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Old 11-25-2011, 06:02 PM
Michał Piotr Gawron
Default Same on T520 (was: Application stability problems (kernel 3.1, Intel hardware))

I have identical symptoms after my recent upgrade, so I thought that
I add my observations.

I bought Lenovo T520 (90% intel based devices) and was migrating
everything from old R61. I installed core version of newest Arch, setup
ssh session between two notebooks and wanted to copy HDD contents, as I
always did when I switched notebooks. But I couldn't due to constant ssh
connection problems. I tried turning off various TCP offloads with
ethtool, but it didn't help. I ended up copying the data via the
external HDD.

As there was no X running on those computers, I don't thing that the
network problems are X server related.

But there are also those:
* Firefox random crashes. After a reboot it runs for 10…15 minutes and
then starts crashing like hell. HW acceleration disabled, no Flash
plugin, but still crashing. GDB stacktrace shows segfaults in
/usr/lib/firefox/libxul.so preceeded by a couple of calls in libpng.
* There were problems with Flash alone, too, but I worked around them
1. disabling "Hardware acceleration" in right-click Flash config,
2. exporting VDPAU_NVIDIA_NO_OVERLAY=1 in /etc/profile, so the whole
X sees it).
When Fx is not crashing, Flash works well.
* Mouse cursor jumping to the top, left or top-left corner. Clicking
on any button fixes the problem, but it keeps recurring very quickly.
* X crashes. Usually when Firefox starts crashing, the problem with
mouse occures and X crashes, leaving me with KDM. Fx and mouse
problems return quickly even if I restart X (the kdm daemon), so it
might be a problem with kernel rather than X.

My desktop environment is KDE 4.7.3.

What I tried until now:
* Two graphics cards: integrated Intel and Nvidia NVM 4200M, with and
without acceleration, with and without compositing). Couldn't test
Nouveau, as it says that my chipset is not supported.
* Disabling touchpad in BIOS.
* Updating to 3.1.2 kernel yesterday.
* Slowing down all cores to 800Mhz (like it was thermal problem).
Neither of the above helped for any of the problems.

Since Ciprian was using i3wm, which is very different from KDE, I
wouldn't blame DE for these problems.

I have Windows 7 on this notebook, too, and everything works fine there.

I didn't test custom built kernel, but I'm going to do this now.

Michał Gawron

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