For a while now my desktop pc experiences boot issues. I try to boot and after grub the screen just goes in standby mode and sometimes it reboots and sometimes just nothing happens. After a few tries it usually succeeds in booting. So I bisected the kernel and this is the first bad commit: 6c7bccea390853bdec5b76fe31fc50f3b36f75d5 Steps to reproduce: not sure, seems to be a rare bug. install a linux kernel newer than 3.13 and boot Hardware: AMD Phenom X4 955 AMD 5770 (Evergreen, Juniper) I tried to get a log from systemd (journalctl --boot=-1) but there is none for the failed boot attempt.
Please attach your dmesg output with radeon.dpm=1 on the kernel command line in grub.
Created attachment 173691 [details] dmesg output dmesg output with radeon.dpm=1 (in this case the pc managed to boot to linux, as mentioned there is no log when it fails, or is journalctl --boot=-1 the wrong way to get the previous log? (systemd))
bug is only present with radeon.dpm=1 (default?), with radeon.dpm=0 there are no issues
forcing dpm=1 enables additional debugging output not present when the parameter is not explicitly set.
is there anything else I can provide? logs, try some modified kernels etc?
seems to be fixed in newer kernels