has something to do with the EFI not communicating properly to the OS/drivers. Some of my research has indicated even Windows is affected as well. Perhaps an EFI update would help? But fat chance in today's world because nobody seems to care about supporting their hardware after it hits the shelves.
answered 1 hour ago
JesseJesse
1
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f237036%2fbacklight-control-configuration-misbehaves-on-an-ideapad%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I have a Lenovo ideapad P500 as well. I haven't found a fix. I have to reboot and literally set the backlight before it boots past EFI. I do not have enough of an understanding on the issue to investigate further.
I am surprised NOBODY has come up with an answer anywhere and google searches turn up nothing. It has something to do with the EFI not communicating properly to the OS/drivers. Some of my research has indicated even Windows is affected as well. Perhaps an EFI update would help? But fat chance in today's world because nobody seems to care about supporting their hardware after it hits the shelves.
answered 1 hour ago
JesseJesse
1
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a Lenovo ideapad P500 as well. I haven't found a fix. I have to reboot and literally set the backlight before it boots past EFI. I do not have enough of an understanding on the issue to investigate further.
I am surprised NOBODY has come up with an answer anywhere and google searches turn up nothing. It has something to do with the EFI not communicating properly to the OS/drivers. Some of my research has indicated even Windows is affected as well. Perhaps an EFI update would help? But fat chance in today's world because nobody seems to care about supporting their hardware after it hits the shelves.
answered 1 hour ago
JesseJesse
1
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I have a Lenovo ideapad P500 as well. I haven't found a fix. I have to reboot and literally set the backlight before it boots past EFI. I do not have enough of an understanding on the issue to investigate further.
I am surprised NOBODY has come up with an answer anywhere and google searches turn up nothing. It has something to do with the EFI not communicating properly to the OS/drivers. Some of my research has indicated even Windows is affected as well. Perhaps an EFI update would help? But fat chance in today's world because nobody seems to care about supporting their hardware after it hits the shelves.
answered 1 hour ago
JesseJesse
1
New contributor
Jesse 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 Lenovo ideapad P500 as well. I haven't found a fix. I have to reboot and literally set the backlight before it boots past EFI. I do not have enough of an understanding on the issue to investigate further.
I am surprised NOBODY has come up with an answer anywhere and google searches turn up nothing. It has something to do with the EFI not communicating properly to the OS/drivers. Some of my research has indicated even Windows is affected as well. Perhaps an EFI update would help? But fat chance in today's world because nobody seems to care about supporting their hardware after it hits the shelves.
answered 1 hour ago
JesseJesse
1
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
JesseJesse
1
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 1 hour ago
JesseJesse
1
answered 1 hour ago
JesseJesse
1
1
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Jesse is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
Thanks for contributing an answer to Unix & Linux Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f237036%2fbacklight-control-configuration-misbehaves-on-an-ideapad%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
