Created attachment 951403 [details] journalctl -b -1 output On Fedora 20, with the Linux kernels 3.16.4 and further, my system hangs on the GDM login screen in a few seconds (usually I click on my name and everything collaps...). Everything was working fine from kernel 3.14 to kernel 3.16.3. My laptop is a Dell Vostro 3300 which has Intel/nVidia hybrid graphics (but not optimus I think): 00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 18) 01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [GeForce 310M] (rev a2) Below are some of the errors I could gather using the command `journalctl -b -1` (more details in the attachment journalctl.log): ... BUG: unable to handle kernel NULL pointer dereference kernel: nouveau E[ PFB][0000:01:00.0] trapped write at 0x002001a034 on channel 0x0001fb24 ... IP: [<ffffffffa0280985>] nv84_fence_read+0x25/0x30 [nouveau] ... RIP [<ffffffffa0280985>] nv84_fence_read+0x25/0x30 [nouveau] I'll try to bisect the kernel if I remember how to do it and I'll test more upstream kernels from Koji. Thanks for your help on this matter, Rémi.
Created attachment 951564 [details] ouput of "git bisect log" I did a bisection and I might have found the first bad commit: a4c5f39c22082dd53a95e2c63aa3d4ed9805fad4 is the first bad commit commit a4c5f39c22082dd53a95e2c63aa3d4ed9805fad4 Author: Bjorn Helgaas <bhelgaas> Date: Wed Sep 10 13:45:01 2014 -0600 PCI: Add pci_ignore_hotplug() to ignore hotplug events for a device Hope that helps, Rémi.
Same issue on kernel 3.17.1 (and hence on Fedora 21).
Created attachment 960288 [details] kernel 3.18.0-rc4 logs Problem still exists on kernel 3.18.0-rc4 unfortunately.
A workaround to boot on kernel 3.16.4 and further is to add the boot parameter "nouveau.runpm=0". It is then possible to install Fedora 21 but the laptop is heating again and the battery life is shrinking... There are two options to disable the discrete nVidia card: 1) Install Bumblebee/bbswitch (which hasn't worked for me) 2) Install the latest working kernel which can luckily be found on Koji: https://koji.fedoraproject.org/koji/buildinfo?buildID=581187
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