From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexey Kardashevskiy <aik@ozlabs.ru>
Date: Wed, 29 Jun 2016 12:00:41 +0000
Subject: Re: [RFC PATCH kernel] Revert "fbcon: use the cursor blink interval provided by vt"
Message-Id: <5d6aaf79-89bc-a752-9ac5-78a763eebdda@ozlabs.ru>
List-Id: <linux-fbdev.vger.kernel.org>
References: <1467188352-5580-1-git-send-email-aik@ozlabs.ru>
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To: linux-fbdev@vger.kernel.org

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'a4c827c34ac4256a190cc9d24607f953c1c459
>>>
>>> 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.


-- 
Alexey