Hi All, Came across this when hunting random freezes / crashes on Acer B115 laptop. It started with upgrade to ubuntu 15.04 (14.x worked ok, haven't noted the kernel versions).
http://ubuntuforums.org/showthread.php?t=2284615&p=13313066#post13313066 My original post in here. OpenSuSE with kernel 4.0.5 seemed to run fine, but it might be that I looked it at the wrong end, because 15.04 ubuntu crashed only when going to sleep so that is the thing I tried to track down. 15.10 now crashes randomly during desktop use - and same happens in OpenSuSE Tumbleweed with 4.3 kernel. Crashes seem intermittent, might make days without freeze and then couple of nights back two freezes in a row, second one just couple of minutes after reboot. Only load was chromium showing couple of large web pages when crashes happened. Symptons are quite same described in many posts, no sysrq possible, only power off works. I did already try intel_pstate=disable and that made the system freeze on screensaver after just few minutes of uptime. After that I've booted with debugging options enabled and fiddled a bit with clock frequency setting, and haven't managed to crash since - but I'm still only three days up. Tried to make it crash by playing couple of games and/or HD videos, no luck so far. But this is to be expected, 15.10 ubuntu could also run couple of weeks - which makes this painful as there seems to be no clear way of reproducing the issue. Just it makes me think that is there something going on with timings at hardware level? What I did try was to lower the frequency setting just lightly, with quick testing it didn't seem to matter how much I touched it. Also I'm a bit puzzled about the setting, is the /sys/kernel/debug/dri/0/i915_max_freq value in MHz or something else, as in log it says: [26873.155419] [drm:valleyview_enable_rps] current GPU freq: 312 MHz (198) [26873.155420] [drm:valleyview_enable_rps] setting GPU freq to 645 MHz (214) And I think I saw this high values in log, even if I did set the frequency value to less than 400. Anyway, I'll update if I found anything else, this is annoying as it has been going on months now without a clear clue what is wrong with this laptop :) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-intel in Ubuntu. https://bugs.launchpad.net/bugs/1453298 Title: 8086:0f31 Xubuntu freeze once a day To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1453298/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
