On Wed, 29 Jun 2016, Alexey Kardashevskiy wrote: > On 29/06/16 18:31, Benjamin Herrenschmidt wrote: > > On Wed, 2016-06-29 at 18:29 +1000, Benjamin Herrenschmidt wrote: > >> On Wed, 2016-06-29 at 18:19 +1000, Alexey Kardashevskiy wrote: > >>> This is rather a bugreport than actual revert but nevertheless. > >>> > >>> Since 27a4c827c34a I started noticing weird traces and quite often > >>> I could not boot my test machine which is POWER8 box with AST video > >>> or ATI video (video adapter type does not matter much although > >>> is happens lot more often with the OpenPOWER machine which got > >>> AST). > >>> The system console is IPMI, not the actual video adapter. > >>> > >>> I bisected it to this: > >>> > >>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/com > >>> mi > >>> t/?id=27a4c827c34ac4256a190cc9d24607f953c1c459 > >>> > >>> For some reason which I do not understand, in > >>> cursor_timer_handler(), > >>> ops->cur_blink_jiffies is zero. Why can this happen? What is a > >>> proper > >>> fix? Thanks. > >> > >> Rings a bell... do you have fbcon: initialize blink interval before > >> calling fb_set_par (f235f664a8afabccf863a5dee4777d2d7b676fda) ? > > > > Also check if you have: > > > > "fbcon: set a default value to blink interval" > > (upstream ID a1e533ec07d583d01349ef13c0c965b8633e1b91). > > > Yes, both. The problem I see appears from v4.4 till the very recent > upstream kernel which I am debugging now and which is v4.7-rc5. Hi Alexey, Have you tried commit 1b45996d2ebf "tty: vt: Fix soft lockup in fbcon cursor blink timer." from the tty-linus branch of Greg's tty tree? Or if that doesn't work, then perhaps "fbcon: warn on invalid cursor blink intervals" from http://thread.gmane.org/gmane.linux.kernel.stable/178675/focus=2226587 ? Thanks, Scot -- To unsubscribe from this list: send the line "unsubscribe linux-fbdev" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
