The bug still exists in Ubuntu 14.04 LTS and 16.04 LTS. As proposed in
comment #76 I filed a new bug report as bug #1687910.
** Tags added: trusty xenial
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Under Fedora I use the kernel parameter of nox2apic
Perhaps there is a similar one for Debian.
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https://bugs.launchpad.net/bugs/776999
Title:
[Lenovo W520] laptop freezes
This problem still Presist in Ubuntu 14.04 (fully updated as of today).
I have Lenovo W520 running Ubuntu 14.04 and NVIDIA Corporation GF108GLM
[Quadro 1000M]. Anything that tries to change brightness can freeze the
system, but only if running in Discrete Graphics Mode (in BIOS). I need
Discrete
I case anyone runs into this later in time:
I just got W520 and moved my Trusty installation from T520. Had various
issues, mostly explained above. Upgraded to nvidia-352, upgraded to
linux-image-generic-lts-wily (linux 4.2.0), problems persisted.
Then I just disabled VT-d in BIOS, and all the
Had problem on Lenovo W520 with Kubuntu 14.04 to get external VGA AND LVDS
working.
With Optimus no chance.
Had to switch to discrete graphics in Bios.
Nvidia drivers nogo.
Switched to Nouveau i.e. reinstalled the driver.
But than had problem with brightness on LVDS.
Finally figured out working
Please reopen. This happens to me for Ubuntu 14.04 on a Lenovo T530 with
nvidia drivers. It only happens when I switch to Discrete Graphics in
the BIOS, but running in Optimus breaks other things (cannot change the
virtual layout of external screens without glitches).
Using all the proposed
This is what happens when I tried echo 5 sudo tee
/sys/class/backlight/acpi_video0/brightness. It instantly froze
everything except the mouse pointer, which froze after about 10 seconds
as well. You can see lots of erros in the log file.
** Attachment added: Xorg.0.log.old
Please reopen. Same issues for me on Ubuntu 12.04 64 bit. Frequent lockups
during boot, cannot resume, locks up when brightness changed.
T520 + NVidia 4200M
32 bit install of Ubuntu 12.04 is solid, 64 bit install of Ubuntu 12.04 is
unusable
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I'm also affected. Ubuntu 13.10 64 bit. Freezes between GRUB and login
if I set graphics to discrete card.
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https://bugs.launchpad.net/bugs/776999
Title:
[Lenovo W520]
Sorry, forgot to say this is on a Lenovo T520 with Intel HD3000 + Nvidia
4200M
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https://bugs.launchpad.net/bugs/776999
Title:
[Lenovo W520] laptop freezes on ACPI-related
Same here, ubuntu 13.04 64 bit, brightness changed by fn+up/down and the
system freezes.
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https://bugs.launchpad.net/bugs/776999
Title:
[Lenovo W520] laptop freezes on
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