[Bug 1026331] Re: `amixer set Master toggle` mutes but doesn't unmute
Same problem here with Xubuntu 12.10. Interestingly issuing the command amixer set Master 3+ does not unmute the sound, while playing with volume horizontal scroller does unmute. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1026331 Title: `amixer set Master toggle` mutes but doesn't unmute To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-utils/+bug/1026331/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 868208] Re: Changing screen back-light freezes thinkpad t420
** Summary changed: - Changing screen back-light freezes the laptop + Changing screen back-light freezes thinkpad t420 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/868208 Title: Changing screen back-light freezes thinkpad t420 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/868208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 868208] Re: Changing screen back-light freezes thinkpad t420
** Description changed: I have installed Ubuntu 11.04 on a new Lenovo T420 laptop (Core i7, NVIDIA NVS 4200M Graphics with Optimus) and I'm observing strange behaviors most notably, changing backlight causes the laptop to freeze. Also, running on battery is not possible since if I unplug the power, Ubuntu freezes. I'm guessing this is an ACPI issue but haven't still figured out what is wrong. thinkpad_acpi is loaded automatically. Boot- time crashes are also very commonplace. - Update: I noticed the following thinkpad_acpi output upon loading the + Update1: I noticed the following thinkpad_acpi output upon loading the module: thinkpad_acpi: detected a 8-level brightness capable ThinkPad + Which is wrong. Maybe thinkpad_acpi is not properly detecting hardware's version and falling back to the legacy mode. - Which is wrong. Maybe thinkpad_acpi is not properly detecting hardware's - version and falling back to the legacy mode. + Update2: I disabled UEFI in firmware control panel and set the boot + method to legacy mode only (BIOS) and the problem went away. I believe + this is due to buggy implementation of ACPI by UEFI in those machines. + Occasional freezes also went away. The only thing that is not working + now is back-light keys. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/868208 Title: Changing screen back-light freezes thinkpad t420 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/868208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 868208] Re: Changing screen back-light freezes thinkpad t420
** Description changed: I have installed Ubuntu 11.04 on a new Lenovo T420 laptop (Core i7, NVIDIA NVS 4200M Graphics with Optimus) and I'm observing strange behaviors most notably, changing backlight causes the laptop to freeze. Also, running on battery is not possible since if I unplug the power, Ubuntu freezes. I'm guessing this is an ACPI issue but haven't still figured out what is wrong. thinkpad_acpi is loaded automatically. Boot- time crashes are also very commonplace. Update1: I noticed the following thinkpad_acpi output upon loading the module: thinkpad_acpi: detected a 8-level brightness capable ThinkPad Which is wrong. Maybe thinkpad_acpi is not properly detecting hardware's version and falling back to the legacy mode. - Update2: I disabled UEFI in firmware control panel and set the boot - method to legacy mode only (BIOS) and the problem went away. I believe - this is due to buggy implementation of ACPI by UEFI in those machines. - Occasional freezes also went away. The only thing that is not working - now is back-light keys. + Update2: I disabled UEFI in firmware control panel and set the boot method to legacy mode only (BIOS) and the problem went away. I believe this is due to buggy implementation of ACPI by UEFI in those machines. Occasional freezes also went away. The only thing that is not working now is back-light keys. + At this point it seems this is not an Ubuntu related bug rather a bug in the firmware. ** Changed in: ubuntu Status: New = Opinion -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/868208 Title: Changing screen back-light freezes thinkpad t420 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/868208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 868208] [NEW] Changing screen back-light freezes the laptop
Public bug reported: I have installed Ubuntu 11.04 on a new Lenovo T420 laptop (Core i7, NVIDIA NVS 4200M Graphics with Optimus) and I'm observing strange behaviors most notably, changing backlight causes the laptop to freeze. Also, running on battery is not possible since if I unplug the power, Ubuntu freezes. I'm guessing this is an ACPI issue but haven't still figured out what is wrong. thinkpad_acpi is loaded automatically. Boot- time crashes are also very commonplace. ** Affects: ubuntu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/868208 Title: Changing screen back-light freezes the laptop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/868208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 868208] Re: Changing screen back-light freezes the laptop
** Description changed: I have installed Ubuntu 11.04 on a new Lenovo T420 laptop (Core i7, NVIDIA NVS 4200M Graphics with Optimus) and I'm observing strange behaviors most notably, changing backlight causes the laptop to freeze. Also, running on battery is not possible since if I unplug the power, Ubuntu freezes. I'm guessing this is an ACPI issue but haven't still figured out what is wrong. thinkpad_acpi is loaded automatically. Boot- time crashes are also very commonplace. + + Update: I noticed the following thinkpad_acpi output upon loading the + module: + + thinkpad_acpi: detected a 8-level brightness capable ThinkPad + + Which is wrong. Maybe thinkpad_acpi is not properly detecting hardware's + version and falling back to the legacy mode. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/868208 Title: Changing screen back-light freezes the laptop To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/868208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 226894] Re: Backlight control does not work on MacBook Pro 3.1
MacBook Pro v.3 (Santa Rosa) running Ubuntu 8.10 , kernel 2.6.27-11-generic , has problems with backlight. The module mbp_nvidia_bl does not load by default. Loading the module manually and writing the desired back-light value (a number between 1 to 15) to /sys/class/backlight/mbp_backlight/brightness solves the problem. (You need to sudo -i ) Note that when you connect the laptop to power, the back-light goes back to the default value (i guess 15) , in which case you have to set it to 15 and then set it to your desired value the way I mentioned above. -- Backlight control does not work on MacBook Pro 3.1 https://bugs.launchpad.net/bugs/226894 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
