On Thu, Jul 17, 2014 at 10:31:30PM +0200, Jan Niggemann wrote: > Hi list, > > you were very helpful to nail down the interrupt storm issue a year ago, I > hope we can track this down, too. > I'm experiencing an issue with 3.15.5 on my Lenovo T400: > When my machine boots, I can see some of the boot messages flying by (quite > fast because the machine has a SSD). > On a usual boot, the screen would go blank with the backlight off, come back > on and other boot messages are visible in a different resolution. Finally > the screen flickers once and shows the GDM login. > Since 3.15 (or 3.14, can't say for sure), the boot starts normally, but the > first mode change doesn't occur, resulting in a black screen with backlight > on. The system is entirely unresponsive and I can only press the power > button until to switch it off. > > This happens with my custom built kernel 3.15.5 but not with the Debian > standard kernel 3.2.0 and IIRC neither with my custom built 3.14 kernels. > > Would a drm debug log help and if so, what kernel parameters should I use to > generate it? Your box seems to die in the initial modeset, which is done with the console_lock held. Which means any crashdumps in dmesg won't get out to netconsole or anything else unfortunately. I think the only way to move forward here is to double-check that 3.14 works and 3.15 is broken by recompiling with the same .config (occasionally config changes cause regressions). And then do a full git bisect to find the offending commit. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
